ACDS V10.0 - Detailed Description of J/A+A/588/A103

ACDS V10.0 - Mon Feb 03 17:08:19 CET 2025

| # Detailed Description of J/A+A/588/A103 : Second ROSAT all-sky survey (2RXS) source catalog (Boller+, 2016) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/A+A/588/A103 Second ROSAT all-sky survey (2RXS) source catalog (Boller+, 2016)
    ================================================================================
    Second ROSAT all-sky survey (2RXS) source catalogue.
        Boller T., Freyberg M.J., Truemper J., Haberl F., Voges W., Nandra K.
        <Astron. Astrophys. 588, A103 (2016)>
        =2016A&A...588A.103B        (SIMBAD/NED BibCode)
    ================================================================================
    ADC_Keywords: X-ray sources ; Surveys

    Mission_Name: ROSAT

    Keywords: X-rays: catalogs

    Abstract:
        We present the second ROSAT all-sky survey source catalogue, hereafter
        referred to as the 2RXS catalogue. This is the second publicly
        released ROSAT catalogue of point-like sources obtained from the ROSAT
        all-sky survey (RASS) observations performed with the
        position-sensitive proportional counter (PSPC) between June 1990 and
        August 1991, and is an extended and revised version of the bright and
        faint source catalogues.

        We used the latest version of the RASS processing to produce
        overlapping X-ray images of 6.4 by 6.4 degrees sky regions. To create
        a source catalogue, a likelihood-based detection algorithm was applied
        to these, which accounts for the variable point-spread function (PSF)
        across the PSPC field of view. Improvements in the background
        determination compared to 1RXS were also implemented. X-ray control
        images showing the source and background extraction regions were
        generated, which were visually inspected. Simulations were performed
        to assess the spurious source content of the 2RXS catalogue. X-ray
        spectra and light curves were extracted for the 2RXS sources, with
        spectral and variability parameters derived from these products. We
        obtained about 135,000 X-ray detections in the 0.1-2.4keV energy band
        down to a likelihood threshold of 6.5, as adopted in the 1RXS faint
        source catalogue. Our simulations show that the expected spurious
        content of the catalogue is a strong function of detection likelihood,
        and the full catalogue is expected to contain about 30 per cent
        spurious detections. A more conservative likelihood threshold of 9, on
        the other hand, yields about 71,000 detections with a 5 per cent
        spurious fraction.

        We recommend thresholds appropriate to the scientific application.
        X-ray images and overlaid X-ray contour lines provide an additional
        user product to evaluate the detections visually, and we performed our
        own visual inspections to flag uncertain detections. Intra-day
        variability in the X-ray light curves was quantified based on the
        normalised excess variance and a maximum amplitude variability
        analysis. X-ray spectral fits were performed using three basic models,
        a power law, a thermal plasma emission model, and black-body emission.
        Thirty-two large extended regions with diffuse emission and embedded
        point sources were identified and excluded from the present analysis.

        The 2RXS catalogue provides the deepest and cleanest X-ray all-sky
        survey catalogue in advance of eROSITA.

    Description:
        We have re-analysed the photon event files from the ROSAT all-sky
        survey. The main goal was to create a catalogue of point-like sources,
        which is referred to as the 2RXS source catalogue. We improved the
        reliability of detections by an advanced detection algorithm and a
        complete screening process. New data products were created to allow
        timing and spectral analysis. Photon event files with corrected
        astrometry and Moon rejection (RASS-3.1 processing) were made
        available in FITS format. The 2RXS catalogue will serve as the basic
        X-ray all-sky survey catalogue until eROSITA data become available.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × cat2rxs.dat     2696   135118   Catalogue of 135118 2RXS ROSAT sources
    × cat2rxs.fits    2880    77858   Fits version of the catalog
    × Ximg/*             0   135118   X images in pdf
    × lcx/*              0   333063   X-ray light curves in pdf
                                     (3 files for 111021 sources)
    × spx/*              0    29388   X-ray spectra in pdf (3 files for 9796 sources)

    See also:
     IX/10   : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
     IX/29   : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
     IX/28   : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)
     IX/30   : Second ROSAT PSPC Catalog (2RXP) (ROSAT, 2000)
     IX/46   : XMM-Newton Serendipitous Source Catalogue 3XMM-DR5 (XMM-SSC, 2016)
     IX/43   : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)
     III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
     VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (VV10) (Veron+ 2001)
     I/259   : The Tycho-2 Catalogue (Hog+ 2000)
     V/50    : Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)
     V/106   : Catalogue of X-ray binaries (HMXB) (Liu+ 2001)

     J/A+A/455/1165 : Galactic high-mass X-ray binaries (LMXB) (Liu+ 2006)
     J/A+A/480/611  : XMM-Newton Slew Survey catalogue, XMMSL1 (Saxton+, 2008)
     J/A+A/403/247  : Variability in ROSAT All-Sky Survey (FUH) (Fuhrmeister+, 2003)
     J/A+A/316/147  : Catalogue of ROSAT White Dwarfs (Fleming+ 1996)

      http://www.atnf.csiro.au/people/pulsar/psrcat : ATNF Home page
      http://www.sdss.org : SDSS Home page

    Byte-by-byte Description of file:  cat2rxs.dat

       Bytes Format Units       Label     Explanations

       1- 21  A21   ---         2RXS      IAU name (IAU_NAME) (1)
      23- 28  I6    ---         Seq       ? Sky field number (SEQ_ID)
      30- 32  I03   ---         IndDet    ? Source number in a certain sky field
                                             (IND_DET)
      34- 42  F9.2  ---         ExiML     Detection likelihood (EXI_ML)
      44- 52  F9.2  ct          Cts       Background corrected source counts (CTS)
      54- 63  F10.6 ct          e_Cts     Error of the source counts (CERR)
      65- 72  F8.4  ct/s        CRate     Source count rate (RATE)
      74- 80  F7.4  ct/s        e_CRate   Error of the count rate (ERATE)
      82- 89  F8.2  s           ExpTime   Source exposure time (EXPOSURE)
      91- 99  F9.5  deg         RAdeg     Right ascension (J2000) (RA_DEG)
     101-109  F9.5  deg         DEdeg     Declination (J2000) (DEC_DEG)
     111-122  A12   ---         RAhms     Sexadecimal right ascension (J2000)
                                             (RA_HMS)
     124-135  A12   ---         DEdms     Sexadecimal declination (J2000)
                                             (DEC_DMS)
     137-145  F9.5  deg         GLON      Latitude in galactic coordinate  (LII)
     147-155  F9.5  deg         GLAT      Longitude in galactic coordinate (BII)
     157-165  F9.5  deg         Lambda    Latitude in ecliptic coordinate (LAMBDA)
     167-175  F9.5  deg         Beta      Longitude in ecliptic coordinate (BETA)
     177-185  F9.3  pix         Ext       Source extent in units of image pixels
                                             (EXT)
     187-193  F7.3  pix         e_Ext     Error of the source extent (EXTERR)
     195-201  F7.2  ---         ExtML     Proability of the source extend (EXT_ML)
     203-208  F6.3  ---         HR1       ? Hardness ratio 1 value (HR_1) (2)
     210-217  F8.3  ---         e_HR1     ? Error of HR1 (HR1err)
     219-224  F6.3  ---         HR2       ? Hardness ratio 2 value (HR_2) (2)
     226-234  F9.3  ---         e_HR2     ? Error of HR2 (HR2err)
         236  I1    ---         USKY      ? Unique flag (USKY) (3)
         238  I1    ---         Masked    [1]? Extended emission regions
                                             (0=yes 1=no) (Masked)
         240  I1    ---         FAll      [0]? Detection flag of nearby sources
                                             (FLAG_all) 0=best
     242-244  I3    ---         Sflag     ? S flag (0=good) (S_flag) (4)
     246-248  I3    ---         Index     ? Running number in catalogue (INDEX)
     250-258  F9.4  ---         AmpMax    ? Maximum amplitude variability
                                             (AMPL_MAX)
     260-268  F9.5  ct/s        CM        ? Mean count rate value (CM)
     270-278  F9.5  ct/s        CD        ? Standard deviation of CM (CD)
     280-288  F9.2  ct          CTSlc     ? Number of counts calculated from the
                                             light curve analysis (CTS_lc)
     290-298  F9.5  ct/s        Cmin      ? Minimum count rate ( CMIN)
     300-308  F9.5  ct/s        Cmax      ? Maximum count rate ( CMAX)
     310-318  F9.5  ct/s        e_Cmin    ? Error of CMIN (EMIN)
     320-328  F9.5  ct/s        e_Cmax    ? Error of CMAX (EMAX)
     330-338  F9.3  ---         Chi2lc    ? Chi2 value from the LC analysis
                                             (CHI2_lc)
     340-351  E12.6 ---         ExcVar    ? Normalized excess variance
                                             (EXCESS_VAR)
     353-364  E12.6 ---         e_ExcVar  ? One-sigma uncertainty of Exc_Var
                                             (UNCERTAINTY)
     366-375  F10.6 ---         sigExc    ? Excess variance in units of sigma
                                             (Sigma_Excess)
     377-385  F9.4  10+21cm-2   NHgal     ? Galactic neutral hydrogen density
                                             (NH_gal)
     387-395  F9.4  10+21cm-2   NHfitp    ? neutral hydrogen density of PL fits
                                             (NHfitp)
     397-408  E12.6 10+21cm-2   e_NHfitp  ? Error of NHfitp (NHerrp)
     410-419  E10.5 ---         Normp     ? Normalization for PL fits (NORM_p)
     421-430  E10.5 ---         e_Normp   ? Error of NORM_p  (NORMerrp)
     432-438  F7.4  ---         Gammap    ? Photon index (GAMMA_p)
     440-451  E12.6 ---         e_Gammap  ? Error of GAMMA_p (GAMMAerrp)
     453-461  F9.6  ct/s        CTRspep   ? Count rate obtained from the PL fit
                                             (CTRspecp)
     463-472  E10.5 mW/m2       Fluxp     ? Absorption corrected flux of PL-fit
                                             (FLUX_p)
     474-482  F9.4  ---         Chi2rspp  ? Reduced chi^2 value for the PL-fits
                                             (Chi2redspecp)
     484-492  F9.4  ---         Chi2spp   ? Chi^2 value for the  power-law-fits
                                             (Chi2specp)
     494-496  I3    ---         NDptp     ? Number of data points for the PL-fits
                                             (NumDatapts_p)
     498-501  I4    ---         NDFp      ? Number of degrees of freedom (PL)
                                             (NumDegfree_p)
     503-513  F11.6 10+21cm-2   NHfitm    ? Neutral hydrogen density (mekal fits)
                                             (NHfitm)
     515-524  E10.5 10+21cm-2   e_NHfitm  ? Error of NHfitm (NHerrm)
     526-535  E10.5 ---         Normm     ? Normalization for the mekal fits
                                             (NORM_m)
     537-546  E10.5 ---         e_Normm   ? Error of NORM_m (NORMerrm)
     548-556  F9.6  ---         Tempfitm  ? Temperature of the mekal fits
                                             (Tempfitm)
     558-567  E10.5 ---       e_Tempfitm  ? Error of Tempfitm (Temperrm)
     569-577  F9.6  ct/s        CTRspm    ? Count rate obtained for the mekal fits
                                             (CTRspecm)
     579-587  F9.6  mW/m2       Fluxm     ? Absorption corrected flux (mekal fits)
                                             (FLUX_m)
     589-598  E10.5 ---         Chi2rspm  ? Reduced chi^2 value for mekal fits
                                             (Chi2redspecm)
     600-609  E10.5 ---         Chi2spm   ? Chi^2 value for the  mekal fits
                                             (Chi2specm)
     611-613  I3    ---         NDptm     ? Number of data points (mekal fits)
                                             (NumDatapts_m)
     615-618  I4    ---         NDFm      ? Number of degrees of freedom (mekal)
                                             (NumDegfree_m)
     620-629  F10.5 10+21cm-2   NHfitb    ? Neutral hydrogen density (bbdy fits)
                                             (NHfitb)
     631-640  E10.5 10+21cm-2   e_NHfitb  ? Error of NHfitb (NHerrb)
     642-651  E10.5 ---         Normb     ? Normalization for the black body fits
                                             (NORM_b)
     653-662  E10.5 ---         e_Normb   ? Error of the normalization (bbdy fits)
                                             (NORMerrb)
     664-673  F10.6 ---         Tempfitb  ? Temperature of the black body fits
                                             (Tempfitb)
     675-684  E10.5 ---       e_Tempfitb  ? Error of Tempfitbbdy (Temperrb)
     686-694  F9.6  ct/s        CTRspb    ? Count rate for the black body fit
                                             (CTRspecb)
     696-705  E10.5 mW/m2       Fluxb     ? Absorption corrected flux (black body)
                                             (FLUX_b)
     707-716  E10.5 ---         Chi2rspb  ? Reduced chi2 value (black body)
                                             (Chi2redspecb)
     718-727  E10.5 ---         Chi2spb   ? Chi2 value for the black body fits
                                             (Chi2specb)
     729-731  I3    ---         NDptb     ? Number of data points (black body)
                                             (NumDatapts_b)
     733-736  I4    ---         NDFb      ? Number of degrees of freedom (bbdy)
                                             (NumDegfree_b)
     738-745  F8.4  pix         Xima      X image coordinate (45 arcsec)
                                             in image pixel (X_IMA)
     747-754  F8.4  pix         Yima      Y image coordinate (45 arcsec)
                                             in image pixel (Y_IMA)
     756-763  F8.6  pix         e_Xima    One-sigma error of X_IMA
                                             in image pixel (XERR)
     765-772  F8.6  pix         e_Yima    One-sigma error of Y_IMA
                                             in image pixel (YERR)
     774-782  F9.2  pix         Xsky      X sky coordinates (0.5 arcsec)
                                             in sky pixel (X_SKY)
     784-792  F9.2  pix         Ysky      Y sky coordinates (0.5 arcsec)
                                             in sky pixel (Y_SKY)
     794-796  I3    pix         CuRad     [600]? Source extraction radius
                                             in sky pixels (CUT_RAD)
     798-800  F3.1  ---         FA        Analyzed fraction of cut radius (FA)
     802-805  I4    ---         TotNum    ? Total number of photons read from the
                                             PET and analyzed by the maximum
                                             likelihood  algorithm (TOTNUM)
     807-813  F7.4  pix-1       BGR       Background in source extraction region
                                             in 1/pix_image (BGR)
     815-821  F7.4  ---         VigCor    Vignetting correction factor (VIG_COR)
     823-834  A12   ---         Rem       [source nrby?] on flags originating from
                                             ML-detection (REMARKS)
     836-843  F8.2  ct          SB1       ? Counts in band A (SB1)
     845-852  F8.2  ct          SB2       ? Counts in band B (SB2)
     854-861  F8.2  ct          SB3       ? Counts in band C (SB3)
     863-870  F8.2  ct          SB4       ? Counts in band D (SB4)
     872-879  F8.2  ct          B1        ? Background band A with other catalogue
                                             entries excised (B1)
     881-888  F8.2  ct          B2        ? Background band B with other catalogue
                                             entries excised (B2)
     890-897  F8.2  ct          B3        ? Background band C with other catalogue
                                             entries excised (B3)
     899-906  F8.2  ct          B4        ? Background band D with other catalogue
                                             entries excised (B4)
     908-914  F7.3  arcmin+2    Bspa      ? Remaining bkg area in square arcmin
     916-923  F8.2  ct          S1        ? Source counts in band A
                                             (SB1 - B1*sbspa/bspa) (S1)
     925-932  F8.2  ct          S2        ? Source counts in band B
                                             (SB2 - B2*sbspa/bspa) (S2)
     934-941  F8.2  ct          S3        ? Source counts in band c
                                             (SB3 - B3*sbspa/bspa) (S3)
     943-950  F8.2  ct          S4        ? Source counts in band D
                                             (SB4 - B4*sbspa/bspa) (S4)
     952-953  I2    ---         mXMMSL1   ? Number of counterparts in the XMM Slew
                                             Survey within the distance of 60"
                                             (mult_xmmsl1)
     955-959  I5    ---         eXMMSL1   ? Source number of nearest counterpart
                                             in the XMM Slew Survey (entr_xmmsl1)
     961-966  F6.1  arcsec      dXMMSL1   ?=0 Distance of nearest XMMSL1
                                             counterpart (dist_xmmsl1)
     968-976  F9.5  deg         RA1deg    XMMSL Right ascension (J2000)
                                             (RA_xmmsl1)
     978-986  F9.5  deg         DE1deg    XMMSL Declination (J2000) (DEC_xmmsl1)
     988-993  A6    ---         ---       [XMMSL1]
     995-1010  A16   ---         XMMSL1    Source name in the XMM Slew Survey
                                            (SRCNAME_xmmsl1)
     1012-1021  F10.6 ct/s        CRB0      ? Broad Band Count rate (RATEB0xmmsl1)
     1023-1031  F9.6  ct/s        e_CRB0    ? Broad Band Count rate error
                                             (RATEB0exmmsl1)
     1033-1042  F10.6 ct/s        CRB5      ? Count rate, energy band 0.5-2keV
                                             (RATEB5xmmsl1)
     1044-1052  F9.6  ct/s        e_CRB5    ? Count rate error, 0.5-2keV
                                             (RATEB5exmmsl1)
     1054-1056  I3    ---         m3XMM     ? Number of 3XMM counterparts within
                                             the distance of 60"(mult_3xmm)
     1058-1063  I6    ---         e3XMM     ? Source number of nearest counterpart
                                             in the 3XMM Catalogue (entr_3xmm)
     1065-1070  F6.1  arcsec      d3XMM     ?=0 Distance of nearest 3XMM counterpart
                                             (dist_3xmm)
     1072-1080  F9.5  deg         RA2deg    3XMM Right ascension (J2000) (RA_3xmm)
     1082-1090  F9.5  deg         DE2deg    3XMM Declination (J2000) (DEC_3xmm)
     1092-1095  A4    ---         ---       [3XMM]
     1097-1112  A16   ---         3XMM      Source name in the 3XMM Catalogue
                                             (SRCNAME_3xmm)
     1114-1125  E12.6 ct/s        CREP8     ? 3XMM Count rate (RATEEP83xmm)
     1127-1134  F8.6  ct/s        e_CREP8   ? 3XMM Count rate error (RATEEP8e3xmm)
     1136-1147  E12.6 mW/m2       FluxR     ? 3XMM Flux (FLUXR3xmm)
     1149-1160  E12.6 mW/m2       e_FluxR   ? 3XMM Flux error (FLUXRerr_3xmm)
     1162-1164  I3    ---         m2RXP     ? Number of 2RXP counterparts within
                                             the distance of 300" (mult_2rxp)
     1166-1170  I5    ---         e2RXP     ? Source number of nearest counterpart
                                             in the 2RXP catalogue (entr_2rxp)
     1172-1177  F6.1  arcsec      d2RXP     ?=0 Distance of 2RXP nearest counterpart
                                             (dist_2rxp)
     1179-1187  F9.5  deg         RA3deg    2RXP Right ascension (J2000) (RA_2rxp)
     1189-1197  F9.5  deg         DE3deg    2RXP Declination  (J2000) (DEC_2rxp)
     1199-1214  A16   ---         2RXP      Source name in the 2RXP (SRCNAME_2rxp)
     1216-1224  F9.6  ct/s        CR2RXP    ? 2RXP Count rate (CRATE_2rxp)
     1226-1233  F8.6  ct/s        e_CR2RXP  ? 2RXP Count rate error (CRATEerr2rxp)
     1235-1239  I5    s           ETim2RXP  ? 2RXP Source exposure time
                                             (ExpTime_2rxp) (132)
     1241-1255  A15   ---         ObsID     Field number of 2RXP counterpart
                                             (ObsID_2rxp) (133)
        1257  I1    ---         m1RXS     ? Number of 1RXS counterparts within a
                                             distance of 60" (mult_1rxs)
     1259-1264  I6    ---         e1RXS     ? Source number of nearest counterpart
                                             in the 1RXS catalogue (entr_1rxs)
     1266-1271  F6.1  arcsec      d1RXS     ?=0 Distance to nearest 1RXS counterpart
                                             (dist_1rxs) (136)
     1273-1281  F9.5  deg         RA4deg    1RXS Right ascension (J2000) (RA_1rxs)
     1283-1291  F9.5  deg         DE4deg    1RXS Declination (J2000) (DEC_1rxs)
     1293-1308  A16   ---         1RXS      Source name in the 1RXS catalogue
                                             (SRCNAME_1rxs)
     1310-1318  F9.6  ct/s        CR1RXS    ? Source count rate in the 1RXS
                                             (RATE_1rxs)
     1320-1327  F8.6  ct/s        e_CR1RXS  ? Error of RATE_1rxs (RATEerr1rxs)
     1329-1340  E12.6 ---         CTS1RXS   ? Background corrected src counts 1RXS
                                             (CTS_1rxs)
     1342-1351  F10.6 ---        e_CTS1RXS  ? Error of CTS_1rxs (CTSerr1rxs)
     1353-1356  I4    ---        ExiML1RXS  ? Background corrected src counts 1RXS
                                             (EXIML1rxs)
     1358-1362  I5    s          ExPos1RXS  ? Source exposure time in 1RXS
                                             (EXPOS_1rxs) (145)
     1364-1372  F9.6  ---         HR11RXS   ? 1RXS Hardness ratio 1 value
                                             (HR1_1rxs) (5)
     1374-1381  F8.6  ---        e_HR11RXS  ? Error of HR1 in the 1RXS (HR1e_1rxs)
     1383-1391  F9.6  ---         HR21RXS   ? 1RXS Hardness ratio 2 value
                                             (HR2_1rxs) (5)
     1393-1400  F8.6  ---        e_HR21RXS  ? Error of HR2 in the 1RXS (HR2e_1rxs)
     1402-1403  I2    ---         mVV10     ? Number of counterparts in the Veron
                                             and Verson Catalogue within the
                                             distance of 60" (mult_vv10)
     1405-1410  I6    ---         eVV10     ? Source number of VV10 nearest
                                             counterpart (entr_vv10)
     1412-1417  F6.1  arcsec      dVV10     ?=0 Distance to nearest VV10 counterpart
                                             (dist_vv10)
     1419-1435  A17   ---         VV10      VV10 Catalogue name (NAME_vv10)
        1437  A1    ---         TypeVV10  [B/A/Q] VV10 Object type (Type_vv10)
     1439-1444  F6.3  mag         VmagVV10  ? VV10 V magnitude (Vmag_vv10)
     1446-1450  F5.3  ---         zVV10     ? VV10 Redshift (z_vv10)
     1452-1457  I6    ---        IndexVV10  ? VV10 Running catalogue number
                                             (Index_vv10) (157)
     1459-1467  F9.5  deg         RA5deg    VV10 Right ascension (J2000) (RA_vv10)
     1469-1477  F9.5  deg         DE5deg    VV10 Declination (J2000) (DEC_vv10)
     1479-1480  I2    ---         mTYC2     ? Number of the nearest counterpart in
                                             the Tycho2 Catalogue (mult_tyc2)
     1482-1488  I7    ---         eTYC2     ? Source number of nearest Tyc2
                                             counterpart (entr_tyc2)
     1490-1495  F6.1  arcsec      dTYC2     ?=0 Distance to nearest Tyc2 counterpart
                                             (dist_tyc2) (162)
     1497-1505  F9.5  deg         RA6deg    Tyc2 Right ascension (J2000) (RA_tyc2)
     1507-1515  F9.5  deg         DE6deg    Tyc2 Declination (J2000) (DEC_tyc2)
     1517-1523  I7    ---        RecnoTYC2  ? Tyc2 Catalogue number (RecNo_tyc2)
     1525-1530  F6.3  mag         VTmag     ? Tyc2 VT magnitude (VTmag_tyc2) (6)
     1532-1537  F6.3  mag         BTmag     ? Tyc2 BT magnitude (BTmag_tyc2) (6)
     1539-1542  I4    ---         TYC1      ? Tyc2 TYC1 number (TYC1_tyc2) (7)
     1544-1548  I5    ---         TYC2      ? Tyc2 TYC2 number (TYC2_tyc2) (7)
        1550  I1    ---         TYC3      ? Tyc2 TYC3 number (TYC3_tyc2) (7)
        1552  I1    ---         mBSC      ? Number of counterparts in the
                                             Catalogue of Bright Stars (BSC)
                                             within the distance of 300" (mult_bri)
     1554-1557  I4    ---         eBSC      ? Source number of nearest BSC
                                             counterpart (entr_bri)
     1559-1564  F6.1  arcsec      dBSC      ?=0 Distance to nearest BSC counterpart
                                             (dist_bri)
     1566-1574  F9.5  deg         RA7deg    BSC Right ascension (J2000) (RA_bri)
     1576-1584  F9.5  deg         DE7deg    BSC Declination (J2000) (DEC_bri)
     1586-1591  F6.3  mag         VmagBSC   ? BSC V magnitude (Vmag_bri)
     1593-1612  A20   ---        SpTypeBSC  BSC spectral type (SpType_bri)
     1614-1617  I4    ---         RecnoBSC  ? BSC Record catalogue number
                                             (RecNo_bri)
     1619-1624  I6    ---         HD        ? Henry Draper Catalogue Number (HD_bri)
        1626  I1    ---         mHMXB     ? Number of counterparts in the Catalog
                                             of High Mass X-Ray Binaries (HMXBCAT)
                                             within the distance of 60" (mult_hmxb)
     1628-1630  I3    ---         eHMXB     ? Source number of nearest HMXBCAT
                                               counterpart (entr_hmxb)
     1632-1637  F6.1  arcsec      dHMXB     ?=0 Distance of nearest HMXBCAT
                                             counterpart (dist_hmxb)
     1639-1647  F9.5  deg         RA8deg    HMXBCAT Right ascension (J2000)
                                             (RA_hmxb)
     1649-1657  F9.5  deg         DE8deg    HMXBCAT Declination (J2000) (DEC_hmxb)
     1659-1679  A21   ---         NameHMXB  HMXBCAT Catalogue name  (Name_hmxb)
     1681-1701  A21   ---        Name2HMXB  HMXBCAT Alternative catalogue name
                                             (Name2_hmxb)
     1703-1708  F6.3  mag         VmagHMXB  ? HMXBCAT V magnitude (Vmag_hmxb)
        1710  I1    ---         mLMXB     ? Number of counterparts in the Catalog
                                             of Low Mass X-Ray Binaries (LMXBCAT)
                                             within the distance of 60" (mult_lmxb)
     1712-1714  I3    ---         eLMXB     ? Source number of nearest LMXBCAT
                                             counterpart (entr_lmxb)
     1716-1721  F6.1  arcsec      dLMXB     ?=0 Distance to nearest LMXBCAT
                                             counterpart (dist_lmxb)
     1723-1731  F9.5  deg         RA9deg    LMXBCAT Right ascension (J2000)
                                             (RA_lmxb)
     1733-1741  F9.5  deg         DE9deg    LMXBCAT Declination (J2000) (DEC_lmxb)
     1743-1758  A16   ---         NameLMXB  LMXBCAT Catalogue name (Name_lmxb)
     1760-1772  A13   ---        Name2LMXB  LMXBCAT Alternative catalogue name
                                             (Name2_lmxb) (194)
     1774-1779  F6.3  mag         VmagLMXB  ? LMXBCAT V magnitude (Vmag_lmxb)
     1781-1782  I2    ---         mATNF     ? Number of counterparts in the Pulsar
                                             Catalogue (ATNF) within the distance
                                             of 60" (mult_atnf)
     1784-1787  I4    ---         eATNF     ? Source number of nearest ATNF
                                             counterpart (entr_atnf)
     1789-1794  F6.1  arcsec      dATNF     ?=0 Distance to nearest ATNF counterpart
                                             (dist_atnf)
     1796-1804  F9.5  deg         RA10deg   ATNF Right ascension (J2000) (RA_atnf)
     1806-1814  F9.5  deg         DE10deg   ATNF Declination (J2000) (DEC_atnf)
     1816-1831  A16   ---         ATNF      ATNF Pulsar name  (Name_atnf)
     1833-1843  A11   ---         TypeATNF  ATNF Pulsar type (Type_atnf)
     1845-1865  A21   s           PerATNF   ATNF Pulsar period  (Period_atnf)
        1867  I1    ---         mFUH      ? Number of counterparts in the Catalog
                                             of Variable Sources from Fuhrmeister
                                             and Schmitt within the distance of 60"
                                             (mult_fuh)
     1869-1872  I4    ---         eFUH      ? Source number of nearest FUH
                                             counterpart (entr_fuh)
     1874-1879  F6.1  arcsec      dFUH      ?=0 Distance to nearest FUH counterpart
                                             (dist_fuh)
     1881-1889  F9.5  deg         RA11deg   FUH Right ascension (J2000) (RA_fuh)
     1891-1899  F9.5  deg         DE11deg   FUH Declination (J2000) (DEC_fuh)
     1901-1904  A4    ---         SeqFUH    FUH Object number (Seq_fuh)
     1906-1935  A30   ---         NameFUH   FUH Object name (Name_fuh)
     1937-1938  I2    ---         m1SXPS    ? Number of counterparts in Swift 1SXPS
                                             catalogue within a distance of 120"
                                             (mult_1sxps)
     1940-1945  I6    ---         e1SXPS    ? Source number of nearest 1SXPS
                                             counterpart (entr_1sxps)
     1947-1952  F6.1  arcsec      d1SXPS    ?=0 Distance to nearest 1SXPS
                                             counterparts (dist_1sxps)
     1954-1962  F9.5  deg         RA12deg   1SXPS Right ascension (J2000) (RA_1sxps)
     1964-1972  F9.5  deg         DE12deg   1SXPS Declination (J2000) (DEC_1sxps)
     1974-1980  I7    s           Exp1SXPS  ? 1SXPS Source exposure time
                                             (Expos_1sxps)
     1982-1983  I2    ---         Det1SXPS  ? 1SXPS Total(0.3-10keV)-band detection
                                             flag (DET_1sxps)
     1985-1987  I3    ---        Det01SXPS  ? 1SXPS Total(0.3-10keV)-band detection
                                             flag (DET0_1sxps)
     1989-1991  I3    ---        Det11SXPS  ? 1SXPS Soft(0.3-1keV)-band detection
                                             flag (DET1_1sxps)
     1993-1995  I3    ---        Det21SXPS  ? 1SXPS Meduin(2-2keV)-band detection
                                             flag (DET2_1sxps)
     1997-1999  I3    ---        Det31SXPS  ? 1SXPS Hard(2-10keV)-band detection
                                             flag (DET3_1sxps)
     2001-2006  I6    ---         1SXPS     ? Running catalogue number in Swift
                                             (INDEX_1sxps)
     2008-2017  F10.6 ct/s        CR01SXPS  ? Swift Total (0.3-10 keV)-band count
                                             rate (Rate0_1sxps)
     2019-2026  F8.6  ct/s      e_CR01SXPS  ? Swift Error of Rate0_1sxps
                                             (ERate0_1sxps)
     2028-2030  I3    ---         m1RXH     ? Number of counterparts in the 1RXH
                                             catalogue within the distance of 120"
                                             (mult_1rxh)
     2032-2036  I5    ---         e1RXH     ? Source number of nearest 1RXH
                                             counterpart (entr_1rxh)
     2038-2043  F6.1  arcsec      d1RXH     ?=0 Distance to nearest 1RXH counterpart
                                             (dist_1rxh)
     2045-2053  F9.5  deg         RA13deg   1RXH Right ascension (J2000) (RA_1rxh)
     2055-2063  F9.5  deg         DE13deg   1RXH Declination (J2000) (DEC_1rxh)
     2065-2085  A21   ---         1RXH      Source name in the 1RXH (SRCNAME_1rxh)
     2087-2095  F9.6  ct/s        CR1RXH    ? 1RXH Source count rate (CRATE_1rxh)
     2097-2104  F8.6  ct/s        e_CR1RXH  ? Error of CRATE_1RXH (CRATEerr1rxh)
     2106-2111  I6    s           ETim1RXH  ? 1RXH Source exposure time
                                             (ExpTime_1rxh)
     2113-2117  F5.1  ---         SNR1RXH   ? 1RXH Signal-to-noise ratio (SNR_1rxh)
        2119  I1    ---         mFlem     ? Number of counterparts in the Catalog
                                             of White Dwarfs from Flemming within
                                             the distance of 60"  (mult_flem)
     2121-2123  I3    ---         eFlem     ? Source number of nearest Flemming
                                             counterpart (entr_flem)
     2125-2130  F6.1  arcsec      dFlem     ?=0 Distance to nearest Flemming
                                              counterpart (dist_flem)
     2132-2140  F9.5  deg         RA14deg   Flemming Right ascension (J2000)
                                             (RA_flem)
     2142-2150  F9.5  deg         DE14deg   Flemming Declination (J2000) (DEC_flem)
     2152-2165  A14   ---         Flem      Source name in the Flemming Catalogue
                                             (SRCNAME_flem)
     2167-2176  A10   ---         TypeFlem  Flemming  Object type (Type_flem)
        2178  A1    ---         WFCFlem   [Y/N] Flemming Wide Field Camera
                                             detection?  (WFC_flem)
     2180-2185  F6.3  ct/s        CRFlem    ? Flemming count rate (Rate_flem)
     2187-2194  F8.6  ct/s        e_CRFlem  ? Error of the Flemming count rate
                                             (eRateflem)
        2196  I1    ---         mWD       ? Number of counterparts in the Catalog
                                             of White Dwarfs within the distance
                                             of 60 " (mult_wd)
     2198-2202  I5    ---         eWD       ? Source number of nearest WD
                                               counterpart (entr_wd)
     2204-2209  F6.1  arcsec      dWD       ?=0 Distance to nearest WD counterpart
                                             (dist_wd)
     2211-2219  F9.5  deg         RA15deg   WD Rigth ascension (J2000) (RA_wd)
     2221-2229  F9.5  deg         DE15deg   WD Declination (J2000) (DEC_wd)
     2231-2240  A10   ---         WD        WD Source name in the Catalogue
                                             (SRCNAME_wd)
     2242-2247  F6.3  mag         VmagWD    ? WD V-magnitude (Vmag_wd)
     2249-2254  F6.3  mag         VsphotWD  ? WD V mag: multichannel
                                             spectrophotometry (Vsphot_wd)
        2256  I1    ---         mSDSS     ? Source number of the nearest
                                             counterpart in the Sloan Catalogue
                                             (mult_sdss)
     2258-2260  I3    ---         eSDSS     ? Source number of SDSS nearest
                                             counterpart (entr_sdss)
     2262-2267  F6.1  arcsec      dSDSS     ?=0 Distance to nearest SDSS counterpart
                                             (dist_sdss)
     2269-2277  F9.5  deg         RA16deg   SDSS Right ascension (J2000) (RA_sdss)
     2279-2287  F9.5  deg         DE16deg   SDSS Declination (J2000) (DEC_sdss)
     2289-2312  A24   ---         SDSS      SDSS Object name (SDSS_NAME)
     2314-2323  F10.6 deg         LambdaS   ? SDSS Latitude in elliptical coordinate
                                             (LAMBDA_sdss)
     2325-2334  F10.6 deg         BetaS     ? SDSS  Longitude in elliptical
                                             coordinate (BETA_sdss)
     2336-2337  I2    ---         m2RXS     ? Number of counterparts in the 2RXS
                                             catalogue within the distance of 60"
                                             (mult_2rxs)
     2339-2344  I6    ---         e2RXS     ? Source number of 2RXS counterpart
                                             (entr_2rxs)
     2346-2351  F6.1  arcsec      d2RXS     ?=0 Distance to 2RXS counterpart
                                             (dist_2rxs)
     2353-2358  I6    ---         I2RXS     ? Index of the nearest 2RXS counterpart
                                             (INDEX_2rxs)
     2360-2365  I6    ---         Seq2RXS   ? Number of sky field of 2RXS nearest
                                             counterpart (SEQID2rxs)
     2367-2370  I4    ---         IndD2RXS  ? Field detection number of 2RXS nearest
                                             counterpart (INDDET2rxs)
     2372-2380  F9.2  ---        ExiML2RXS  ? Detection likelihood of 2RXS  nearest
                                             counterpart (EXIML2rxs)
     2382-2389  F8.4  ct/s        CR2RXS    ? Source count rate of 2RXS nearest
                                             counterpart (RATE_2rxs)
     2391-2399  F9.5  deg         RA17deg   2RXS Right ascension (J2000) (RA_2rxs)
     2401-2409  F9.5  deg         DE17deg   2RXS Declination (J2000) (DEC_2rxs)
     2411-2412  I2    ---         USKY2rxs  [-1/9]? Sub-field detection cell of
                                              2RXS nearest counterpart (USKY_2rxs)
        2414  I1    ---         Flag2rxs  [0/1]? Nearby flag of 2RXS nearest
                                             counterpart, 0=best (FLAG_2rxs)
        2416  I1    ---         BkgId     ? Selected background (BKG_id)
     2418-2426  F9.2  pix         Xbkg1     ? X_sky coordinate of background
                                             center 1 in sky pixel (XBKG1)
     2428-2436  F9.2  pix         Ybkg1     ? Y_sky coordinate of background
                                             center 1 in sky pixel (YBKG1)
     2438-2446  F9.2  pix         Xbkg2     ? X_sky coordinate of background
                                             center 2 in sky pixel (XBKG2)
     2448-2456  F9.2  pix         Ybkg2     ? Y_sky coordinate of background
                                             center 2 in sky pixel (YBKG2)
     2458-2466  E9.3 ct/s/arcmin2 BGR1rxs   ? Background count rate per square
                                             arcmin from 1RXS (BGR_1rxs)
     2468-2479  E12.6 ct/s/arcmin2 BGR2rxs  Background count rate per square arcmin
                                             from 2RXS (BGR_2rxs)
        2481  I1    ---         Lflag     ? Variability flag  0=good,1=bkg
                                             (LFLAG) (8)
     2483-2491  F9.5  ct/s        CM6       ? Count rate for light curve with less
                                             than 6s exposure (CM6)
     2493-2501  F9.5  ct/s        CD6       ? Standard deviation of light curves
                                             with less than 6s exposure (CD6)
     2503-2514  E12.6 ---         ExVAR6    ? Excess variance for light curves
                                             with less than 6s exposure
                                              (EXCESSVAR6)
     2516-2527  E12.6 ---         e_ExVAR6  ? Excess variance uncertainty
                                             (UNCERTAINTY6)
     2529-2532  I4    ---         NbinsA    ? Number of data points in the LC
                                             (NBINS_A)
     2534-2537  I4    ---         Nbins6    ? Number of data points with exposures
                                             times less than 6s (NBINS_6)
     2539-2540  I2    ---         Nbins1    ? Number of data points with exposures
                                             times less than 1s (NBINS_1)
     2542-2543  I2    ---         NbinsN    ? Number of data points with exposure
                                             times greater than 6s (NBINS_N)
     2545-2554  F10.6 ct/s        Cmin6     ? Minimum count rate for light curves
                                             with exposure times of less than 6s
                                             (CMIN6)
     2556-2565  F10.6 ct/s        Cmax6     ? Maximum count rate for light curves
                                             with exposure times of less than 6s
                                             (CMAX6)
     2567-2574  F8.6  ct/s        e_Cmin6   ? Error of CMIN6 (EMIN6)
     2576-2583  F8.6  ct/s        e_Cmax6   ? Error of CMAX6 (EMAX6)
     2585-2593  F9.2  ct          CTSlc6    [-]? Number of counts for light curves
                                             with exposure times of less than 6s
                                             (CTS_lc6) Not used
     2595-2604  F10.6 ---         sigex6    ? Excess variance for light curves with
                                             exposure times of less than 6s
                                             (SIGMA_excess6)
     2606-2615  F10.6 ---         CM+CD     ? Sum of count rate + standard deviation
        2617  A1    ---         SPX       [0/1] graphical illustrations from
                                             spectral fits available in spx
                                             subdirectory
        2619  A1    ---         LCX       [0/1] light curve exists as graphical
                                             illustration in clx subdirectory
     2621-2631  F11.1 s          ObsClock1  ? Start time of exposure when source is
                                             within FOV and detector ons
                                             (OBSCLOCK1)
     2633-2643  F11.1 s          ObsClock2  ? End time of exposure when source is
                                             within FOV and detector ons
                                             (OBSCLOCK2)
     2645-2655  A11 "DD-MMM-YYYY" Obs.date1  ? Start time of exposure when source is
                                             within FOV and detector on (OBSDATE1)
     2657-2666  A10   "h:m:s"    Obs.time1  ? Start time (OBSUT1)
     2668-2678  A11 "DD-MMM-YYYY" Obs.date2  ? End time of exposure when source
                                             is within FOV and detector on
                                             (OBSDATE2)
     2680-2689  A10   "h:m:s"    Obs.time2  ? End time (OBSUT2)
     2691-2696  I6    ---         ---       ? Running number from total detection
                                             run (ID_2RXS)

    Note (1): Each source has been attributed an IAU name according to the IAU
      conventions. As this is the second ROSAT catalogue of point sources
      the prefix 2RXS is given in addition to the coordinate naming convention.
    Note (2): Hardness ratio 1 values as calculated from the source counts in the
      energy channels A (11-41), B (52-201) by: HR_1=(B-A)/(B+A)
     Hardness ratio 2 values as calculated from the source counts in the
      energy channels C (52-90), D(91-201) by: HR_2=(D-C)/(D+C)
    Note (3): Sub-field detection cell defined in sky coordinates.

    Note (4): Screening flag (0=good, not equal to 0 = screening flag set)

    Note (5): 1RXS hardness ratio 1 values have been calculated from the source
      counts in the energy channels A (11-41), B (52-201) by: HR_1=(B-A)/(B+A)
      in 1RXS
     Hardness ratio 2 values have been calculated from the source counts in the
      energy channels C (52-90), D(91-201) by: HR_2=(D-C)/(D+C) in the 1RXS
    Note (6): (cf Note 7 of the Tycho-2 online catalogue description).

    Note (7): Tyhco 2 name (c.f. Note 1 of the Tycho-2 online catalogue description)

    Note (8): quality flag for background selection for lightcurves and spectra:
         0=good, bit 1: sum of CM+CD<0, bit 2: background in masked region

    Acknowledgements:
       Thomas Boller, bol(at)mpe.mpg.de
       Frank Haberl, fwh(at)mpe.mpg.de
       Michael Freyberg, mjf(at)mpe.mpg.de
    ================================================================================
    (End)                                        Patricia Vannier [CDS]  23-Mar-2016