ACDS V10.0 - Detailed Description of IX/55

ACDS V10.0 - Wed Apr 17 12:49:04 CEST 2019

| # Detailed Description of IX/55 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR8 (XMM-SSC, 2018) |

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.

    IX/55        XMM-Newton Serendipitous Source Catalogue 3XMM-DR8 (XMM-SSC, 2018)
    ================================================================================
    The XMM-Newton serendipitous survey.
    VII. The third XMM-Newton serendipitous source catalogue.
       Rosen S.R., Webb N.A., Watson, M.G., Ballet J., Barret D., Braito V.,
       Carrera F.J., Ceballos M.T., Coriat M., Della Ceca R., Denkinson G.,
       Esquej P., Farrell S.A., Freyberg M., Grise F., Guillout P., Heil L.,
       Law-Green D., Lamer G., Lin D., Martino R., Michel L., Motch C.,
       Nebot Gomez-Moran A., Page C.G., Page K., Page M., Pakull M.W., Pye J.,
       Read A., Rodriguez P., Sakano M., Saxton R., Schwope A., Scott A.E.,
       Sturm R., Traulsen I., Yershov V., Zolotukhin I.
       <XMM-SSC, Leicester, UK; Astron. Astrophys. 590, A1 (2016)>
       =2019yCat.9055....0R
       =2016A&A...590A...1R
    ================================================================================
    ADC_Keywords: X-ray sources ; Surveys

    Mission_Name: XMM

    Keywords: catalogs - astronomical data bases - surveys - X-rays: general

    Description:
        The 3XMM-DR8 catalogue contains source detections drawn from 10242
        XMM-Newton EPIC observations, covering an energy interval from 0.2 keV
        to 12 keV. These observations were made between 2000 February 3 and
        2017 November 30 and all datasets were publicly available by 2017
        December 31, but not all public observations are included in this
        catalogue (see below for more information).

        Should you use the catalogue for your research and publish the
        results, please use the acknowledgement below and cite the paper
        describing 3XMM (Rosen, Webb, Watson et al., 2016A&A...590A...1R).

        This research has made use of data obtained from the 3XMM XMM-Newton
        serendipitous source catalogue compiled by the 10 institutes of the
        XMM-Newton Survey Science Centre selected by ESA.

        The following table gives an overview of the statistics of the
        catalogue in comparison with the 3XMM-DR7 catalogue.

        ---------------------------------------------------------------------------
                                                3XMM-DR8   3XMM-DR7    Increment
        ---------------------------------------------------------------------------
        Number of observations                  10242       9710       532
        Number of 'clean' observations           6496       6164       332
         (i.e., observation class < 3)
        Observing interval                    03-Feb-00   03-Feb-00
                                              30-Nov-17   15-Dec-16    1 yr
        Sky coverage, taking overlaps into account
         ( >=1ksec exposure)                  1089sq.deg  1032sq.deg  57sq.deg
        Number of detections                   775153      727790     47363
        Number of 'clean' detections
         (i.e., summary flag < 3)              633733      596268     37465
        Number of unique sources               531454      499266     32188
        Number of 'cleanest' (summary flag = 0, 12256       11220      1036
         not in high-background fields) extended
         detections
        Number of detections with spectra      173277      162082     11195
        Number of detections with timeseries   173208      162045     11163
                                                 5934        5631       303
        Number of detections where probability
         of timeseries being constant is
         <1x10-5
        ---------------------------------------------------------------------------

       The production and content of the 3XMM catalogue is described in the
          the 3XMM-DR8 User Guide at
     http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR8/3XMM-DR8_Catalogue_User_Guide.html

        The slimline version of the catalogue (file "xmm3r8s.dat") contains
        one row per unique source (while the the main catalogue has one row
        per detection) and thus has 531454 rows. There are 44 columns,
        essentially those containing information about the unique sources. The
        catalogue also contains a column with links to the IRAP catalogue
        server summary pages. In the case of sources with multiple detections,
        the summary page of the best detection is selected (i.e., the
        detection with the largest exposure time, summed over all cameras),
        and the summary page gives cross-links to the other detections.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × xmm3r8s.dat      549   531454   The 3XMM-DR8 Catalog, "slim" version
    × xmm3r8.fit      2880    46696   Full 3XMM-DR8 Catalog (727790 detections)
    × summary.dat      127    10242   List of observations

    See also:
      http://xmmssc-www.star.le.ac.uk/Catalogue : XMM-Newton Home Page
      http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR8/3XMM_DR8.html :
                                                              3XMM Home Page
      http://xmmssc-www.star.le.ac.uk/ : XMM-Newton Survey Science Centre,
                                                             University of Leicester
      http://xmm.vilspa.esa.es/ : XMM-Newton Science Operations Centre
      http://xcatdb.u-strasbg.fr/xcat-db/ : XCAT-DB at SSC institute, Strasbourg
      J/A+A/493/339 : XMM-Newton serendipitous Survey V. (Watson+, 2009)
      B/xmm : XMM-Newton Observation Log   (XMM-Newton Science Operation Center)

    Byte-by-byte Description of file:  xmm3r8s.dat

       Bytes Format Units   Label    Explanations

       1- 15  I15   ---     Source   [200001101010001/207957124010063]
                                     (SRCID) Unique source index
      17- 20  A4    ---     ---      [3XMM]
      22- 37  A16   ---     3XMM     (IAUNAME) Unique source name (JHHMMSS.s+DDMMSS)
      39- 48  F10.6 deg     RAdeg    (SC_RA) Mean source right ascension (ICRS)
      50- 59  F10.6 deg     DEdeg    (SC_DEC) Mean source declination (ICRS)
      61- 69  F9.6  arcsec  ePos     [0.03/20] (SC_POSERR) Mean error on position
      71- 82  E12.6 ---     srcML    (SCDETML) Source detection likelihood (2)
      84- 95  E12.6 mW/m2   Flux1    (SCEP1_FLUX) Mean flux in 0.2-0.5keV band
      97-108  E12.6 mW/m2   e_Flux1  (SCEP1FLUXERR) Mean error on Flux1
     110-121  E12.6 mW/m2   Flux2    (SCEP2_FLUX) Mean flux in 0.5-1.0keV band
     123-134  E12.6 mW/m2   e_Flux2  (SCEP2FLUXERR) Mean error on Flux2
     136-147  E12.6 mW/m2   Flux3    (SCEP3_FLUX) Mean flux in 1.0-2.0keV band
     149-160  E12.6 mW/m2   e_Flux3  (SCEP3FLUXERR) Mean error on Flux3
     162-173  E12.6 mW/m2   Flux4    (SCEP4_FLUX) Mean flux in 2.0-4.5keV band
     175-186  E12.6 mW/m2   e_Flux4  (SCEP4FLUXERR) Mean error on Flux4
     188-199  E12.6 mW/m2   Flux5    (SCEP5_FLUX) Mean flux in 4.5-12keV band
     201-212  E12.6 mW/m2   e_Flux5  (SCEP5FLUXERR) Mean error on Flux5
     214-225  E12.6 mW/m2   Flux8    (SCEP8_FLUX) Mean flux in 0.2-12keV band
     227-238  E12.6 mW/m2   e_Flux8  (SCEP8FLUXERR) Mean error on Flux8
     240-251  E12.6 mW/m2   Flux9    ? (SCEP9_FLUX) Mean flux in 0.5-4.5keV band
     253-264  E12.6 mW/m2   e_Flux9  ? (SCEP9FLUXERR) Mean error on Flux9
     266-274  F9.6  ---     HR1      [-1/1]? (SC_HR1) Hardness ratio, bands 1,2 (1)
     276-287  E12.6 ---     e_HR1    ? (SCHR1ERR) Mean error on HR1
     289-297  F9.6  ---     HR2      [-1/1]? (SC_HR2) Hardness ratio, bands 2,3 (1)
     299-310  E12.6 ---     e_HR2    ? (SCHR2ERR) Mean error on HR2
     312-320  F9.6  ---     HR3      [-1/1]? (SC_HR3) Hardness ratio, bands 3,4 (1)
     322-333  E12.6 ---     e_HR3    ? (SCHR3ERR) Mean error on HR3
     335-343  F9.6  ---     HR4      [-1/1]? (SC_HR4) Hardness ratio, bands 4,5 (1)
     345-356  E12.6 ---     e_HR4    ? (SCHR4ERR) Mean error on HR4
     358-366  F9.6  arcsec  ext      (SC_EXTENT) Total band extent
     368-379  E12.6 ---     extML    (SCEXTML) Detection likelihood of the
                                      extended source (3)
     381-388  F8.6  ---     Cst      [0/1]? (SC_CHI2PROB) Constant probability (4)
     390-399  F10.6 ---     Fvar     ? (SC_FVAR) fractional excess variance of
                                      the unique source (6)
     401-411  F11.6 ---     e_Fvar   ? (SC_FVARERR) Mean error on Fvar
         413  I1    ---     V        [0/1] (SCVARFLAG) Variability flag (V=1)
         415  I1    ---     S        [0/4] (SCSUMFLAG) summary flag, 0=best (5)
     417-428  E12.6 mW/m2   F8min    (SCEP8_FMIN) Minimum flux in 0.5-4.5keV band
     430-441  E12.6 mW/m2   e_F8min  (SCEP8FMINERR) Mean error on F8min
     443-454  E12.6 mW/m2   F8max    (SCEP8_FMAX) Maximum flux in 0.5-4.5keV band
     456-467  E12.6 mW/m2   e_F8max  (SCEP8FMAXERR) Mean error on F8max
     469-478  F10.4 d       MJD0     [51577/58088] (MJD_FIRST) Date of first
                                      observation (MJD)
     480-489  F10.4 d       MJD1     [51577/58088] (MJD_LAST) Date of last
                                      observation (MJD)
     491-492  I2    ---     Nd       [1/59]? (N_DETECTIONS) Number of detections
         494  I1    ---     c        [0/1] (CONFUSED) Confusion flag (7)
     496-549  A54   ---     uIRAP    (WEBPAGE_URL) URL for details at IRAP

    Note (1): The hardness ratio is defined as   (F2-F1)/(F2+F1)
         if F2 is the flux in the harder band (the hardness ratio is
         therefore -1 for softest sources and +1 for hardest sources).
         The energy bands are:
       1 = 0.2 -  0.5 keV (narrow band)
       2 = 0.5 -  1.0 keV (narrow band)
       3 = 1.0 -  2.0 keV (narrow band)
       4 = 2.0 -  4.5 keV (narrow band)
       5 = 4.5 - 12.0 keV (narrow band)
       6 = 0.2 -  2.0 keV = soft broad band, no images made
       7 = 2.0 - 12.0 keV = hard broad band, no images made
       8 = 0.2 - 12.0 keV = total band
       9 = 0.5 -  4.5 keV = XID band
    Note (2): defined as the maximum of the likelihoods of all detections
         of this source.
    Note (3): defined as the average of the extent likelihoods of all
         detections of this source.
    Note (4): {chi}2 probability that the unique source as detected by
         any of the observations is constant, that is, the minimum value
         of the EPIC probabilities in each detection.
    Note (5): the summary flag of the source is derived from the EPIC flag,
        and is assigned the following values:
       0 = good: none of the EPIC flags was set.
       1 = source parameters may be affected: at least one of the EPIC warning
            flags was set, but no possible-spurious detection flag is set.
       2 = possibly spurious source: at least one of the possible-spurious
            detection flags was set but not the manual flag
       3 = source located in a area where spurious detection may occur.
       4 = source located in a area where spurious detection may occur and is
            possibly spurious.
    Note (6): The fractional excess variance of the unique source. It is the
        value corresponding to the exposure and instrument that shows the
        lowest probability of being constant.
    Note (7): This flag (1=true, 0=false) signifies that the 3-{sigma} error
         circle of a detection within this unique source overlaps the 3-{sigma}
         error circle of a nearby unique source. As such, it is an indicator of
         possible confusion (uncertainty) about the assignment of detections
         between sources.

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

       Bytes Format Units   Label    Explanations

       1-  4  I04   ---     Rev      [28/3292] (REVOLUT) Satellite revolution number
       6- 15  I010  ---     ObsID    (OBS_ID) XMM Observation number (Cat. B/xmm)
      17- 19  I03   ---     iODF     [1/10] (ODF_VERS) Data File (ODF) number
      21- 30  F10.6 deg     RAdeg    (RA) field Right Ascension (J2000)
      32- 41  F10.6 deg     DEdeg    (DEC) field Declination (J2000)
      43- 61  A19   ---     Target   (TARGET) name
          63  I1    ---     Q        [0/5] (OBS_CLASS) Observations quality (1)
      65- 67  I3    ---     Nd       [1/731] (NDET) Number of detections in field
      69- 71  I3    ---     Ng       [0/391] (NDETGOOD) Number of good detections
                                      in field
          73  I1    ---     Np       [1/5]? (PN_NEXP) Number of PN exposures merged
      75- 77  A3    ---     f.PN     (PN_FILT) Filter of the PN exposure(s) (2)
      79- 82  A4    ---     m.PN     (PN_MODE) Mode of the PN exposure(s) (3)
      84- 89  I6    s       t.PN     ?=- (PN_TEXP) Total PN exposure time
          91  I1    ---     N1       [1/5]? (M1_NEXP) Number of M1 exposures merged
      93- 95  A3    ---     f.M1     (M1_FILT) Filter of the M1 exposure(s) (2)
      97-101  A5    ---     m.M1     (M1_MODE) Mode of the M1 exposures (3)
     103-108  I6    s       t.M1     ?=- (M1_TEXP) Total M1 exposure time
         110  I1    ---     N2       [1/5]? (M2_NEXP) Number of M2 exposures merged
     112-114  A3    ---     f.M2     (M2_FILT) Filter of the M2 exposure(s) (2)
     116-120  A5    ---     m.M2     (M2_MODE) Mode of the M2 exposures (3)
     122-127  I6    s       t.M2     ?=- (M2_TEXP) Total M2 exposure time

    Note (1): Quality classification of the whole observation based on the area
         flagged as bad in the manual flagging process
    Note (2): EPIC camera filters of catalogue observations:
      Med=MEDIUM, Tn1=THIN1, Tn2=THIN2, Tck=THICK, Opn=OPEN,
    Note (3): MOS modes:
       PFW  = Prime Full Window
       PPW2 = Prime Partial W2
       PPW3 = Prime Partial W3
       PPW4 = Prime Partial W4
       PPW5 = Prime Partial W5
         FU = Fast Uncompressed
         FC = Fast Compressed
      PPRFS = Prime Partial Refreshed Frame Store

    History:
        From https://www.cosmos.esa.int/web/xmm-newton/xsa#download
    ================================================================================
    (End)                                      Patricia Vannier [CDS]    30-Jan-2019