ACDS V10.0 - Detailed Description of IX/30

ACDS V10.0 - Sun Jan 19 11:41:23 CET 2025

| # Detailed Description of IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000) |

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/30               Second ROSAT PSPC Catalog        (ROSAT, 2000)
    ================================================================================
    The Second ROSAT Source Catalog of Pointed Observations
         ROSAT Consortium
        <ROSAT News 72, 25-May-2000 (2000)>
    ================================================================================
    ADC_Keywords: X-ray sources ; Surveys

    Mission_Name: ROSAT

    Description:
        This catalogue contains sources from PSPC-ROSAT (Position-Sensitive
        Proportional Counter aboard the Roentgen Satellite), as provided
        by Max-Planck Institut fuer extraterrestrische Physik (MPE). It
        supersedes the 1994 version (Cat. IX/11)

        The current release of the catalog is comprised of results from 4093
        sequences (sky coverage of 14.5%). The complete version contains
        entries for 95,331 detections whereas the short version has 43,156
        detections. 2189 obvious sources were not detected by the automated
        Standard Analysis Software System (SASS), and are not yet contained in
        this catalogue.

        These data have been screened by ROSAT data centers in the US,
        Germany, and the UK as a step in the production of the ROSAT RESULTS
        ARCHIVE. The RRA contains extracted source and associated products
        with an indication of reliability for the primary parameters.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × 2rxp.dat         393    95331   The 2RXP Catalog
    × 2rxp_s.dat       393    43156   The "short" 2RXP Catalog
                                   (restricted to high confidence detections)
    × seqp.dat         174     4093   The sequences of observations

    See also:
        http://www.xray.mpe.mpg.de/rosat/rra/ : the ROSAT Results Archive Home Page
        IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)
        IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
        J/A+AS/114/465 : ROSAT XUV Pointed Phase Source Catalogue (Kreysing+ 1995)
        J/MNRAS/274/1165 : The 2RE Source Catalogue (Pye+ 1995)

    Byte-by-byte Description of file:  2rxp.dat  2rxp_s.dat

       Bytes Format Units   Label     Explanations

       1- 16  A16   ---     Seq       ROSAT detection sequence number
          21  A1    ---     S        *[S] for source in "short" catalog
          22  A1    ---     m_2RXP   *[a-l] Multiplicity index
      23- 26  A4    ---     ---       [2RXP]
      28- 43  A16   ---     2RXP     *2RXP designation (Jhhmmss.s+ddmmss)
      45- 47  I3    arcsec  ErrPos    ? Error in position (G1)
      50- 58  E9.4  ct/s    Crate     Estimate of net count rate
      60- 67  E8.3  ct/s    e_Crate   ? Error of Crate (G1)
      69- 73  F5.1  ---     LhMdet    Source likelihood from the L/MDETEC algorithm
                                        (MD_LIKE, truncated at 999.9)
      75- 76  I2    arcmin  oax       Off-axis angle averaged over observation
      79- 83  I5    s       ExpTime   Exposure time
          85  A1    ---     Var       [NTP] Source variability flag:
                                            Negative / Too_few / Possible
      88-100  A13   ---     SrcFlags *[cdefislmnpavw.]  Source Flags
     102-109  A8    ---     SeqFlags *[DABEFMSX.]  Sequence flags
     111-116  I6   "YYMMDD" QCdate    Date of sequence and source checking
     118-121  A4    ---     QCsite    Checker Site
     123-126  A4    ---     QDname    Checker ID
     128-132  A5    ---     Com       Source comment
     136-141  I6   "YYMMDD" Tbeg      Observation start date
     143-148  I6   "YYMMDD" Tend      Observation finish date
     150-164  A15   ---     ObsID     Observation ID (e.g. US400623H.N1)
     167-170  A4    ---     Site      Processing Site (USRS / MPE / PE / SRS)
     174-181  F8.4  deg     RAdeg     Source Right ascension (J2000)
     183-190  F8.4  deg     DEdeg     Source Declination (J2000)
     192-199  F8.4  deg     GLON      Galactic longitude
     201-208  F8.4  deg     GLAT      Galactic latitude
     211-216  F6.2 15arcsec imX       Blocked x source position
     218-223  F6.2 15arcsec imY       Blocked Y source position
     226-229  F4.2 15arcsec e_imX     ? Error on imX (G1)
     231-235  F5.2 15arcsec e_imY     ? Error on imY (G1)
     238-239  I2    arcmin  Drb       Corrected source-rib distance
                                       (truncated at 99)
     241-243  I3    arcmin  Dsr       [0,99]?=999 Corrected source-source distance
                                       (truncated at 99)
     245-249  F5.3  ---     Vig      *? Vignetting factor (G1)
     251-255  F5.2 ct/s/arcmin2 bgCt  Background countrate
                                       (truncated to -9.99 ... 99.99)
     257-262  A6    ---     DetFlags *[01] Source detection string (3)
         263  A1    ---     DetML    *[ABCDb ] band in which ML detection occurred
     265-268  I4    ---     LhMdet2   Source likelihood from the L/MDETEC algorithm
                                       (truncated at 9999)
     270-272  I3    arcsec  Dcs       Width of detect square
     275-277  I3    ---     MSX       Source number from merged source list (MPLSX)
         279  A1    ---     Mdet      [M.] set to 'M' if Crate was taken from MDETEC
                                        (as well as some other parameters)
     281-284  I4    ---     LhML      ? Source likelihood from the ML algorithm
                                        (ML_LIKE, truncated to 999) (G1)
     286-288  I3    arcsec  rML       Extraction radius used in ML algorithm
     291-293  I3    arcsec  Ext       sigma of Gaussion distribution fitted to data
     295-298  I4    ---     ExtL      Likelihood of source extent
                                       (truncated to 9999)
     301-304  A4    ---     Vflags   *[ckuf.] variability flags
     307-311  F5.2  ---     HR1      *Hardness ratio 1 (truncated to -9.99...99.99)
     313-316  F4.2  ---     e_HR1     Error on HR1
     318-322  F5.2  ---     HR2      *hardness ratio 2 (truncated to -9.99...99.99)
     324-327  F4.2  ---     e_HR2     Error on HR2
     329-334  I6    ct      CtA       Source net counts PHAch. 11-41  (~0.1-0.4 keV)
     336-341  I6    ct      CtB       Source net counts PHAch. 52-201 (~0.5-2.0 keV)
     343-348  I6    ct      CtC       Source net counts PHAch. 52-90  (~0.5-0.9 keV)
     350-355  I6    ct      CtD       Source net counts PHAch. 91-201 (~0.9-2.0 keV)
     357-362  F6.1  ct      e_CtA     Mean error on CtA
     364-369  F6.1  ct      e_CtB     Mean error on CtB
     371-376  F6.1  ct      e_CtC     Mean error on CtC
     378-383  F6.1  ct      e_CtD     Mean error on CtD
     385-388  F4.1  ---     cSpl      Reduced chi-square of power law fit
                                       to net spectrum (truncated at 99.9)
     390-393  F4.1  ---     cSRS      reduced chi-square of Raymond-Smith fit
                                       to net spectrum (truncated at 99.9)

    Note on S: this flag was added at CDS.
        The "short" version file, 2rxs_s.dat, can exactly be reconstructed
        from the "full" version file 2rxs.dat by a filter on this column,
        i.e. the file 2rxs_s.dat can be recreated by the Unix shell command
        grep '^....................S' 2rxs.dat > 2rxs_s.dat
    Note on 2RXP, m_2RXP: the name is NOT UNIQUE.
        Detections with the same position will have the same detection name;
        such detections may or may not represent the same astrophysical
        source. A letter (a,b,etc...) was added in the m_2RXP column for
        such duplicated duplicated names.
    Note on SrcFlags: flags with a dot (.) are turned off (false).
      c=CONFUSED    : close sources confused detection algorithm
      d=DET_STRUCT  : source near detector structure
      e=EXTENDED    : source is probably resolved
      f=FALSE_DET   : detection judged to be spurious
      i=INTEN_SUSP  : source intensity suspect
      l=LTC_SUSP    : source lightcurve may be suspect
      s=SPEC_SUSP   : source spectrum suspect
      m=MULT_DET    : complex emission split into individual sources
      n=NOT_CHECKED : source not checked visually by operator
      p=POS_SUSP    : source position suspect
      a=ASSOCIATED  : another source nearby may influence derived source
      v=VARFLG_SUSP : SASS variability flag suspect
      w=WITHIN_EXT  : source within extended emission
    Note on SeqFlags: flags with a dot (.) are turned off (false).
       D=DEFERRED   : Field not visually examined by operator [always off]
       A=ASP_SUSP   : Aspect solution suspect [always off]
       B=BKG_SUSP   : Background suspect
       E=EXT_EMIS   : Extended emission in field
       F=FIELD_FDET : False detections in field
       M=SRC_MISS   : Sources in field missed
       S=SLIS_MIS   : Source list missing
       X=EXPO_MAP   : Exposure map is not correct
    Note on Vig: the vignetting factor increases from 1 for sources detected
         on the axis to higher values when the source was detected off-axis.
    Note on DetFlags: the flags indicate the sliding window detection history
         using either the background map (M) or the local background (L),
         in the hard / soft and broad bands, and take the values
            0 = no detection, 1 = detection
         The order of the flags is:
           M-broad, L-broad, M-hard, L-hard, M-soft, L-soft
    Note on DetML: the value indicates in which band the source was detected:
          A =  PHA range 11-41  (~0.1-0.4 keV)
          B =  PHA range 52-201 (~0.5-2.0 keV)
          C =  PHA range 52-90  (~0.5-0.9 keV)
          D =  PHA range 91-201 (~0.9-2.0 keV)
          b or blank means 'broad'
    Note on Vflags: flags with a dot (.) are turned off (false).
          c = variability flag from chi-square test (CSQ_FLAG)
          k = variability flag from KS test         (KS_FLAG )
          u = variability flag from U test          (U_FLAG  )
          f = variability flag from FFT test        (FFT_FLAG)
    Note on HR1, HR2: The hardness ratios are defined by:
         HR1 = ( B - A ) / ( B + A )  , where
                 A = countrate in PHA range  11 -  41 (~0.1-0.4 keV)
                 B = countrate in PHA range  52 - 201 (~0.5-2.0 keV)
         HR2 = ( D - C ) / ( D + C )  , where
                 C = countrate in PHA range  52 -  90 (~0.5-0.9 keV)
                 D = countrate in PHA range  91 - 201 (~0.9-2.0 keV)
         (PHA = Pulse Height Amplitude)

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

       Bytes Format Units   Label     Explanations

       1- 24  A24   ---     RDF       Result Data directory and File
      26- 29  A4    ---     QCSite    Checker Site
      31- 34  A4    ---     QDname    Checker ID
      36- 41  I6   "YYMMDD" Cdate     Checking date
      52- 59  A8    ---     SeqFlags  [DABEFMSX.]  Sequence flags, as in 2rxp.dat
      63- 67  I5    s       ExpTime   Exposure Time
      70- 75  I6   "YYMMDD" Tbeg      Observation begin date
      77- 82  I6   "YYMMDD" Tend      Observation end date
      85- 87  I3    ---     Nsrc      Number of sources
      90- 91  I2    ---     Mis       Number of missed sources
         106  I1    ---     ---       [0] number of RRA table columns which contain
                                          undefined values for any of the sources
         108  I1    ---     ---       [0] N1 = number of undefined keywords
                                          from primary header
         111  I1    ---     ---       [0] N2 = number of undefined keywords
                                          from secondary header
         115  I1    ---     Nc        Statistics of confused sources
     117-118  I2    ---     Nd        Statistics of sources near detector
     120-121  I2    ---     Ne        Statistics of probably resolved sources
     122-124  I3    ---     Nf        Statistics of spurious detections
     125-127  I3    ---     Ni        Statistics of suspect source intensity
     128-130  I3    ---     Ns        Statistics of suspect lightcurve sources
     131-133  I3    ---     Nl        Statistics of suspect spectrum sources
     134-136  I3    ---     Nm        Statistics of split complex emission sources
     137-139  I3    ---     Nn        Statistics of sources not checked visually
     140-142  I3    ---     Np        Statistics of suspect source positions
     143-145  I3    ---     Na        Statistics of nearby associated sources
     146-148  I3    ---     Nv        Statistics of suspected variability
     149-151  I3    ---     Nw        Statistics of sources within extended emission
     153-160  F8.4  deg     RAdeg     J2000 Right Ascension of observation
     162-169  F8.4  deg     DEdeg     J2000 Declination of observation
     171-174  A4    ---     Site      Processing Site

    Global Notes:

    Note (G1): Some parameter values are undefined (blank) if the ML
               algorithm did not run (indicated by Mdet='M').
           NB: Maximum Liklihood never runs for sources further than
               20' from field center.

    History:
      * 29-Jun-2000: First copied from
        http://wave.xray.mpe.mpg.de/rosat/rra/rospspc
        The columns S and m_2RXP were added at CDS.
      * 22-Jul-2000: A new version was distributed (message from Jakob
        Englhauser, MPE, jer@xray.mpe.mpg.de) -- the previous version
        contained almost no source with Declination between 0 deg and
        -1 deg.
      * 22-Jul-2008: New ROSAT URLs : http://www.xray.mpe.mpg.de/rosat/rra
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    22-Jul-2000