ACDS V10.0 - Detailed Description of IX/69

ACDS V10.0 - Sat Jan 18 00:39:41 CET 2025

| # Detailed Description of IX/69 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR13 (Webb+, 2023) |

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/69          XMM-Newton Serendipitous Source Catalogue 4XMM-DR13 (Webb+, 2023)
    ================================================================================
    The XMM-Newton serendipitous survey.
    IX. The fourth XMM-Newton serendipitous source catalogue.
        Webb N.A., Coriat M., Traulsen I., Ballet J., Motch C., Carrera F.J.,
        Koliopanos F., Authier J., de la Calle I., Ceballos M.T., Colomo E.,
        Chuard D., Freyberg M., Garcia T., Kolehmainen M., Lamer G., Lin D.,
        Maggi P., Michel L., Page C.G., Page M.J., Perea-Calderon J.V.,
        Pineau F.-X., Rodriguez P., Rosen S.R., Santos Lleo M., Saxton R.D.,
        Schwope A., Tomas L., Watson M.G., Zakardjian A.
        <XMM-SSC, Leicester, UK; Astron. Astrophys. 641, A136 (2020) >
       =2020A&A...641A.136W
       =2023yCat.9069....0X
    ================================================================================
    ADC_Keywords: X-ray sources ; Surveys

    Mission_Name: XMM

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

    Abstract:
        Sky surveys produce enormous quantities of data on extensive regions
        of the sky. The easiest way to access this information is through
        catalogues of standardised data products. XMM-Newton has been
        surveying the sky in the X-ray, ultra-violet and optical bands for 22
        years.

        The XMM-Newton Survey Science Centre has been producing standardised
        data products and catalogues to facilitate access to the serendipitous
        X-ray sky.

        4XMM-DR13 contains 983948 X-ray detections above the processing
        likelihood threshold of 6. These X-ray detections relate to 656997
        unique X-ray sources.

    Description:
        The 4XMM-DR13 catalogue contains source detections drawn from 13243
        XMM-Newton EPIC observations, covering an energy interval from 0.2keV
        to 12keV. These observations were made between 2000 February 3 and
        2022 December 31 and all datasets were publicly available by 2022
        December 31, but not all public observations are included in this
        catalogue.

        The following table gives an overview of the statistics of the
        catalogue in comparison with the 4XMM-DR11 catalogue.

       ---------------------------------------------------------------------------
                                                4XMM-DR13    4XMM-DR12  Increment
       ---------------------------------------------------------------------------
       Number of observations                    13243       12712        531
       Number of 'clean' observations            10895       10543        352
        (i.e., observation class < 3)
       Observing interval                       03-Feb-00    03-Feb-00
                                                31-Dec-22    31-Dec-20    1 yr
       Sky coverage, taking overlaps into account
        ( >= 1ksec exposure)                    1328 sq.deg  1283 sq.deg  45 sq.deg
       Number of detections                      983948      939270       44678
       Number of 'clean' detections
         (i.e., summary flag < 3)                854095      821953       32142
       Number of unique sources                  656997      630347       26650
       Number of 'cleanest' (summary flag = 0,    20971       20169         802
        not in high-background fields) extended
        detections
       Number of detections with spectra         353821      337058       16763
       Number of detections with timeseries      535386      336776       16762
       Number of detections where probability      8029        7697         332
        of timeseries being constant is
        <1x10-5

       The production and content of the 4XMM catalogue is described in the
         the 4XMM-DR13 User Guide at
         http://xmmssc.irap.omp.eu/Catalogue/
         4XMM-DR13/4XMM-DR13CatalogueUser_Guide.html

        The slimline version of the catalogue (file "xmm4d13s.dat") contains
        one row per unique source (while the the main catalogue has one row
        per detection) and thus has 656997 rows. There are 45 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.

        Should you use the catalogues 4XMM-DR13 or 4XMM-DR13s for your
        research and publish the results, please use the acknowledgement below
        and cite the relevant paper, Webb et al. (2020A&A...641A.136W).

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × xmm4d13s.dat     563   656997   The 4XMM-DR13 Catalog, "slim" version
    × xmm4d13s.fit    2880    58639   Fits version of 4XMM-DR13 Catalog, "slim"
    × summary.dat      160    13243   List of observations
    × xmm4d13.fit     2880   512199   Full 4XMM-DR13 Catalog (854095 detections)

    See also:
      IX/68 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR12 (Webb+, 2023)
      IX/64 : 4XMM-DR10s serendipitous source catalogue from stacks (Traulsen+ 2022)

      http://xmmssc-www.star.le.ac.uk/Catalogue : XMM-Newton Home Page
      http://xmmssc.irap.omp.eu/Catalogue/4XMM-DR9/4XMM_DR9.html :
                                                              4XMM 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
      B/xmm : XMM-Newton Observation Log   (XMM-Newton Science Operation Center)

    Byte-by-byte Description of file:  xmm4d13s.dat

       Bytes Format Units   Label     Explanations

       1- 15  I15   ---     Source    [200001101010001/209119905010217]
                                     Unique source index (SRCID)
      17- 20  A4    ---     ---       [4XMM]
      22- 37  A16   ---     4XMM      Unique source name (JHHMMSS.s+DDMMSS) (IAUNAME)
      39- 48  F10.6 deg     RAdeg     Mean source right ascension (ICRS) (SC_RA)
      50- 59  F10.6 deg     DEdeg     Mean source declination (ICRS) (SC_DEC)
      61- 69  F9.6  arcsec  ePos      [0.03/20] Mean error on position (SC_POSERR)
      71- 82  E12.6 ---     srcML     Source detection likelihood (SCDETML) (2)
      84- 95  E12.6 mW/m2   Flux1     Mean flux in 0.2-0.5keV band (SCEP1_FLUX)
      97-108  E12.6 mW/m2   e_Flux1   Mean error on Flux1 (SCEP1FLUXERR)
     110-121  E12.6 mW/m2   Flux2     Mean flux in 0.5-1.0keV band (SCEP2_FLUX)
     123-134  E12.6 mW/m2   e_Flux2   Mean error on Flux2 (SCEP2FLUXERR)
     136-147  E12.6 mW/m2   Flux3     Mean flux in 1.0-2.0keV band (SCEP3_FLUX)
     149-160  E12.6 mW/m2   e_Flux3   Mean error on Flux3 (SCEP3FLUXERR)
     162-173  E12.6 mW/m2   Flux4     Mean flux in 2.0-4.5keV band (SCEP4_FLUX)
     175-186  E12.6 mW/m2   e_Flux4   Mean error on Flux4 (SCEP4FLUXERR)
     188-199  E12.6 mW/m2   Flux5     Mean flux in 4.5-12keV band (SCEP5_FLUX)
     201-212  E12.6 mW/m2   e_Flux5   Mean error on Flux5 (SCEP5FLUXERR)
     214-225  E12.6 mW/m2   Flux8     Mean flux in 0.2-12keV band (SCEP8_FLUX)
     227-238  E12.6 mW/m2   e_Flux8   Mean error on Flux8 (SCEP8FLUXERR)
     240-251  E12.6 mW/m2   Flux9     ?=- Mean flux in 0.5-4.5keV band (SCEP9_FLUX)
     253-264  E12.6 mW/m2   e_Flux9   ?=- Mean error on Flux9 (SCEP9FLUXERR)
     266-274  F9.6  ---     HR1       [-1/1]?=- Hardness ratio, bands 1,2 (SC_HR1) (1)
     276-287  E12.6 ---     e_HR1     ?=- Mean error on HR1 (SCHR1ERR)
     289-297  F9.6  ---     HR2       [-1/1]?=- Hardness ratio, bands 2,3 (SC_HR2) (1)
     299-310  E12.6 ---     e_HR2     ?=- Mean error on HR2 (SCHR2ERR)
     312-320  F9.6  ---     HR3       [-1/1]?=- Hardness ratio, bands 3,4 (SC_HR3) (1)
     322-333  E12.6 ---     e_HR3     ?=- Mean error on HR3 (SCHR3ERR)
     335-343  F9.6  ---     HR4       [-1/1]?=- Hardness ratio, bands 4,5 (SC_HR4) (1)
     345-356  E12.6 ---     e_HR4     ?=- Mean error on HR4 (SCHR4ERR)
     358-366  F9.6  arcsec  ext       Total band extent (SC_EXTENT)
     368-377  F10.6 arcsec  e_ext     ?=- Mean error on ext (SCEXTERR)
     379-390  E12.6 ---     extML     Detection likelihood of the
                                     extended source (SCEXTML) (3)
     392-399  F8.6  ---     Cst       [0/1]?=- Constant probability (SC_CHI2PROB) (4)
     401-412  F12.6 ---     Fvar      ?=- fractional excess variance of
                                     the unique source (SC_FVAR) (6)
     414-425  F12.6 ---     e_Fvar    ?=- Mean error on Fvar (SC_FVARERR)
         427  I1    ---     V         [0/1] Variability flag (V=1) (SCVARFLAG)
         429  I1    ---     S         [0/4] summary flag, 0=best (SCSUMFLAG) (5)
     431-442  E12.6 mW/m2   F8min     Minimum flux in 0.5-4.5keV band (SCEP8_FMIN)
     444-455  E12.6 mW/m2   e_F8min   Mean error on F8min (SCEP8FMINERR)
     457-468  E12.6 mW/m2   F8max     Maximum flux in 0.5-4.5keV band (SCEP8_FMAX)
     470-481  E12.6 mW/m2   e_F8max   Mean error on F8max (SCEP8FMAXERR)
     483-492  F10.4 d       MJD0      [51575/59912] Date of first observation (MJD)
                                     (MJD_FIRST)
     494-503  F10.4 d       MJD1      [51575/59913] Date of last observation (MJD)
                                     (MJD_LAST)
     505-506  I2    ---     Nd        [1/90]? Number of detections (N_DETECTIONS)
         508  I1    ---     c         [0/1] (CONFUSED) Confusion flag (CONFUSED) (7)
     510-563  A54   ---     uIRAP     URL for details at IRAP (WEBPAGE_URL)

    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      [27/4207] Satellite revolution number (REVOLUT)
       6- 15  I010  ---     ObsID    XMM Observation number (Cat. B/xmm) (OBS_ID)
      17- 19  I03   ---     iODF     [1/10] Data File (ODF) number (ODF_VERS)
      21- 30  F10.6 deg     RAdeg    field Right Ascension (J2000) (RA)
      32- 41  F10.6 deg     DEdeg    field Declination (J2000) (DEC)
      43- 52  F10.6 deg     PApnt    Actual pointed position of the optical axis
                                      (PA_PNT)
      54- 72  A19   ---     Target   Target name (TARGET)
      74- 83  F10.4 d       MJD0     Start observation date (MJD_START)
      85- 94  F10.4 d       MJD1     End observation date (MJD_STOP)
          96  I1    ---     Q        [0/5] Observations quality (OBS_CLASS) (1)
      98-100  I3    ---     Nd       [1/738] Number of detections in field (NDET)
     102-104  I3    ---     Ng       [0/419] Number of good detections in field
                                      (NDETGOOD)
         106  I1    ---     Np       [1/5]? Number of PN exposures merged (PN_NEXP)
     108-110  A3    ---     f.PN     Filter of the PN exposure(s) (PN_FILT) (2)
     112-115  A4    ---     m.PN     Mode of the PN exposure(s) (PN_MODE) (3)
     117-122  I6    s       t.PN     ?=- Total PN exposure time (PN_TEXP)
         124  I1    ---     N1       [1/5]? Number of M1 exposures merged (M1_NEXP)
     126-128  A3    ---     f.M1     Filter of the M1 exposure(s) (M1_FILT) (2)
     130-134  A5    ---     m.M1     Mode of the M1 exposures (M1_MODE) (3)
     136-141  I6    s       t.M1     ?=- Total M1 exposure time (M1_TEXP)
         143  I1    ---     N2       [1/5]? Number of M2 exposures merged (M2_NEXP)
     145-147  A3    ---     f.M2     Filter of the M2 exposure(s) (M2_FILT) (2)
     149-153  A5    ---     m.M2     Mode of the M2 exposures (M2_MODE) (3)
     155-160  I6    s       t.M2     ?=- Total M2 exposure time (M2_TEXP)

    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): EPIC camera observing modes of catalogue observations:
      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
      PN modes:
       PFWE = Prime Full Window Extended
        PFW = Prime Full Window
        PLW = Prime Large Window

    History:
         Copied at http://xmmssc.irap.omp.eu/Catalogue/4XMM-DR13/4XMM_DR13.html
    ================================================================================
    (End)                                      Patricia Vannier [CDS]    10-Aug-2023