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Detailed Description of IX/65 :
XMM-Newton Serendipitous Source Catalogue 4XMM-DR11 (Webb+, 2022)

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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/65          XMM-Newton Serendipitous Source Catalogue 4XMM-DR11 (Webb+, 2022)
================================================================================
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
   =2022yCat.9065....0W
================================================================================
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 20
    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-DR11 contains 895415 X-ray detections above the processing
    likelihood threshold of 6. These X-ray detections relate to 602543
    unique X-ray sources. A significant fraction of sources (117124, 19%)
    have more than one detection in the catalogue (up to 74 repeat
    observations in the most extreme case).

Description:
    The 4XMM-DR11 catalogue contains source detections drawn from 12210
    XMM-Newton EPIC observations, covering an energy interval from 0.2keV
    to 12keV. These observations were made between 2000 February 3 and
    2020 December 17 and all datasets were publicly available by 2020
    December 17, 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-DR10 catalogue.

    ---------------------------------------------------------------------------
                                            4XMM-DR11   4XMM-DR10     Increment
    ---------------------------------------------------------------------------
    Number of observations                  12210        11647          563
    Number of 'clean' observations          10247         9784          463
     (i.e., observation class < 3)
    Observing interval                      03-Feb-00   03-Feb-00
                                            17-Dec-20   14-Dec-19       1 yr
    Sky coverage, taking overlaps into account
    ( >= 1ksec exposure)                    1239 sq.deg  1192 sq.deg   47 sq.deg
    Number of detections                     895415     849991         45424
    Number of 'clean' detections
    (i.e., summary flag < 3)                 787963     748670         39293
    Number of unique sources                 602543     575158         27385
    Number of 'cleanest' (summary flag = 0,   19077      18093           984
    not in high-background fields) extended
    detections
    Number of detections with spectra        319565     303023         16542
    Number of detections with timeseries     319292     302773         16519
    Number of detections where probability     7283       6972           311
     of timeseries being constant is
     <1x10-5
    ---------------------------------------------------------------------------

    The production and content of the 4XMM catalogue is described in the
      the 4XMM-DR11 User Guide at
     http://xmmssc.irap.omp.eu/Catalogue/ 
     4XMM-DR11/4XMM-DR11CatalogueUser_Guide.html

    The slimline version of the catalogue (file "xmm4d11s.dat") contains
    one row per unique source (while the the main catalogue has one row
    per detection) and thus has 602543 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-DR11 or 4XMM-DR11s 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 × xmm4d11s.dat 563 602543 The 4XMM-DR11 Catalog, "slim" version × xmm4d11s.fit 2880 53779 Fits version of 4XMM-DR11 Catalog, "slim" × summary.dat 160 12210 List of observations × xmm4d11.fit 2880 466110 Full 4XMM-DR11 Catalog (895415 detections)
See also: IX/63 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR10 (Webb+, 2022) 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: xmm4d11s.dat
Bytes Format Units Label Explanations
1- 15 I15 --- Source [200001101010001/208711912010092] 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 [51575/59200] Date of first observation (MJD) (MJD_FIRST) 494-503 F10.4 d MJD1 [51575/59201] Date of last observation (MJD) (MJD_LAST) 505-506 I2 --- Nd [1/80]? 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 [27/3850] 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-DR11/4XMM_DR11.html ================================================================================ (End) Patricia Vannier [CDS] 20-Apr-2022