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

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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/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