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Detailed Description of IX/50 :
XMM-Newton Serendipitous Source Catalogue 3XMM-DR6 (XMM-SSC, 2016)

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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/50        XMM-Newton Serendipitous Source Catalogue 3XMM-DR6  (XMM-SSC, 2016)
================================================================================
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)>
   =2016yCat.9050....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-DR6 catalogue contains source detections drawn from 9160
    XMM-Newton EPIC observations, covering an energy interval from 0.2keV
    to 12keV. These observations were made between 2000 February 3 and
    2015 June 4 and all datasets were publicly available by 2016 January
    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-DR4 catalogue.

    ----------------------------------------------------------------------------
                                            3XMM-DR6    3XMM-DR5     Increment
    ----------------------------------------------------------------------------
    Number of observations                    9160        7781       1379
    Number of 'clean' observations
      (i.e., observation class < 3)           5947        4735       1212
    Observing interval                      03-Feb-00   03-Feb-00    2.5yr
                                            04-Jun-15   20-Dec-13
    Sky coverage, taking overlaps into account
      ( >=1ks exposure)                     982sq.deg   877sq.deg    105sq.deg
    Number of detections                    678680      565962      112718
    Number of 'clean' detections
           (i.e., summary flag < 3)         552991      456904       96087
    Number of unique sources                468440      396910       71530
    Number of 'cleanest' (summary flag = 0,
    not in high-background fields) extended
                             detections      11066        9082        1984
    Number of detections with spectra       149968      133032       16936
    Number of detections with timeseries    149968      133025       16943
    Number of detections where probability
     of timeseries being constant is
     <1x10-5                                5238        4668         570
    ----------------------------------------------------------------------------

  The production and content of the 3XMM catalogue is described in the
   the 3XMM-DR6 User Guide at
 http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR6/3XMM-DR6_Catalogue_User_Guide.html

    The "slim" version of the catalogue (file "xmm3r6s.dat") contains one
    row per unique source, while the the main catalogue has one row per
    detection. This slim version includes 44 columns, essentially those
    containing information about the unique sources, while the full
    catalogue (file "xmm3r6.fit") describes all detections with 323
    columns. The slim version also contains a column with links to the
    summary pages in the IRAP catalogue archive.

    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.

    A separate file "summary.dat" contains the key details about the
    observations used in the construction of the 3XMM-DR6 catalogue.

File Summary:

FileName Lrecl Records Explanations
× 80 . This file × ReadMe 80 . This file × xmm3r6s.dat 459 468440 The 3XMM-DR6 Catalog, "slim" version × summary.dat 135 9159 List of observations × xmm3r6.fit 2880 349530 Full 3XMM-DR6 Catalog (678680 detections)
See also: http://xmmssc-www.star.le.ac.uk/Catalogue : XMM-Newton Home Page http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR6/3XMM_DR6.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: xmm3r6s.dat
Bytes Format Units Label Explanations
1- 15 I15 --- Source [200001101010001/207705805010122] (SRCID) Unique source index 17- 20 A4 --- --- [3XMM] 22- 37 A16 --- 3XMM (IAUNAME) Unique source name (JHHMMSS.s+DDMMSS) 39- 47 F9.5 deg RAdeg (SC_RA) Mean source right ascension (ICRS) 49- 57 F9.5 deg DEdeg (SC_DEC) Mean source declination (ICRS) 59- 63 F5.2 arcsec ePos [0.03/20] (SC_POSERR) Mean error on position 65- 73 E9.3 --- srcML (SCDETML) Source detection likelihood (2) 75- 85 E11.5 mW/m2 Flux1 (SCEP1_FLUX) Mean flux in 0.2-0.5keV band 87- 95 E9.3 mW/m2 e_Flux1 (SCEP1FLUXERR) Mean error on Flux1 97-107 E11.5 mW/m2 Flux2 (SCEP2_FLUX) Mean flux in 0.5-1.0keV band 109-117 E9.3 mW/m2 e_Flux2 (SCEP2FLUXERR) Mean error on Flux2 119-129 E11.5 mW/m2 Flux3 (SCEP3_FLUX) Mean flux in 1.0-2.0keV band 131-139 E9.3 mW/m2 e_Flux3 (SCEP3FLUXERR) Mean error on Flux3 141-151 E11.5 mW/m2 Flux4 (SCEP4_FLUX) Mean flux in 2.0-4.5keV band 153-161 E9.3 mW/m2 e_Flux4 (SCEP4FLUXERR) Mean error on Flux4 163-173 E11.5 mW/m2 Flux5 (SCEP5_FLUX) Mean flux in 4.5-12keV band 175-183 E9.3 mW/m2 e_Flux5 (SCEP5FLUXERR) Mean error on Flux5 185-195 E11.5 mW/m2 Flux8 (SCEP8_FLUX) Mean flux in 0.2-12keV band 197-205 E9.3 mW/m2 e_Flux8 (SCEP8FLUXERR) Mean error on Flux8 207-217 E11.5 mW/m2 Flux9 ? (SCEP9_FLUX) Mean flux in 0.5-4.5keV band 219-227 E9.3 mW/m2 e_Flux9 ? (SCEP9FLUXERR) Mean error on Flux9 229-239 E11.5 mW/m2 F8min (SCEP8_FMIN) Minimum flux in 0.5-4.5keV band 241-249 E9.3 mW/m2 e_F8min (SCEP8FMINERR) Mean error on F8min 251-261 E11.5 mW/m2 F8max (SCEP8_FMAX) Maximum flux in 0.5-4.5keV band 263-271 E9.3 mW/m2 e_F8max (SCEP8FMAXERR) Mean error on F8max 273-278 F6.3 --- HR1 [-1/1]? (SC_HR1) Hardness ratio, bands 1,2 (1) 280-285 F6.3 --- e_HR1 ? (SCHR1ERR) Mean error on HR1 287-292 F6.3 --- HR2 [-1/1]? (SC_HR2) Hardness ratio, bands 2,3 (1) 294-299 F6.3 --- e_HR2 ? (SCHR2ERR) Mean error on HR2 301-306 F6.3 --- HR3 [-1/1]? (SC_HR3) Hardness ratio, bands 3,4 (1) 308-313 F6.3 --- e_HR3 ? (SCHR3ERR) Mean error on HR3 315-320 F6.3 --- HR4 [-1/1]? (SC_HR4) Hardness ratio, bands 4,5 (1) 322-327 F6.3 --- e_HR4 ? (SCHR4ERR) Mean error on HR4 329-333 F5.1 arcsec ext (SC_EXTENT) Total band extent 335-343 E9.3 --- extML (SCEXTML) Detection likelihood of the extended source (3) 345-350 F6.3 --- Cst [0/1]? (SC_CHI2PROB) Constant probability (4) 352 I1 --- V [0/1] (SCVARFLAG) Variability flag (V=1) 354 I1 --- S [0/4] (SCSUMFLAG) summary flag, 0=best (5) 356-365 F10.4 d MJD0 [51577/57178] (MJD_FIRST) Date of first observation (MJD) 367-376 F10.4 d MJD1 [51577/57178] (MJD_LAST) Date of last observation (MJD) 378-387 F10.6 --- Fvar ? (SC_FVAR) fractional excess variance of the unique source (6) 389-399 F11.6 --- e_Fvar ? (SC_FVARERR) Mean error on Fvar 401-402 I2 --- Nd [1/50] (N_DETECTIONS) Number of detections 404 I1 --- c [0/1] (CONFUSED) Confusion flag (7) 406-459 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 [28/2836] (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- 29 F9.5 deg RAdeg (RA) field Right Ascension (J2000) 31- 39 F9.5 deg DEdeg (DEC) field Declination (J2000) 41- 68 A28 --- Target (TARGET) name 70 I1 --- Q [0/5] (OBS_CLASS) Observations quality (1) 72- 74 I3 --- Nd [1/731] (NDET) Number of detections in field 76- 78 I3 --- Ng [0/391] (NDETGOOD) Number of good detections in field 80 I1 --- Np [1/4]? (PN_NEXP) Number of PN exposures merged 82- 84 A3 --- f.PN (PN_FILT) Filter of the PN exposure(s) (2) 86- 90 A5 --- m.PN (PN_MODE) Mode of the PN exposure(s) (3) 92- 97 I6 s t.PN ?=--- (PN_TEXP) Total PN exposure time 99 I1 --- N1 [1/5]? (M1_NEXP) Number of M1 exposures merged 101-103 A3 --- f.M1 (M1_FILT) Filter of the M1 exposure(s) (2) 105-109 A5 --- m.M1 (M1_MODE) Mode of the M1 exposures (3) 111-116 I6 s t.M1 ?=--- (M1_TEXP) Total M1 exposure time 118 I1 --- N2 [1/5]? (M2_NEXP) Number of M2 exposures merged 120-122 A3 --- f.M2 (M2_FILT) Filter of the M2 exposure(s) (2) 124-128 A5 --- m.M2 (M2_MODE) Mode of the M2 exposures (3) 130-135 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 http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR6/3XMM_DR6.html ================================================================================ (End) Patricia Vannier [CDS] 22-Sep-2016