IX/59 XMM-Newton Serendipitous Source Catalogue 4XMM-DR9 (Webb+, 2020)
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 2020A&A...641A.136W
=2020yCat.9059....0W 2020yCat.9059....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.
Using improved calibration and enhanced software we re-reduced all of
the 14041 XMM-Newton X-ray observations. 11204 observations contained
data with at least one detection and with these we created a new, high
quality version of the XMM-Newton serendipitous source catalogue,
4XMM-DR9.
4XMM-DR9 contains 810795 detections down to a detection significance
of 3σ, of which 550124 are unique sources, that cover
1152-degrees2 (2.85%) of the sky. Filtering 4XMM-DR9 to retain only
the cleanest sources with at least a 5σ detection significance
leaves 433612 detections. 99.6% of these detections have no pileup.
336 columns of information on each detection are provided, along with
images. The quality of the source detection is shown to have improved
significantly with respect to previous versions of the catalogues.
Spectra and lightcurves are also made available for more than 288000
of the brightest sources (36% of all detections).
Description:
The 4XMM-DR9 catalogue contains source detections drawn from 11204
XMM-Newton EPIC observations, covering an energy interval from 0.2keV
to 12keV. These observations were made between 2000 February 3 and
2019 February 26 and all datasets were publicly available by 2019
December 18, 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 3XMM-DR8 catalogue.
---------------------------------------------------------------------------
4XMM-DR9 3XMM-DR8 Increment
---------------------------------------------------------------------------
Number of observations 11204 10242 962
Number of 'clean' observations 9441 6496 2945
(i.e., observation class < 3)
Observing interval 01-Feb-00 03-Feb-00
26-Feb-19 30-Nov-17 1.25 yr
Sky coverage, taking overlaps into account
( ≥ 1ksec exposure) 1152 sq.deg 1089 sq.deg 63 sq.deg
Number of detections 810795 775153 35642
Number of 'clean' detections
(i.e., summary flag < 3) 713966 633733 80233
Number of unique sources 550124 531454 18670
Number of 'cleanest' (summary flag = 0, 17295 12256 5039
not in high-background fields) extended
detections
Number of detections with spectra 288521 173277 115244
Number of detections with timeseries 288282 173208 115074
Number of detections where probability 6696 5934 762
of timeseries being constant is
<1x10-5
---------------------------------------------------------------------------
The production and content of the 4XMM catalogue is described in the
the 4XMM-DR9 User Guide at
http://xmmssc.irap.omp.eu/Catalogue/4XMM-DR9/4XMM-DR9_Catalogue_User_Guide.html
The slimline version of the catalogue (file "xmm4r9s.dat") contains
one row per unique source (while the the main catalogue has one row
per detection) and thus has 550124 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.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
xmm4dr9s.dat 563 550124 The 4XMM-DR9 Catalog, "slim" version
summary.dat 160 11204 List of observations
xmm4dr9.fit 2880 49101 Full 4XMM-DR9 Catalog (810795 detections)
--------------------------------------------------------------------------------
See also:
IX/61 : 4XMM-DR9s serendipitous source catalogue from stacks (Traulsen+, 2020)
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: xmm4dr9s.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 I15 --- Source [200001101010001/208301918010109]
(SRCID) Unique source index
17- 20 A4 --- --- [4XMM]
22- 37 A16 --- 4XMM (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
368-377 F10.6 arcsec e_ext ? (SCEXTERR) Mean error on ext
379-390 E12.6 --- extML (SCEXTML) Detection likelihood of the
extended source (3)
392-399 F8.6 --- Cst [0/1]? (SC_CHI2PROB) Constant probability (4)
401-412 F12.6 --- Fvar ? (SC_FVAR) fractional excess variance of
the unique source (6)
414-425 F12.6 --- e_Fvar ? (SC_FVARERR) Mean error on Fvar
427 I1 --- V [0/1] (SCVARFLAG) Variability flag (V=1)
429 I1 --- S [0/4] (SCSUMFLAG) summary flag, 0=best (5)
431-442 E12.6 mW/m2 F8min (SCEP8_FMIN) Minimum flux in 0.2-12keV band
444-455 E12.6 mW/m2 e_F8min (SCEP8FMINERR) Mean error on F8min
457-468 E12.6 mW/m2 F8max (SCEP8_FMAX) Maximum flux in 0.2-12keV band
470-481 E12.6 mW/m2 e_F8max (SCEP8FMAXERR) Mean error on F8max
483-492 F10.4 d MJD0 [51575/58541] (MJD_FIRST) Date of first
observation (MJD)
494-503 F10.4 d MJD1 [51575/58542] (MJD_LAST) Date of last
observation (MJD)
505-506 I2 --- Nd [1/69]? (N_DETECTIONS) Number of detections
508 I1 --- c [0/1] (CONFUSED) Confusion flag (7)
510-563 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): χ2 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-σ error
circle of a detection within this unique source overlaps the 3-σ
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 [27/3519] (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- 52 F10.6 deg PApnt (PA_PNT) Actual pointed position of the
optical axis
54- 72 A19 --- Target (TARGET) Target name
74- 83 F10.4 d MJD0 (MJD_START) Start observation date
85- 94 F10.4 d MJD1 (MJD_STOP) End observation date
96 I1 --- Q [0/5] (OBS_CLASS) Observations quality (1)
98-100 I3 --- Nd [1/738] (NDET) Number of detections in field
102-104 I3 --- Ng [0/419] (NDETGOOD) Number of good detections
in field
106 I1 --- Np [1/5]? (PN_NEXP) Number of PN exposures merged
108-110 A3 --- f.PN (PN_FILT) Filter of the PN exposure(s) (2)
112-115 A4 --- m.PN (PN_MODE) Mode of the PN exposure(s) (3)
117-122 I6 s t.PN ?=- (PN_TEXP) Total PN exposure time
124 I1 --- N1 [1/5]? (M1_NEXP) Number of M1 exposures merged
126-128 A3 --- f.M1 (M1_FILT) Filter of the M1 exposure(s) (2)
130-134 A5 --- m.M1 (M1_MODE) Mode of the M1 exposures (3)
136-141 I6 s t.M1 ?=- (M1_TEXP) Total M1 exposure time
143 I1 --- N2 [1/5]? (M2_NEXP) Number of M2 exposures merged
145-147 A3 --- f.M2 (M2_FILT) Filter of the M2 exposure(s) (2)
149-153 A5 --- m.M2 (M2_MODE) Mode of the M2 exposures (3)
155-160 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): 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-DR9/4XMM_DR9.html
(End) Patricia Vannier [CDS] 16-Jul-2020