IX/39 The XMM-Newton 2nd Serendipitous Source Catalogue (2XMM) (XMM-SSC, 2007)
The XMM-Newton 2nd Serendipitous Source Catalogue
XMM-Newton Survey Science Centre Consortium
<XMM-SSC, Leicester, UK (2007)>
ADC_Keywords: X-ray sources ; Surveys ;
Mission_Name: XMM
Description:
2XMM is the second comprehensive catalogue of serendipitous X-ray
sources from the European Space Agency's (ESA) XMM-Newton observatory.
The catalogue has been constructed by the XMM-Newton Survey Science
Centre (SSC) on behalf of ESA. It is the largest X-ray source
catalogue ever produced, containing almost twice as many discrete
sources as either the ROSAT survey or pointed catalogues.
The catalogue contains source detections drawn from 3491 XMM-Newton
EPIC observations covering a sky area of about 360 square degrees,
made between 2000 February 3 and 2007 March 31; all datasets were
publicly available by 2007 May 01 but not all public observations are
included in this catalogue. The catalogue contains 246897 X-ray source
detections which relate to 191870 unique X-ray sources.
The median flux in the total photon energy band (0.2-12keV) of the
catalogue detections is about 2.5x10-14erg/cm2/s (25aW/m2). About
20% of the sources have total fluxes below 10-14erg/cm2/s (10aW/m2).
The catalogue in its FITS version file (xmm2cat.fit) has 246897
entries made of 297 columns; a 'slim' version gathering the 39 most
relevant columns for the 191870 unique sources detected, is available
as an ascii table or a FITS binary table. In both versions, the
columns are fully described in the XMM-Newton User Guide available
from: http://xmmssc-www.star.le.ac.uk/Catalogue/UserGuide_xmmcat.html
The original names of these columns are included in the "Byte-by-byte
Description" below (uppercase names within parentheses)
Details about the construction of the catalogue can be found from the
XMM-Newton Survey Science Centre (http://xmmssc-www.star.le.ac.uk/)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
xmm2slim.dat 456 191870 The 2XMM catalog, "slim" version
xmm2slim.fit 2880 19526 The Catalogue as a FITS binary table
xmm2cat.fit 2880 116014 Full XMM-Newton 2nd Serendipitous Source Catalogue
(297 columns)
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See also:
http://xmmssc-www.star.le.ac.uk/Catalogue/2XMM : 2XMM Home Page
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2002)
http://xmmssc-www.star.le.ac.uk/ : XMM-Newton Survey Science Centre,
University of Leicester
http://xmm.vilspa.esa.es/xsa/ : XSA Centre at ESA's XMM-Newton SOC
http://xcatdb.u-strasbg.fr/xcat-db/ : XCAT-DB at SSC institute, Strasbourg
http://ledas-www.star.le.ac.uk/ : LEDAS, at the SSC institute,
University of Leicester
Byte-by-byte Description of file: xmm2slim.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Source [1,191870] (SRCID) Unique source index
8- 11 A4 --- --- [2XMM]
13- 28 A16 --- 2XMM (IAUNAME) Unique source name
30- 37 F8.4 deg RAdeg (SC_RA) Mean source right ascension (ICRS)
39- 46 F8.4 deg DEdeg (SC_DEC) Mean source declination (ICRS)
48- 51 F4.1 arcsec ePos (SC_POSERR) Mean error on position
53- 64 E12.6 mW/m2 Flux1 (SCEP1_FLUX) Mean flux in 0.2-0.5keV band
66- 74 E9.3 mW/m2 e_Flux1 (SCEP1FLUXERR) Mean error on Flux1
76- 87 E12.6 mW/m2 Flux2 (SCEP2_FLUX) Mean flux in 0.5-1.0keV band
89- 97 E9.3 mW/m2 e_Flux2 (SCEP2FLUXERR) Mean error on Flux2
99-110 E12.6 mW/m2 Flux3 (SCEP3_FLUX) Mean flux in 1.0-2.0keV band
112-120 E9.3 mW/m2 e_Flux3 (SCEP3FLUXERR) Mean error on Flux3
122-133 E12.6 mW/m2 Flux4 (SCEP4_FLUX) Mean flux in 2.0-4.5keV band
135-143 E9.3 mW/m2 e_Flux4 (SCEP4FLUXERR) Mean error on Flux4
145-156 E12.6 mW/m2 Flux5 (SCEP5_FLUX) Mean flux in 4.5-12keV band
158-166 E9.3 mW/m2 e_Flux5 (SCEP5FLUXERR) Mean error on Flux5
168-179 E12.6 mW/m2 Flux (SCEP8_FLUX) Mean flux in 0.2-12keV band
181-189 E9.3 mW/m2 e_Flux (SCEP8FLUXERR) Mean error on Flux
191-202 E12.6 mW/m2 Flux14 ? (SCEP9_FLUX) Mean flux in 0.5-4.5keV band
204-212 E9.3 mW/m2 e_Flux14 ? (SCEP9FLUXERR) Mean error on Flux14
214-220 F7.4 --- HR1 ? (SC_HR1) Hardness ratio of bands 1 and 2 (1)
222-228 F7.4 --- e_HR1 ? (SCHR1ERR) Mean error on HR1
230-236 F7.4 --- HR2 ? (SC_HR2) Hardness ratio of bands 2 and 3 (1)
238-244 F7.4 --- e_HR2 ? (SCHR2ERR) Mean error on HR2
246-252 F7.4 --- HR3 ? (SC_HR3) Hardness ratio of bands 3 and 4 (1)
254-260 F7.4 --- e_HR3 ? (SCHR3ERR) Mean error on HR3
262-268 F7.4 --- HR4 ? (SC_HR4) Hardness ratio of bands 4 and 5 (1)
270-276 F7.4 --- e_HR4 ? (SCHR4ERR) Mean error on HR4
278-286 E9.3 --- srcML (SCDETML) Source detection likelihood (2)
288-296 E9.3 --- extML (SCEXTML) Detection likelihood of the
extended source (3)
298-302 F5.3 --- Cst [0,1]? (SC_CHI2PROB) Constant probability (4)
304 I1 --- V [0,1] (SCVARFLAG) Variability flag (V=1)
306 I1 --- S [0,4] (SCSUMFLAG) summary flag (5)
308-309 I2 --- Nd (N_DETECTIONS) Number of detections
311-314 A4 --- --- [1XMM]
316-331 A16 --- 1XMM (MATCH_1XMM) Name of matched 1XMM source (6)
333-336 F4.2 arcsec o1XMM [0,3]? (SEP_1XMM) Distance of 1XMM source
338-343 I6 --- ID2XMMp ? (SRCID_2XMMP) ID of matched 2XMMp source (6)
345-349 A5 --- --- [2XMMp]
351-366 A16 --- 2XMMp (MATCH_2XMMP) Name of matched 2XMMp source (6)
368-371 F4.2 arcsec o2XMp [0,3]? (SEP_2XMMP) Distance of 2XMMp source
373-404 A32 --- --- [http://www.ledas.ac.uk/data/2XMM/]
405-456 A52 --- uLEDAS (LEDAS_URL) URL for details at LEDAS
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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 - 2.0 keV (narrow band)
3 = 2.0 - 4.5 keV (narrow band)
4 = 4.5 - 7.5 keV (narrow band)
5 = 7.5 - 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): within a radius of 3arcsec
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Acknowledgements:
It is a pleasure to thank Clive Page, who prepared the 'slim' version.
(End) Francois Ochsenbein [CDS] 03-Sep-2007