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J/A+A/534/A120        2XMMi/SDSS Galaxy Cluster Survey            (Takey+, 2011)

The 2XMMi/SDSS Galaxy Cluster Survey I. The first cluster sample and X-ray luminosity-temperature relation. Takey A., Schwope A., Lamer G. <Astron. Astrophys. 534, A120 (2011)> =2011A&A...534A.120T
ADC_Keywords: Surveys ; X-ray sources ; Galaxy catalogs Keywords: X-rays: galaxies: clusters - galaxies: clusters: general - surveys - catalogues Abstract: We present a catalogue of X-ray selected galaxy clusters and groups as a first release of the 2XMMi/SDSS Galaxy Cluster Survey. The survey is a search for galaxy clusters detected serendipitously in observations with XMM-Newton in the footprint of the Sloan Digital Sky Survey (SDSS). The main aims of the survey are to identify new X-ray galaxy clusters, investigate their X-ray scaling relations, identify distant cluster candidates, and study the correlation of the X-ray and optical properties. In this paper, we describe the basic strategy to identify and characterize the X-ray cluster candidates that currently comprise 1180 objects selected from the second XMM-Newton serendipitous source catalogue (2XMMi-DR3). Cross-correlation of the initial catalogue with recently published optically selected SDSS galaxy cluster catalogues yields photometric redshifts for 275 objects. Of these, 182 clusters have at least one member with a spectroscopic redshift from existing public data (SDSS-DR8). We developed an automated method to reprocess the XMM-Newton X-ray observations, determine the optimum source extraction radius, generate source and background spectra, and derive the temperatures and luminosities of the optically confirmed clusters. Here we present the X-ray properties of the first cluster sample, which comprises 175 clusters, among which 139 objects are new X-ray discoveries while the others were previously known as X-ray sources. For each cluster, the catalogue provides: two identifiers, coordinates, temperature, flux [0.5-2]keV, luminosity [0.5-2]keV extracted from an optimum aperture, bolometric luminosity L500, total mass M500, radius R500, and the optical properties of the counterpart. The first cluster sample from the survey covers a wide range of redshifts from 0.09 to 0.61, bolometric luminosities L500=1.9x1042-1.2x1045erg/s, and masses M500=2.3x1013-4.9x1014M. We extend the relation between the X-ray bolometric luminosity L500 and the X-ray temperature towards significantly lower T and L and still find that the slope of the linear L-T relation is consistent with values published for high luminosities. Description: The following table provide the first cluster sample catalogue that comprises 175 clusters of the 2XMMi/SDSS Galaxy Cluster Survey. Among them 139 objects are new X-ray discoveries while the others were previously known as X-ray sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 293 175 2XMMi/SDSS Galaxy Cluster Survey catalogue (I) table2.fits 2880 19 Table2 in FITS format
See also: IX/39 : XMM-Newton 2nd Serendipitous Source Catalogue (2XMM, 2007) IX/41 : XMM-Newton Serendipitous Source Catalogue 2XMMi-DR3 (XMM-SSC, 2010) : SDSS Home Page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Seq X-ray detection number in the 2XMMi-DR3 (1) 8- 11 A4 --- --- [2XMM] 12 A1 --- n_2XMM [I] when 2XMMi release (Cat. IX/41) 14- 29 A16 --- 2XMM X-ray IAU source name (1) 31- 39 F9.5 deg RAdeg Right ascension of X-ray detection (J2000) (1) 40- 48 F9.5 deg DEdeg Declination of the X-ray detection (J2000) (1) 50- 59 A10 --- ObsID XMM-Newton observation number (1) 61- 66 F6.4 --- z Redshift (2) 68- 71 F4.2 kpc/arcsec scale Scale at the cluster redshift 73- 78 F6.2 kpc Rap Optimal aperture radius 80- 86 F7.2 kpc R500 Estimated radius R500 88- 91 F4.2 keV Tap X-ray spectroscopic temperature within Rap 93- 96 F4.2 keV E_Tap Positive error in Tap 98-101 F4.2 keV e_Tap Negative error in Tap 103-108 F6.2 10-17W/m2 Fap Aperture X-ray flux in [0.5-2]keV 110-113 F4.2 10-17W/m2 E_Fap Positive error in Fap 115-118 F4.2 10-17W/m2 e_Fap Negative error in Fap 120-125 F6.2 10+35W Lap Aperture X-ray luminosity in [0.5-2]keV 127-131 F5.2 10+35W E_Lap Positive error in Lap 133-137 F5.2 10+35W e_Lap Negative error in Lap 139-145 F7.2 10+35W L500 X-ray bolometric luminosity within R500 147-152 F6.2 10+35W e_L500 Error in L500 154-158 F5.2 10+13Msun M500 Mass within R500 160-164 F5.2 10+13Msun e_M500 Error in M500 166-171 F6.4 10+22cm-2 nH Galactic HI column density 173-192 A20 --- objid Cluster Id in optical catalogues (3) 194-202 F9.5 deg RAodeg Right ascension of optical counterpart (J2000) (3) 204-212 F9.5 deg DEodeg Declination of the optical counterpart (J2000) (3) 214-219 F6.4 --- zp Photometric redshift (3) 221-226 F6.4 --- zs Spectroscopic redshift (4) 228-229 I2 --- Nzs Cluster members with spectra (4) 231-236 F6.2 kpc Offset Optical/X-ray offset 238-261 A24 --- OptCat Optical cluster catalogue names 262-291 A30 --- XrayClG ?=- Alternative X-ray cluster name(s) 292-293 I2 --- Ref ?=- Reference of known X-ray clusters (5)
Note (1): All these parameters are extracted from the 2XMMi-DR3 catalogue. Note (2): The cluster redshift is from col. (zs) or col. (zp). Note (3): These parameters are obtained from first catalogue in col.(opt-cats). Note (4): These parameters are extracted from SDSS-DR8 data. Note (5): Reference of the previously identified X-ray clusters as follows: 1 = Plionis et al., 2005ApJ...622L..17P 2 = Vikhlinin et al., 1998ApJ...502..558V, Cat. J/ApJ/502/558 3 = Cavagnolo et al., 2008ApJ...682..821C, Cat. J/ApJ/682/821 4 = Finoguenov et al., 2007ApJS..172..182F, Cat. J/ApJS/172/182 5 = Horner et al., 2008ApJS..176..374H, Cat. J/ApJS/176/374 6 = Dietrich et al., 2007A&A...470..821D, Cat. J/A+A/470/821 7 = Burenin et al., 2007ApJS..172..561B, Cat. J/ApJS/172/561 8 = Romer et al., 2000ApJS..126..209R, Cat. J/ApJS/126/209 9 = Basilakos et al., 2004MNRAS.351..989B 10 = Schuecker et al., 2004A&A...420...61S, Cat. J/A+A/420/61 11 = Sehgal et al., 2008ApJ...673..163S
Acknowledgements: Ali Takey, atakey(at)
(End) Patricia Vannier [CDS] 09-Sep-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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