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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 293 175 2XMMi/SDSS Galaxy Cluster Survey catalogue (I)
table2.fits 2880 19 Table2 in FITS format
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See also:
IX/39 : XMM-Newton 2nd Serendipitous Source Catalogue (2XMM, 2007)
IX/41 : XMM-Newton Serendipitous Source Catalogue 2XMMi-DR3 (XMM-SSC, 2010)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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 2005ApJ...622L..17P
2 = Vikhlinin et al., 1998ApJ...502..558V 1998ApJ...502..558V, Cat. J/ApJ/502/558
3 = Cavagnolo et al., 2008ApJ...682..821C 2008ApJ...682..821C, Cat. J/ApJ/682/821
4 = Finoguenov et al., 2007ApJS..172..182F 2007ApJS..172..182F, Cat. J/ApJS/172/182
5 = Horner et al., 2008ApJS..176..374H 2008ApJS..176..374H, Cat. J/ApJS/176/374
6 = Dietrich et al., 2007A&A...470..821D 2007A&A...470..821D, Cat. J/A+A/470/821
7 = Burenin et al., 2007ApJS..172..561B 2007ApJS..172..561B, Cat. J/ApJS/172/561
8 = Romer et al., 2000ApJS..126..209R 2000ApJS..126..209R, Cat. J/ApJS/126/209
9 = Basilakos et al., 2004MNRAS.351..989B 2004MNRAS.351..989B
10 = Schuecker et al., 2004A&A...420...61S 2004A&A...420...61S, Cat. J/A+A/420/61
11 = Sehgal et al., 2008ApJ...673..163S 2008ApJ...673..163S
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Acknowledgements:
Ali Takey, atakey(at)aip.de
(End) Patricia Vannier [CDS] 09-Sep-2011