J/A+A/558/A75 2XMMi/SDSS Galaxy Cluster Survey. II. (Takey+, 2013)
The 2XMMi/SDSS Galaxy Cluster Survey.
II. The optically confirmed cluster sample and the LX-T relation.
Takey A., Schwope A., Lamer G.
<Astron. Astrophys. 558, A75 (2013)>
=2013A&A...558A..75T 2013A&A...558A..75T
ADC_Keywords: Surveys ; X-ray sources ; Galaxy catalogs
Keywords: X-rays: galaxies: clusters - galaxies: clusters: general - surveys -
catalogs - techniques: photometric - techniques: spectroscopic
Abstract:
We compile a sample of X-ray-selected galaxy groups and clusters from
the XMM-Newton serendipitous source catalogue (2XMMi-DR3) with optical
confirmation and redshift measurement from the Sloan Digital Sky
Survey (SDSS). The X-ray cluster candidates were selected from the
2XMMi-DR3 catalogue in the footprint of the SDSS-DR7. We developed a
finding algorithm to search for overdensities of galaxies at the
positions of the X-ray cluster candidates in the photometric redshift
space and to measure the redshifts of the clusters from the SDSS data.
The detection algorithm provides the photometric redshift of 530
galaxy clusters. Of these, 310 clusters have a spectroscopic redshift
for at least one member galaxy. About 75 percent of the optically
confirmed cluster sample are newly discovered X-ray clusters.
Moreover, 301 systems are known as optically selected clusters in the
literature while the remainder are new discoveries in X-ray and
optical bands. The optically confirmed cluster sample spans a wide
redshift range 0.03-0.70 (median z=0.32).
In this paper, we present the catalogue of X-ray-selected galaxy
groups and clusters from the 2XMMi/SDSS galaxy cluster survey. The
catalogue has two subsamples: (i) a cluster sample comprising 345
objects with their X-ray spectroscopic temperature and flux from the
spectral fitting, and (ii) a cluster sample consisting of 185 systems
with their X-ray flux from the 2XMMi-DR3 catalogue, because their
X-ray data are insufficient for spectral fitting. The updated LX-T
relation of the current sample with X-ray spectroscopic parameters is
presented. We see no evidence for evolution in the slope and intrinsic
scatter of the LX-T relation with redshift when excluding the
low-luminosity groups
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 294 345 The 2XMMi/SDSS Galaxy Cluster Survey (II),
sub-sample 1 (TX and FX from spectral fitting)
table1.fits 2880 30 Table1 in FITS format
table2.dat 259 185 The 2XMMi/SDSS Galaxy Cluster Survey (II),
sub-sample 2 (TX and FX from 2XMMi-DR3 catalog)
table2.fits 2880 16 Table2 in FITS format
refs.dat 65 60 References
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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)
J/A+A/534/A120 : 2XMMi/SDSS Galaxy Cluster Survey (Takey+, 2011)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.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 (G1)
8- 11 A4 --- --- [2XMM]
12 A1 --- n_2XMM [I] when 2XMMi release (Cat. IX/41)
14- 29 A16 --- 2XMM IAU name given in the 2XMMi-DR3 cat. (G1)
31- 39 F9.5 deg RAdeg X-ray detection right ascension (J2000) (G1)
41- 49 F9.5 deg DEdeg X-ray detection declination (J2000) (G1)
51- 60 A10 --- ObsID XMM-Newton observation number (G1)
62- 67 F6.4 --- z Cluster redshift (G2)
69- 72 F4.2 kpc/arcsec Scale Scale at the cluster redshift
74- 79 F6.2 kpc Rap Optimal aperture radius
81- 87 F7.2 kpc R500 Estimated radius R500
89- 92 F4.2 keV Tap X-ray spectroscopic temperature within Rap
94- 97 F4.2 keV E_Tap Positive error in Tap
99-102 F4.2 keV e_Tap Negative error in Tap
104-109 F6.2 10-17W/m2 Fap Aperture X-ray flux in [0.5-2]keV band
(in 10-14erg/cm2/s)
111-114 F4.2 10-17W/m2 E_Fap Positive error in Fap
116-119 F4.2 10-17W/m2 e_Fap Negative error in Fap
121-126 F6.2 10+35W Lap Aperture X-ray luminosity in [0.5-2]keV band
(in 1042erg/s)
128-132 F5.2 10+35W E_Lap Positive error in Lap
134-138 F5.2 10+35W e_Lap Negative error in Lap
140-146 F7.2 10+35W L500 X-ray bolometric luminosity within R500
(in 1042erg/s)
148-153 F6.2 10+35W e_L500 Error in L500
155-159 F5.2 10+13Msun M500 Mass within R500
161-165 F5.2 10+13Msun e_M500 Error in M500
167-172 F6.4 10+22cm-2 nH Galactic HI column density
174-192 I19 --- objid Id in the SDSS-DR8 of the likely BCG (G3)
194-202 F9.5 deg RABdeg Likely BCG right ascension (J2000) (G3)
204-212 F9.5 deg DEBdeg Likely BCG declination (J2000) (G3)
214-219 F6.4 --- zp Cluster photometric redshift (G3)
221-226 F6.4 --- zs ?=0.0 Cluster spectroscopic redshift (G3)
228-229 I2 --- Nzs [0/19] Cluster galaxies with spectra (G3)
231-237 A7 --- ztype Redshift type (spec-z or photo-z)
239-244 F6.2 kpc offset Optical/X-ray offset
246-274 A29 --- NED Literature name (NED)
276-294 A19 --- Refs Reference of known clusters in refs.dat file
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Seq X-ray detection number in the 2XMMi-DR3 (G1)
8- 11 A4 --- --- [2XMM]
12 A1 --- n_2XMM [I] when 2XMMi release (Cat. IX/41)
14- 29 A16 --- 2XMM IAU name given in the 2XMMi-DR3 cat. (G1)
31- 39 F9.5 deg RAdeg X-ray detection right ascension (J2000) (G1)
41- 49 F9.5 deg DEdeg X-ray detection declination (J2000) (G1)
51- 60 A10 --- ObsID XMM-Newton observation number (G1)
62- 67 F6.4 --- z Cluster redshift (G2)
69- 72 F4.2 kpc/arcsec Scale Scale at the cluster redshift
74- 80 F7.2 kpc R500 Estimated radius R500
82- 87 F6.2 10-17W/m2 Fcat X-ray flux in [0.5-2.0]keV band
(in 10-14erg/cm2/s) (F1)
89- 92 F4.2 10-17W/m2 e_Fcat Error in Fcat
94- 99 F6.2 10+35W Lcat X-ray luminosity in [0.5-2]keV band
(in 1042erg/s)
101-105 F5.2 10+35W e_Lcat Error in Lcat
107-113 F7.2 10+35W L500 X-ray bolometric luminosity within R500
(in 1042erg/s)
115-120 F6.2 10+35W e_L500 Error in L500
122-126 F5.2 10+13Msun M500 Mass within R500
128-132 F5.2 10+13Msun e_M500 Error in M500
134-137 F4.2 keV T500 X-ray temperature within R500
139-142 F4.2 keV e_T500 Error in T500
144-162 I19 --- objid Id in the SDSS-DR8 of the likely BCG (G3)
164-172 F9.5 deg RABdeg Likely BCG right ascension (J2000) (G3)
174-182 F9.5 deg DEBdeg Likely BCG declination (J2000) (G3)
184-189 F6.4 --- zp Cluster photometric redshift (G3)
191-196 F6.4 --- zs ?=0.0 Cluster spectroscopic redshift (G3)
198-199 I2 --- Nzs [0/47] Cluster galaxies with spectra (G3)
201-207 A7 --- ztype Redshift type (spec-z or photo-z)
209-214 F6.2 kpc offset Optical/X-ray offset
216-244 A29 --- NED Literature name (NED)
246-259 A14 --- Refs Reference of known clusters in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 43 A20 --- Aut Author's name
46- 65 A20 --- Com Comments
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Global notes:
Note (G1): All these parameters are extracted from the 2XMMi-DR3 catalogue.
Note (G2): The cluster is redshift from zsp otherwise from zph, as
indicated in ztype.
Note (G3): These parameters are obtained from the developed optical cluster
detection algorithm.
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Acknowledgements:
Ali Takey, atakey (at)aip.de
References:
Takey et al., Paper I 2011A&A...534A.120T 2011A&A...534A.120T, Cat J/A+A/534/A120
(End) Patricia Vannier [CDS] 29-Aug-2013