J/MNRAS/494/161 The X-CLASS-redMaPPer galaxy cluster sample (Molham+, 2020)
X-ray properties of the X-CLASS-redMaPPer galaxy cluster sample:
the luminosity-temperature relation.
Molham M., Clerc N., Takey A., Sadibekova T., Morcos A.B., Yousef S.,
Hayman Z.M., Lieu M., Raychaudhury S., Gaynullina E.R.
<Mon. Not. R. Astron. Soc., 494, 161-177 (2020)>
=2020MNRAS.494..161M 2020MNRAS.494..161M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, spectra ; X-ray sources ;
Redshifts ; Optical
Keywords: galaxies: clusters: general -
galaxies: clusters: intracluster medium - X-rays: galaxies: clusters
Abstract:
This article presents the results of a spectroscopic analysis of the
X-CLASS-redMaPPer (XC1-RM) galaxy cluster sample. X-CLASS is a
serendipitous search for clusters in X-ray wavebands based on the
XMM-Newton archive, whereas redMaPPer is an optical cluster catalogue
derived from the Sloan Digital Sky Survey (SDSS). The present sample
comprises 92 X-ray extended sources identified in optical images
within 1arcmin separation. The area covered by the cluster sample is
∼27deg2. The clusters span a wide redshift range (0.05<z<0.6) and 88
clusters benefit from spectroscopically confirmed redshifts using data
from SDSS Data Release 14. We present an automated pipeline to derive
the X-ray properties of the clusters in three distinct apertures:
R500 (at fixed mass overdensity), Rfit (at fixed signal-to-noise
ratio) and R300kpc (fixed physical radius). The sample extends over
wide temperature and luminosity ranges: from 1-10keV and from 6x1042
to 11x1044erg/s, respectively. We investigate the
luminosity-temperature (L-T) relation of the XC1-RM sample and find a
slope equal to 3.03±0.26. It is steeper than predicted by
self-similar assumptions, in agreement with independent studies. A
simplified approach is developed to estimate the amount and impact of
selection biases that might be affecting our recovered L-T parameters.
The result of this simulation process suggests that the measured L-T
relation is biased to a steeper slope and higher normalization.
Description:
The X-CLASS-redMaPPer (XC1-RM) cluster sample (Sadibekova et al.
2014A&A...571A..87S 2014A&A...571A..87S) is a joint sample between X-CLASS and redMaPPer
catalogues in the X-ray and optical bands, respectively, using the
best overlap between two survey footprints, which covers an area of
27deg2. The X-CLASS catalogue (Clerc et al. 2012MNRAS.423.3561C 2012MNRAS.423.3561C,
Cat. J/MNRAS/423/3561) embraces 845 class 1 X-ray-selected galaxy
clusters detected in 2774 XMM archival observations by 2010 May. The
redMaPPer catalogue in the optical waveband is based on the
red-sequence cluster finder algorithm, which was applied to SDSS DR8
(Rykoff et al. 2014ApJ...785..104R 2014ApJ...785..104R, Cat. J/ApJ/785/104). For this
study, we use the best joint X-optical sample of 92 clusters with
positional matching within an aperture of 1arcmin. Accurate individual
X-ray measurements have been provided for each cluster to ensure the
best source position and an optimal masking of other field detections.
Then, for the best flux estimate, a circular aperture around the X-ray
source position was tuned in a semi-automatic manner from the net
count rate (Clerc et al. 2012MNRAS.423.3561C 2012MNRAS.423.3561C, Cat. J/MNRAS/423/3561).
The cluster redshift zλ is photometric and provided from the
redMaPPer catalogue. We ran a query to search SDSS-DR14 for
spectroscopic redshifts (zs) for our list of clusters. We searched
for galaxies that have zs around each cluster X-ray position in a
circle of radius 17arcmin, which equals a physical radius of 1Mpc at
redshift 0.05.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 32 92 The X-CLASS-redMaPPer 92 cluster sample
tablea2.dat 70 57 Characteristic X-ray properties of 57 galaxy
clusters measured within R500
tablea3.dat 63 70 Characteristic X-ray properties of 70 galaxy
clusters measured within Rfit
tablea4.dat 66 92 Characteristic X-ray properties of 92 galaxy
clusters measured within R300kpc
tablea5.dat 73 22 Temperature measurements for 22 XC1 in the
literature
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See also:
J/MNRAS/423/3561 : X-ray clusters from XMM (Clerc+, 2012)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Cluster X-CLASS identifier
6- 12 F7.3 deg RAdeg Right ascension (J2000)
14- 19 F6.3 deg DEdeg Declination (J2000)
21- 24 F4.2 --- zphot Photometric redshift from the redMaPPer
catalogue (zλ)
26- 29 F4.2 --- zspec ? Spectroscopic redshift (zs)
31- 32 I2 --- Nmem ? Number of cluster members with spectroscopic
redshifts
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Cluster X-CLASS identifier
6- 10 F5.2 keV T X-ray temperature
12- 15 F4.2 keV e_T Lower error on T
17- 20 F4.2 keV E_T Upper error on T
22- 25 F4.2 Mpc R500 Radius at which the average density of the
cluster is 500 times the critical density of
the Universe
27- 30 F4.2 Mpc e_R500 Lower error on R500
32- 35 F4.2 Mpc E_R500 Upper error on R500
37- 42 F6.2 10-17W/m2 FX X-ray flux on the [0.5-2keV] band
44- 47 F4.2 10-17W/m2 e_FX Lower error on FX
49- 52 F4.2 10-17W/m2 E_FX Upper error on FX
54- 58 F5.2 [10-7W] logLX Logarithm of the X-ray luminosity in the
[0.5-2keV] band
60- 64 F5.3 [10-7W] e_logLX Lower error on logLX
66- 70 F5.3 [10-7W] E_logLX Upper error on logLX
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Cluster X-CLASS identifier
6- 10 F5.1 arcsec Rfit Radii corresponding to the cluster emission
extent (1)
12- 16 F5.2 keV T X-ray temperature
18- 22 F5.2 keV e_T Lower error on T
24- 29 F6.2 keV E_T [] Upper error on T
31- 35 F5.2 10-17W/m2 FX X-ray flux on the [0.5-2keV] band
37- 40 F4.2 10-17W/m2 e_FX Lower error on FX
42- 45 F4.2 10-17W/m2 E_FX Upper error on FX
47- 51 F5.2 [10-7W] logLX Logarithm of the X-ray luminosity in the
[0.5-2keV] band
53- 57 F5.3 [10-7W] e_logLX Lower error on logLX
59- 63 F5.3 [10-7W] E_logLX Upper error on logLX
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Note (1): A count-rate growth curve as a function of cluster radius was computed
from the total count rate (Figure 2) and Rfit (the cluster radius)
was chosen at the point where the cluster emission merges in the
background (the background is where S/N equals 1)
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Byte-by-byte Description of file: tablea4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Cluster X-CLASS identifier
6- 11 F6.2 arcsec R300 Aperture corresponding to a fixed physical
radius of 300kpc
13- 17 F5.2 keV T X-ray temperature
19- 23 F5.2 keV e_T Lower error on T
25- 30 F6.2 keV E_T [] Upper error on T
32- 38 F7.2 10-17W/m2 FX X-ray flux on the [0.5-2keV] band
40- 43 F4.2 10-17W/m2 e_FX Lower error on FX
45- 48 F4.2 10-17W/m2 E_FX Upper error on FX
50- 54 F5.2 [10-7W] logLX Logarithm of the X-ray luminosity in the
[0.5-2keV] band
56- 60 F5.3 [10-7W] e_logLX Lower error on logLX
62- 66 F5.3 [10-7W] E_logLX Upper error on logLX
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Cluster X-CLASS identifier
6- 9 F4.2 keV Tpub ? X-ray temperature from literature
11- 14 F4.2 keV e_Tpub ? Lower error on Tpub
16- 19 F4.2 keV E_Tpub ? Upper error on Tpub
21- 36 A16 --- Status Status
38- 40 A3 --- r_Tpub Reference for Tpub (1)
42- 46 A5 keV T500 ? X-ray temperature within R500
48- 51 F4.2 keV e_T500 ? Lower error on T500
53- 56 F4.2 keV E_T500 ? Upper error on T500
58- 63 F6.2 arcsec R500 ? Radius at which the average density of the
cluster is 500 times the critical density of
the Universe
65- 68 F4.2 arcsec e_R500 ? Lower error on R500
70- 73 F4.2 arcsec E_R500 ? Upper error on R500
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Note (1): Reference as follows:
0 = No published data
1 = Andersson et al. (2009ApJ...696.1029A 2009ApJ...696.1029A)
2 = Pratt & Arnaud (2003A&A...408....1P 2003A&A...408....1P)
3 = Pratt & Arnaud (2005A&A...429..791P 2005A&A...429..791P)
4 = Croston et al. (2008A&A...487..431C 2008A&A...487..431C)
5 = Kotov & Vikhlinin (2005ApJ...633..781K 2005ApJ...633..781K)
6 = Maughan et al. (2008ApJS..174..117M 2008ApJS..174..117M, Cat. J/ApJS/174/117)
7 = Planck Collaboration et al. (2011A&A...536A..11P 2011A&A...536A..11P)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 15-May-2023