J/A+A/690/A212 AXES-2MRS extended X-ray galaxy groups catalog (Khalil+, 2024)
AXES-2MRS: A new all-sky catalogue of extended X-ray galaxy groups.
Khalil H., Finoguenov A., Tempel E., Mamon G.A.
<Astron. Astrophys. 690, A212 (2024)>
=2024A&A...690A.212K 2024A&A...690A.212K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources
Keywords: galaxies: clusters: general -
galaxies: clusters: intracluster medium -
galaxies: groups: general - large-scale structure of Universe
Abstract:
Understanding baryonic physics at the galaxy-group level is a
prerequisite for cosmological studies of the large-scale structure.
One poorly understood aspect of galaxy groups is related to the
properties of their hot intragroup medium. The well-studied X-ray
groups have strong cool cores by which they were selected, so
expanding the selection of groups is currently an important avenue in
uncovering the diversity within the galaxy group population. We
present a new all-sky catalogue of X-ray-detected groups (AXES-2MRS)
based on the identification of large X-ray sources found in the ROSAT
All-Sky Survey (RASS) with the Two Micron Redshift Survey (2MRS)
Bayesian Group Catalogue. We studied the basic properties of these
galaxy groups to gain insights into the effect of different group
selections on the properties. In addition to X-ray luminosity from
shallow survey data of RASS, we obtained detailed X-ray properties of
the groups by matching the AXES-2MRS catalogue to archival X-ray
observations by XMM-Newton and complemented this by adding the
published XMM-Newton results on galaxy clusters in our catalogue. We
analysed temperature and density to the lowest overdensity accessible
by the data, obtaining hydrostatic mass estimates at a uniform
overdensity of 10000 times the critical, and comparing them to the
velocity dispersions of the groups. We explored the relationship
between X-ray and optical properties of AXES-2MRS groups through the
sigmav-LX, sigma_v-kT, kT-LX, σv-M, and c200-LX
scaling relations. We find a large spread in the central mass
M10000, measured by XMM-Newton, to virial mass M200, inferred by
the velocity dispersion, ratios for galaxy groups. This can either
indicate that large non-thermal pressure of galaxy groups affects our
X-ray mass measurements or the effect of a diversity of halo
concentrations on the X-ray properties of galaxy groups. Previous
catalogues based on detecting the peak of the X-ray emission
preferentially sample the high-concentration groups. In contrast, our
new catalogue uncovered many low-concentration groups, completely
revising our understanding of X-ray groups.
Description:
We present a new catalogue of AXES- MRS X-ray galaxy groups that has a
selection based on the baryonic content at M500.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
axes2mrs.dat 147 558 AXES-2MRS catalogue (table C1)
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See also:
J/A+A/618/A81 : Bayesian group finder applied to the 2MRS data (Tempel+, 2018)
Byte-by-byte Description of file: axes2mrs.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- AXES Extended X-ray source ID in the AXES
catalogue (GROUP_ID)
10- 13 I4 --- Group 2MRS group identification number from
Tempel et al. (2018A&A...618A..81T 2018A&A...618A..81T,
Cat. J/A+A/618/A81) (AXES_ID)
15- 23 F9.5 deg RAdeg X-ray detection right ascension (J2000) (RA)
25- 33 F9.5 deg DEdeg X-ray detection declination (J2000) (DEC)
35- 37 I3 --- Nmemb Number of spectroscopic members in
2MRS group catalogue (NMEM)
40- 42 I3 --- NmembClean ?=-99 Number of spectroscopic members after
the cleaning (NMEM_CLEAN)
44- 49 F6.4 --- zsp 2MRS group redshift (ZSPEC)
51- 60 F10.6 --- zspClean Group redshift, assigned using median value
of clean members (ZSPEC_CLEAN)
62- 72 F11.6 km/s CluvDispGap Gapper estimate of the cluster velocity
dispersion (CLUVDISP_GAP)
74- 75 A2 --- Gaussianity [G NA NG ] Gaussianity, based on the
substructure analysis (GAUSSIANITY) (1)
77- 88 E12.6 10-7W LX(0.1-2.4) Luminosity in the (0.1-2.4)keV band of the
cluster, aperture R500c (LX0124)
90-101 E12.6 10-7W e_LX(0.1-2.4) Uncertainty on LX(0.1-2.4) (ELX)
103-114 E12.6 mW/m2 F(0.5-2.0) Galaxy cluster X-ray flux in the
0.5-2.0keV band (FLUX520)
116-127 E12.6 mW/m2 e_F(0.5-2.0) Uncertainty on F(0.5-2.0) (EFLUX052)
129-136 F8.5 arcmin RE Apparent radial extent of X-ray emission
(R_E)
138-147 F10.6 arcmin R500 R500 radius (R_500)
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Note (1): Gaussianity flag as follows:
G = Gaussian
NG = non-Gaussian
NA = not analyzed
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Acknowledgements:
Alexis Finoguenov, alexis.finoguenov(at)helsinki.fi
(End) Patricia Vannier [CDS] 16-Sep-2024