J/MNRAS/522/1601 Masses of galaxy clusters and groups in eFEDS (Chiu+, 2023)
Cosmological constraints from galaxy clusters and groups in the eROSITA
final equatorial depth survey.
Chiu I.-N., Klein M., Mohr J., Bocquet S.
<Mon. Not. R. Astron. Soc. 522, 1601-1642 (2023)>
=2023MNRAS.522.1601C 2023MNRAS.522.1601C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Active gal. nuclei
Keywords: gravitational lensing: weak - galaxies: clusters: general -
cosmological parameters; dark energy -
large-scale structure of Universe - X-rays: galaxies: clusters
Abstract:
We present the first cosmological study of a sample of eROSITA
clusters, which were identified in the eROSITA Final Equatorial Depth
Survey (eFEDS). In a joint selection on X-ray and optical observables,
the sample contains 455 clusters within a redshift range of 0.1 < z < 1.2,
of which 177 systems are covered by the public data from the Hyper
Suprime-Cam (HSC) survey that enables uniform weak-lensing cluster
mass constraints. With minimal assumptions, at each cluster redshift
we empirically model (1) the scaling relations between the cluster
halo mass and the observables, which include the X-ray count rate, the
optical richness, and the weak-lensing mass, and (2) the X-ray
selection in terms of the completeness function C. Using the richness
distribution of the clusters, we directly measure the X-ray
completeness and adopt those measurements as informative priors for
the parameters of C. In a blinded analysis, we obtain the cosmological
constraints ωm=0.245+0.048-0.058,
σ8=0.833+0.075-0.063, and
S8 = σ8(ωm/0.3)0.3 = 0.791+0.028-0.031 in a
flat LCDM cosmology. Extending to a flat wCDM cosmology leads to the
constraint on the equation of state parameter of the dark energy of
w = -1.25 ± 0.47. The eFEDS constraints are in good agreement with
the results from the Planck mission, the galaxy-galaxy lensing and
clustering analysis of the Dark Energy Survey, and the cluster
abundance analysis of the SPT-SZ survey at a level of ≲ 1σ.
With the empirical modelling, this work presents the first fully
self-consistent cosmological constraints based on a synergy between
wide-field X-ray and weak lensing surveys.
Description:
In this paper, we continue to constrain cosmology by combining the
weak-lensing mass calibration presented in Chiu et al.
(2022A&A...661A..11C 2022A&A...661A..11C, Cat. J/A+A/661/A11) with the abundance of the
eFEDS clusters. We stress that the eFEDS clusters used in this work
are first selected in X-rays and then confirmed in the optical,
resulting in a clean and sizable sample for cosmological study without
losing a significant amount of clusters due to a more stringent X-ray
selection. We use the sample of clusters in the eROSITA Final
Equatorial Depth Survey (eFEDS), of which the data and catalogues are
publicly available within the eROSITA Early Data Release. The data
were processed by the pipeline eSASSusers_201009, which is described
in detail in Brunner et al. (2022A&A...661A...1B 2022A&A...661A...1B, Cat. J/A+A/661/A1).
After the source detection, the catalogue of eFEDS clusters is
constructed using the criteria of Ldet > 5, Lext > 6, and EXT > 0,
resulting in the 542 clusters that are publicly released in Liu et al.
(2022A&A...661A...2L 2022A&A...661A...2L, Cat. J/A+A/661/A2).
Along the section 5, we first present the results obtained from
independently modelling the mass calibration and the cluster
abundance, and then the results of the joint analysis. Finally, the
cosmological constraints are presented. We focus on the modelling
assuming a flat LCDM cosmology and then extend the results to the flat
wCDM cosmology. Then, with the mass posterior P(M|η,z,p) for each
cluster we randomly sample a mass estimate from the posterior as the
'ensemble' mass. The ensemble mass here is referred to as the
individual mass estimate that acts as an ensemble statistic inferred
from the overall population modelling. The uncertainty of the cluster
mass, which is derived as the dispersion of the mass posterior, is at
a level of about 20 per cent for a cluster with
M500c ≃ 1014 h-1 M☉. We provide these mass measurements
in tableb1.dat of the same 542 sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 247 542 *The mass measurements of individual eFEDS
clusters
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Note on table.dat: The mass units are given in [Msun/h] with h=H0/100 km/s/Mpc,
with H0 value taken from Planck 2018 results. VI. Cosmological parameters of
Plank Collaboration et al. (2020A&A...641A...6P 2020A&A...641A...6P).
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See also:
J/MNRAS/488/739 : MARD-Y3 catalog (Klein+, 2019)
J/MNRAS/474/3324 : Multicomponent matched filter test (Klein+, 2018)
J/MNRAS/444/147 : Richness of galaxy clusters (Oguri, 2014)
J/A+A/661/A1 : The eFEDS X-ray catalogs (V7.4) (Brunner+, 2022)
J/A+A/661/A10 : eFEDS galaxy clusters and groups in disguise (Bulbul+, 2022)
J/A+A/661/A11 : eFEDS. Masses of galaxy clusters and groups (Chui+, 2022)
J/A+A/661/A2 : Galaxy clusters and groups in eFEDS (Liu+, 2022)
J/A+A/661/A3 : eFEDS counterparts to point-like sources (Salvato+, 2022)
J/A+A/661/A4 : eFEDS optical cluster and group catalog (Klein+, 2022)
J/A+A/661/A7 : X-ray properties of eFEDS clusters and groups (Bahar+, 2022)
J/A+A/652/A12 : The new X-Class catalogue (Koulouridis+, 2021)
J/A+A/638/A114 : CODEX galaxy clusters catalog (Finoguenov+, 2020)
J/A+A/594/A27 : Planck Sunyaev-Zeldovich sources (PSZ2) (Planck+, 2016)
J/A+A/588/A103 : Second ROSAT all-sky survey (2RXS) source catalog
(Boller+, 2016)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/ApJ/934/129 : Combination of Planck and SPT cluster catalogs
(Salvati+, 2022)
J/ApJ/890/148 : Concentration-mass relation for XXL clusters (Umetsu+, 2020)
J/ApJ/878/55 : SPT-SZ clusters with optical & X-ray data (Bocquet+, 2019)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/ApJS/253/3 : Sunyaev-Zel'dovich galaxy clusters surveyed by ACT
(Hilton+, 2021)
J/ApJS/247/25 : The SPTpol Extended Cluster Survey (Bleem+, 2020)
J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey
(Bleem+, 2015)
J/PASJ/73/817 : Weak lensing shear-selected cluster samples (Oguri+, 2021)
J/PASJ/70/S20 : HSC Wide S16A cluster catalog (Oguri+, 2018)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+,2016)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Name The cluster name (Name)
24- 43 F20.18 --- zbest The cluster redshift the quantity in the
official eFEDS catalog (ZBESTCOMB)
45- 63 F19.16 arcmin R500cL The cluster radius R500c in the LCDM
cosmology (r500c_lcdm)
65- 82 F18.15 [Msun] log(M500cEL) The ensemble mass M500c,ens in the LCDM
cosmology (ensemble500clcdm)
84-101 F18.15 [Msun] log(M500cML) The median of the mass posterior
P(M|η,z,p) where are the
best-fitting parameters in the LCDM
cosmology (median500clcdm)
103-123 E21.17 [Msun] E_log(M500cML) Upper uncertainty from distribution of
log (M500cML) (m500clcdmhierr)
125-145 E21.17 [Msun] e_log(M500cML) Lower uncertainty from distribution of
log (M500cML) (m500clcdmloerr)
147-165 F19.16 arcmin R500cw The cluster radius R500c in the wCDM
cosmology (r500c_wcdm)
167-184 F18.15 [Msun] log(M500cEw) The ensemble mass M500c,ens in the wCDM
cosmology (ensemble500cwcdm)
186-203 F18.15 [Msun] log(M500cMw) The median of the mass posterior
P(M|η,z,p) where are the
best-fitting parameters in the wCDM
cosmology (median500cwcdm)
205-225 E21.17 [Msun] E_log(M500cMw) Upper uncertainty from distribution of
log (M500cMw) (m500cwcdmhierr)
227-247 E21.17 [Msun] e_log(M500cMw) Lower uncertainty from distribution of
log (M500cMw) (m500cwcdmloerr)
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History:
From electronic version of the journal
License: CC-BY-4.0
(End) Luc Trabelsi [CDS] 24-Jun-2026