The SRG/eROSITA All-Sky Survey The first catalog of galaxy clusters and groups in the Western Galactic Hemisphere

被引：70

作者：

Bulbul, E. ^{[1
]}

Liu, A. ^{[1
]}

Kluge, M. ^{[1
]}

Zhang, X. ^{[1
]}

Sanders, J. S. ^{[1
]}

Bahar, Y. E. ^{[1
]}

Ghirardini, V. ^{[1
]}

Artis, E. ^{[1
]}

Seppi, R. ^{[1
]}

Garrel, C. ^{[1
]}

Ramos-Ceja, M. E. ^{[1
]}

Comparat, J. ^{[1
]}

Balzer, F. ^{[1
]}

Boeckmann, K. ^{[2
]}

Brueggen, M. ^{[2
]}

Clerc, N. ^{[3
]}

Dennerl, K. ^{[1
]}

Dolag, K. ^{[4
]}

Freyberg, M. ^{[1
]}

Grandis, S. ^{[4
,5
]}

Gruen, D. ^{[4
]}

Kleinebreil, F. ^{[5
,8
]}

Krippendorf, S. ^{[4
,6
]}

Lamer, G. ^{[7
]}

Merloni, A. ^{[1
]}

Migkas, K. ^{[8
]}

Nandra, K. ^{[1
]}

Pacaud, F. ^{[8
]}

Predehl, P. ^{[1
]}

Reiprich, T. H. ^{[8
]}

Schrabback, T. ^{[5
,8
]}

Veronica, A. ^{[8
]}

Weller, J. ^{[1
,4
]}

Zelmer, S. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany

[2] Univ Hamburg, Hamburg Observ, Gojenbergsweg 112, D-21029 Hamburg, Germany

[3] Univ Toulouse, IRAP, CNRS, UPS,CNES, F-31028 Toulouse, France

[4] Ludwig Maximilians Univ Munchen, Univ Sternwarte, Scheinerstr 1, D-81679 Munich, Germany

[5] Univ Innsbruck, Inst Astro & Teilchenphys, Technikerstr 25-8, A-6020 Innsbruck, Austria

[6] Ludwig Maximilians Univ Munchen, Arnold Sommerfeld Ctr Theoret Phys, Theresienstr 37, D-80333 Munich, Germany

[7] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[8] Univ Bonn, Argelander Inst Astron AIfA, Hugel 71, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 685卷

基金：

欧洲研究理事会;

关键词：

catalogs; galaxies: clusters: general; galaxies: groups: general; large-scale structure of Universe; X-rays: galaxies; X-rays: galaxies: clusters; EQUATORIAL-DEPTH SURVEY; LENSING MASS CALIBRATION; FLUX-LIMITED SAMPLE; X-RAY-PROPERTIES; INTRACLUSTER MEDIUM; COSMOLOGICAL CONSTRAINTS; SCALE STRUCTURE; EMISSION-LINE; FOLLOW-UP; EVOLUTION;

D O I：

10.1051/0004-6361/202348264

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories of the growth of structure, and constrain cosmological models. The driving science goal of the SRG/eROSITA All-Sky Survey is to assemble a large sample of X-ray clusters with a well-defined selection function to determine the evolution of the mass function and, hence, the cosmological parameters. We present here a catalog of 12 247 optically confirmed galaxy groups and clusters detected in the 0.2-2.3 keV as extended X-ray sources in a 13 116 deg(2) region in the western Galactic half of the sky, which eROSITA surveyed in its first six months of operation. The clusters in the sample span the redshift range 0.003 < z < 1.32. The majority (68%) of these clusters, 8361 sources, represent new discoveries without known counterparts in the literature. The mass range of the sample covers three orders of magnitude from 5 x 10(12) M-sun to 2 x 10(15)M(sun). We construct a sample for cosmology with a higher purity level (similar to 95%) than the primary sample, comprising 5259 securely detected and confirmed clusters in the 12791 deg(2) common footprint of eRASS1 and the DESI Legacy Survey DR10. We characterize the X-ray properties of each cluster, including their flux, luminosity and temperature, the total mass, gas mass, gas mass fraction, and mass proxy Y-X. These are determined within two apertures, 300 kpc, and the overdensity radius R-500, and are calculated by applying a forward modeling approach with a rigorous X-ray background treatment, K-factor, and the Galactic absorption corrections. Population studies utilizing log N-log S, the number of clusters detected above a given flux limit, and the luminosity function show overall agreement with the previous X-ray surveys after accounting for the survey completeness and purity through the selection function. The first eROSITA All-Sky Survey provides an unprecedented sample of galaxy groups and clusters selected in the X-ray band. The eRASS1 cluster catalog demonstrates the excellent performance of eROSITA for extended source detection, consistent with the pre-launch expectations for the final all-sky survey, eRASS:8.

引用

页数：26

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