Issue |
A&A
Volume 689, September 2024
|
|
---|---|---|
Article Number | A298 | |
Number of page(s) | 41 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202348852 | |
Published online | 23 September 2024 |
The SRG/eROSITA all-sky survey
Cosmology constraints from cluster abundances in the western Galactic hemisphere
1
Max Planck Institute for Extraterrestrial Physics,
Giessenbachstrasse 1,
85748
Garching,
Germany
2
IRAP, Université de Toulouse, CNRS, UPS, CNES,
31028
Toulouse,
France
3
Universität Innsbruck, Institut für Astro- und Teilchenphysik,
Technikerstr. 25/8,
6020
Innsbruck,
Austria
4
Department of Physics, National Cheng Kung University,
70101
Tainan,
Taiwan
5
Universitäts-Sternwarte, Faculty of Physics, LMU Munich,
Scheinerstr. 1,
81679
München,
Germany
6
Arnold Sommerfeld Center for Theoretical Physics, LMU Munich,
Theresienstr. 37,
80333
München,
Germany
7
Department of Physical Science, Hiroshima University,
1-3-1 Kagamiyama,
Higashi-Hiroshima, Hiroshima
739-8526,
Japan
8
Argelander-Institut für Astronomie (AIfA), Universität Bonn,
Auf dem Hügel 71,
53121
Bonn,
Germany
9
Leibniz-Institut für Astrophysik Potsdam (AIP),
An der Sternwarte 16,
14482
Potsdam,
Germany
10
Hamburger Sternwarte,
Gojenbergsweg 112,
21029
Hamburg,
Germany
11
McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University,
Pittsburgh,
PA
15213,
USA
12
Subaru Telescope, National Astronomical Observatory of Japan,
650 N Aohoku Place Hilo
HI
96720
USA
13
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University,
Nagoya
464-8602,
Japan
14
Institute for Advanced Research, Nagoya University,
Nagoya
464-8601,
Japan
15
Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo,
Chiba
277-8583,
Japan
Received:
5
December
2023
Accepted:
17
June
2024
The evolution of the cluster mass function traces the growth of linear density perturbations, providing valuable insights into the growth of structures, the nature of dark matter, and the cosmological parameters governing the Universe. The primary science goal of eROSITA, on board the Spectrum Roentgen Gamma (SRG) mission, is to constrain cosmology through the evolution of the cluster mass function. In this paper, we present a set of cosmological constraints obtained from 5259 clusters of galaxies detected over an area of 12791 deg2 in the western Galactic hemisphere of eROSITA’s first All-Sky Survey (eRASS1). The common footprint region (4968 deg2) between the eROSITA Survey and Dark Energy Survey (DES), the Kilo-Degree Survey (KiDS), and the Hyper Supreme Camera (HSC) survey is used for calibration of the scaling between X-ray count rate of the clusters and their total mass through measurements of their weak gravitational lensing signal. The eRASS1 cluster abundances constrain the ΛCDM parameters, namely, the energy density of the total matter to Ωm = 0.29−0.02+0.01 and the normalization of the density fluctuations to σ8 = 0.88 ± 0.02, and their combination yields S8 = σ8(Ωm/0.3)0.5 = 0.86 ± 0.01. These results are consistent and achieve at a similar precision with state-of-the-art cosmic microwave background (CMB) measurements. Furthermore, the eRASS1 cosmological experiment places a most stringent upper limit on the summed masses of left-handed light neutrinos to ∑ mv < 0.43 eV (95% confidence interval) from cluster number counts alone. By combining eRASS1 cluster abundance measurements with CMB- and ground-based neutrino oscillation experiments, we measured the summed neutrino masses to be ∑ mv = 0.09−0.02+0.04 eV or ∑ mv = 0.12−0.02+0.03 eV, assuming a normal or inverted mass hierarchy scenario for neutrino eigenstates. The eRASS1 cluster abundances significantly improve the constraints on the dark energy equation of state parameter to w = −1.12 ± 0.12. When ∑ mv and w are left free, we find consistent results with the concordance ΛCDM cosmology. Our results from the first All-Sky Survey improve the cosmological constraints by over a factor of 5 to 9 over the previous cluster surveys, establishing cluster abundance measurements for precision cosmology and setting the stage for deeper eROSITA All-Sky Surveys, as well as for future cluster abundance experiments.
Key words: surveys / galaxies: clusters: general / galaxies: clusters: intracluster medium / cosmology: observations / X-rays: galaxies: clusters
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model.
Open Access funding provided by Max Planck Society.
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