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The SRG/eROSITA All-Sky Survey
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-05-15 , DOI: 10.1051/0004-6361/202348264
E. Bulbul , A. Liu , M. Kluge , X. Zhang , J. S. Sanders , Y. E. Bahar , V. Ghirardini , E. Artis , R. Seppi , C. Garrel , M. E. Ramos-Ceja , J. Comparat , F. Balzer , K. Böckmann , M. Brüggen , N. Clerc , K. Dennerl , K. Dolag , M. Freyberg , S. Grandis , D. Gruen , F. Kleinebreil , S. Krippendorf , G. Lamer , A. Merloni , K. Migkas , K. Nandra , F. Pacaud , P. Predehl , T. H. Reiprich , T. Schrabback , A. Veronica , J. Weller , S. Zelmer

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 deg2 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 × 1012 Msun to 2 × 1015Msun. We construct a sample for cosmology with a higher purity level (~95%) than the primary sample, comprising 5259 securely detected and confirmed clusters in the 12791 deg2 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 YX. These are determined within two apertures, 300 kpc, and the overdensity radius R500, 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.

中文翻译:

SRG/eROSITA 全天巡天

星系团可以作为强大的探测器来研究大尺度的天体物理过程,测试结构增长理论,并约束宇宙学模型。 SRG/eROSITA 全天巡天的驱动科学目标是组装大量 X 射线星团样本,并具有明确定义的选择函数,以确定质量函数的演化,从而确定宇宙学参数。我们在此展示了一份目录,其中包含 12 247 个经光学确认的星系群和星系团,它们在 0.2–2.3 keV 范围内作为扩展 X 射线源在银河系西半边天空的 13 116 deg 2区域中检测到,这是 eROSITA 在前六次观测中进行的几个月的运营。样本中的簇跨越红移范围 0.003 < z < 1.32。这些簇中的大多数(68%)(8361 个来源)代表了文献中没有已知对应物的新发现。样品的质量范围涵盖了从5×10 12 M sun到2×10 15 M sun的三个数量级。我们构建了一个比原始样本纯度更高 (~95%) 的宇宙学样本,其中包含eRASS1 和 DESI Legacy Survey DR10 12791 deg 2共同足迹中的 5259 个安全检测到和确认的星团。我们描述了每个星团的 X 射线特性,包括它们的通量、光度和温度、总质量、气体质量、气体质量分数和质量代理Y X 。这些是在两个孔径、300 kpc 和超密度半径R 500内确定的,并通过应用具有严格 X 射线背景处理、K因子和银河吸收校正的正演建模方法来计算。在通过选择函数考虑调查完整性和纯度后,利用 log N -log S 、在给定通量限制之上检测到的簇数量以及光度函数进行的群体研究显示与之前的 X 射线调查总体一致。第一次 eROSITA 全天巡天提供了在 X 射线波段中选择的星系群和星团的前所未有的样本。 eRASS1星团目录展示了eROSITA在扩展源检测方面的卓越性能,与最终全天巡天eRASS:8的发射前期望一致。
更新日期:2024-05-15
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