The eROSITA Final Equatorial-Depth Survey (eFEDS): X-ray Properties and Scaling Relations of Galaxy Clusters and Groups
The eROSITA Final Equatorial-Depth Survey (eFEDS): X-ray Properties and Scaling Relations of Galaxy Clusters and Groups
复制标题
eROSITA 最终赤道深度巡天 (eFEDS)：星系团和星系群的 X 射线特性和标度关系
DOI：
10.1051/0004-6361/202142462
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发表时间：
2022
影响因子：
6.5
通讯作者：
Reiprich Thomas H.
中科院分区：
文献类型：
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作者：
Bahar Y. Emre;Bulbul Esra;Clerc Nicolas;Ghirardini Vittorio;Liu Ang;Nandra Kirpal;Pacaud Florian;Chiu I-Non;Comparat Johan;Ider-Chitham Jacob;Klein Mathias;Liu Teng;Merloni Andrea;Migkas Konstantinos;Okabe Nobuhiro;Ramos-Ceja Miriam E.;Reiprich Thomas H.
上下文尺度关系将宇宙尺度上星团的物理特性联系起来。它们用于探测大尺度结构的演化，估计星团的可观测量，并通过星团计数来约束宇宙学参数。目的我们利用Spectrum-Roentgen-Gamma/eROSITA观测研究在eFEDS场中检测到的星团的X射线可观测量之间的标度关系，同时考虑选择效应和可观测量随宇宙时间的分布。方法我们提取X射线可观测量(LX,Lbol,T,Mgas,YX) 在 R500 以内，用于 eFEDS 字段中 542 个簇的样本。通过应用检测和范围似然切割，我们构建了 265 个簇的子样本，其污染水平 <10%（包括 AGN 和虚假波动），用于我们的标度关系分析。我们的工作充分考虑了基于 eROSITA 天空最先进模拟的选择函数。结果我们提供了在 eFEDS 场中检测到的 542 个星系团和星系团的包含核心的 <R500 和核心切除的 0.15R500-R500 孔径中的 X 射线观测值。此外，我们还提出了 LX-T、LX-Mgas、LX-YX、Lbol-T、Lbol-Mgas、Lbol-YX 和 Mgas-T 之间 X 射线标度关系的归一化、斜率、红移演化和固有散射参数的最佳拟合结果。我们发现，最佳拟合斜率在 > 4σ 置信水平下显着偏离自相似模型，但我们的结果与包括非引力物理在内的模拟以及考虑选择效应的最新结果非常一致。结论我们发现与自相似场景的强烈偏差表明非引力效应在塑造观测到的星团物理状态方面发挥着重要作用。这项工作使用 eFEDS 观测将标度关系扩展到低质量、低光度星系团和星系团区域，证明了 eROSITA 能够通过测量深度曝光测量从星系团内介质到 R500 的发射，并将标度关系限制在较宽的质量-光度-红移范围内。
ContextScaling relations link the physical properties of clusters at cosmic scales. They are used to probe the evolution of large-scale structure, estimate observables of clusters, and constrain cosmological parameters through cluster counts.AimsWe investigate the scaling relations between X-ray observables of the clusters detected in the eFEDS field using Spectrum-Roentgen-Gamma/eROSITA observations taking into account the selection effects and the distributions of observables with cosmic time.MethodsWe extract X-ray observables (LX,Lbol,T,Mgas,YX) withinR500for the sample of 542 clusters in the eFEDS field. By applying detection and extent likelihood cuts, we construct a subsample of 265 clusters with a contamination level of <10% (including AGNs and spurious fluctuations) to be used in our scaling relations analysis. The selection function based on the state-of-the-art simulations of the eROSITA sky is fully accounted for in our work.ResultsWe provide the X-ray observables in the core-included <R500and core-excised 0.15R500-R500apertures for 542 galaxy clusters and groups detected in the eFEDS field. Additionally, we present our best-fit results for the normalization, slope, redshift evolution, and intrinsic scatter parameters of the X-ray scaling relations betweenLX-T,LX-Mgas,LX-YX,Lbol-T,Lbol-Mgas,Lbol-YX, andMgas-T. We find that the best-fit slopes significantly deviate from the self-similar model at a >4σ confidence level, but our results are nevertheless in good agreement with the simulations including non-gravitational physics, and the recent results that take into account selection effects.ConclusionsThe strong deviations we find from the self-similar scenario indicate that the non-gravitational effects play an important role in shaping the observed physical state of clusters. This work extends the scaling relations to the low-mass, low-luminosity galaxy cluster and group regime using eFEDS observations, demonstrating the ability of eROSITA to measure emission from the intracluster medium out toR500with survey-depth exposures and constrain the scaling relations in a wide mass-luminosity-redshift range.