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Galaxy cluster virial-shock sources in eROSITA catalogs
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-17 , DOI: 10.1051/0004-6361/202449819 Gideon Ilani , Kuan-Chou Hou , Gil Nadler , Uri Keshet
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-17 , DOI: 10.1051/0004-6361/202449819 Gideon Ilani , Kuan-Chou Hou , Gil Nadler , Uri Keshet
Context. Virial shocks around galaxy clusters and groups are being mapped, thus tracing accretion onto large-scale structure.Aims. Following the recent identification of discrete ROSAT and radio sources associated with the virial shocks of MCXC clusters and groups, we examined the eROSITA-DE Early Data Release (EDR) to see whether it shows virial-shock X-ray sources within its 140 deg2 field.Methods. EDR catalog sources were stacked and radially binned around EDR catalog clusters and groups. The properties of the excess virial-shock sources were inferred statistically by comparing the virial-shock region to the field.Results. We find an excess of X-ray sources narrowly localized at the 2.0 < r/R500 < 2.25 normalized radii, just inside the anticipated virial shocks, of the resolved 532 clusters, for samples of both extended sources (3σ for 534 sources) and bright sources (3.5σ for 5820 sources; 4σ excluding the low cluster-mass quartile). The excess sources are on average extended (∼100 kpc), luminous (LX ≃ 1043 − 44 erg s−1), and hot (keV scales), consistent with infalling gaseous halos crossing the virial shock. The results agree with the stacked ROSAT–MCXC signal, showing the higher LX expected at EDR redshifts and a possible dependence on host mass.Conclusions. Localized virial-shock spikes in the distributions of discrete radio, X-ray, and possibly also γ-ray sources are new powerful probes of accretion from the cosmic web. We expect that data from future all-sky catalogs will allow us to place strong constraints on virial shock physics.
中文翻译：
eROSITA 目录中的星系团维里激波源
语境。正在绘制星系团和星系群周围的维里激波，从而追踪大规模结构的吸积。目标。在最近识别出与 MCXC 星团和群体的维里冲击相关的离散 ROSAT 和无线电源之后，我们检查了 eROSITA-DE 早期数据发布 (EDR)，看看它是否在 140 度范围内显示了维里冲击 X 射线源 < b0>
更新日期：2024-06-17
中文翻译：
eROSITA 目录中的星系团维里激波源
语境。正在绘制星系团和星系群周围的维里激波，从而追踪大规模结构的吸积。目标。在最近识别出与 MCXC 星团和群体的维里冲击相关的离散 ROSAT 和无线电源之后，我们检查了 eROSITA-DE 早期数据发布 (EDR)，看看它是否在 140 度范围内显示了维里冲击 X 射线源 < b0>
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