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arXiv 2402.17822astro-ph.HEastro-ph.CO
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eROSITA星表中的星系团维里激波源

Galaxy cluster virial-shock sources in eROSITA catalogs

Gideon Ilani, Kuan-Chou Hou, Gil Nadler, Uri Keshet

AI总结:

本研究叠加分析eROSITA EDR星表,在532个星系团的r/R500≈2.0–2.25处统计发现与维里激波相关的明亮炽热展源,为宇宙网吸积提供新探针。

摘要:

在近期识别出与MCXC星系团和星系群的维里激波相关的离散ROSAT和射电源之后,我们考察eROSITA-DE早期数据发布(EDR)是否在其140平方度视场内呈现维里激波X射线源。我们围绕EDR星表中的星系团和星系群对EDR星表源进行叠加和径向分箱。通过比较维里激波区域与视场,以统计方式推断出超额维里激波源的性质。在已分辨的532个星系团中,发现X射线源的超额狭窄地局域于2.0<r/R500<2.25的归一化半径处,恰位于预期维里激波内侧;对于展源(534个源,3σ)或亮源(5820个源,3.5σ;排除低星系团质量四分位后为4σ)样本均是如此。这些超额源平均而言是展源(约100 kpc)、明亮(L_X≃10^43–44 erg s^-1)且炽热(约keV量级),与穿越维里激波的下落气体晕相符。结果与叠加的ROSAT-MCXC信号一致,显示出EDR红移处所预期的更高L_X以及可能的宿主质量依赖性。离散射电、X射线以及可能还有γ射线源分布中局域化的维里激波峰,是研究宇宙网吸积的新型强大探针;预计未来诸如eROSITA的全天星表将给出强有力的约束。

英文摘要:

Following the recent identification of discrete ROSAT and radio sources associated with the virial shocks of MCXC clusters and groups, we examine if the early eROSITA-DE data release (EDR) shows virial-shock X-ray sources within its $140$ deg$^2$ field. EDR catalog sources are stacked and radially binned around EDR catalog clusters and groups. The properties of the excess virial-shock sources are inferred statistically by comparing the virial-shock region to the field. An excess of X-ray sources is found narrowly localized at the $2.0<r/R_{500}<2.25$ normalized radii, just inside the anticipated virial shocks, of the resolved 532 clusters, for samples of both extended ($3σ$ for 534 sources) or bright ($3.5σ$ for 5820 sources; $4σ$ excluding the low cluster-mass quartile) sources. The excess sources are on average extended ($\sim 100$ kpc), luminous ($L_X\simeq 10^{43-44}$ erg s$^{-1}$), and hot ($\sim$keV), consistent with infalling gaseous halos crossing the virial shock. The results agree with the stacked ROSAT-MCXC signal, showing the higher $L_X$ anticipated at EDR redshifts and a possible dependence upon host mass. Localized virial-shock spikes in the distributions of discrete radio, X-ray, and probably also $γ$-ray sources are new powerful probes of accretion from the cosmic web, with strong constraints anticipated with future all-sky catalogs such as by eROSITA.

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