Excess cataloged X-ray and radio sources at galaxy-cluster virial shocks
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arXiv
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2024
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| author | Ilani, Gideon Hou, Kuan-Chou Keshet, Uri |
| author_facet | Ilani, Gideon Hou, Kuan-Chou Keshet, Uri |
| contents | We detect a highly significant excess of X-ray (2RXS) and radio (NVSS, GMRT, VLSSr) catalog sources when stacked around MCXC galaxy clusters and groups, narrowly confined within $\lesssim100\mathrm{\,kpc}$ of the $\sim2.4 R_{500}$ virial shock radius (inferred from previous continuum stacking), with similar X-ray ($\sim4σ$ for $443$ clusters) and radio ($\sim4σ$ for $485$ clusters) characteristics ($>5σ$ joint). The excess sources show $10-100$ kpc scales, $L_X(0.1-2.4\mbox{ keV})\simeq10^{42-43}\mathrm{\,erg\,s^{-1}}$ or $νL_ν(ν=1.4\mbox{ GHz}) \simeq 10^{40-41}\mathrm{\,erg\,s^{-1}}$ luminosities, and a preferentially radial radio-polarization. The narrow localization and properties of the excess identify these sources not as AGN, often invoked speculatively for excess X-ray sources at cluster outskirts, but rather as infalling gaseous clumps interacting with the virial shock, probably galactic halos and possibly outflow remnants. The local excess of such discrete, radio-to-$γ$-ray sources around an object can probe its virial shock also at high redshifts and sub-cluster scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16946 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Excess cataloged X-ray and radio sources at galaxy-cluster virial shocks Ilani, Gideon Hou, Kuan-Chou Keshet, Uri High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics We detect a highly significant excess of X-ray (2RXS) and radio (NVSS, GMRT, VLSSr) catalog sources when stacked around MCXC galaxy clusters and groups, narrowly confined within $\lesssim100\mathrm{\,kpc}$ of the $\sim2.4 R_{500}$ virial shock radius (inferred from previous continuum stacking), with similar X-ray ($\sim4σ$ for $443$ clusters) and radio ($\sim4σ$ for $485$ clusters) characteristics ($>5σ$ joint). The excess sources show $10-100$ kpc scales, $L_X(0.1-2.4\mbox{ keV})\simeq10^{42-43}\mathrm{\,erg\,s^{-1}}$ or $νL_ν(ν=1.4\mbox{ GHz}) \simeq 10^{40-41}\mathrm{\,erg\,s^{-1}}$ luminosities, and a preferentially radial radio-polarization. The narrow localization and properties of the excess identify these sources not as AGN, often invoked speculatively for excess X-ray sources at cluster outskirts, but rather as infalling gaseous clumps interacting with the virial shock, probably galactic halos and possibly outflow remnants. The local excess of such discrete, radio-to-$γ$-ray sources around an object can probe its virial shock also at high redshifts and sub-cluster scales. |
| title | Excess cataloged X-ray and radio sources at galaxy-cluster virial shocks |
| topic | High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.16946 |