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• W2013007274 startingPage "931" @default.
• W2013007274 abstract "Two nearby clusters of galaxies, A194 (⁠|$z = 0.018$|⁠) and A1060 (⁠|$z = 0.0114$|⁠), have been analyzed for their X-ray point-source properties with XMM-Newton EPIC-PN data. A multi-band source detection technique was applied to both of the clusters, resulting in 46 sources from the A194 field and 32 sources from the A1060 field, respectively. The cumulative |$log (N) hbox{--} log(S)$| for a flux limit of |$F_{mathrm{X}} geq 1 times 10^{-14} ,mathrm{erg} ,mathrm{cm}^{-2} ,mathrm{s}^{-1}$| was calculated and compared with that of the Lockman Hole. A |$sim 3,sigma$| excess of X-ray sources was found for the cluster regions. Considering the higher fraction observed in optical studies from the clusters, we estimate that the cluster source density is 6-times higher than the blank-field source density, and 15-times higher than the local group. Our X-ray selected sources have luminosity values of |$10^{39.6} leq L_{mathrm{X}} leq 10^{41.4} ,mathrm{erg} ,mathrm{s}^{-1}$|⁠, in which X-ray emission from LMXBs, hot halos and starburst galaxies becomes noticeable. The significance of the source-density excess gradually vanishes for sources with |$L_{mathrm{X}} geq 10^{40.5} ,mathrm{erg} ,mathrm{s}^{-1}$|⁠, at which point the source density becomes comparable to that of the blank-field level. Considering this confined low-luminosity range and the X-ray to optical luminosity ratios (⁠|$L_{mathrm{X}} / L_{mathrm{B}}$|⁠), the observed overdensity is ascribed to AGN fueling by its infall into cluster environment for |$L_{mathrm{X}} leq 10^{40.5} ,mathrm{erg} ,mathrm{s}^{-1}$| in the X-ray luminosity function. However, the quenching of AGN activity by the deep cluster potential explains why the excess of the source density vanishes for brighter sources." @default.
• W2013007274 created "2016-06-24" @default.
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• W2013007274 date "2006-12-25" @default.
• W2013007274 modified "2023-10-17" @default.
• W2013007274 title "Overdensity of X-Ray Sources in the Field of Two Nearby Clusters of Galaxies: XMM-Newton View of A 194 and A 1060" @default.
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• W2013007274 doi "https://doi.org/10.1093/pasj/58.6.931" @default.
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