NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T04:17:05 PDT
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For refcode 2006PASJ...58..931H:
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NED Abstract

Copyright by Astronomical Society of Japan. 2006PASJ...58..931H Overdensity of X-Ray Sources in the Field of Two Nearby Clusters of Galaxies: XMM-Newton View of A 194 and A 1060 Hudaverdi, Murat; Kunieda, Hideyo; Tanaka, Takeshi; Haba, Yoshito; Furuzawa, Akihiro; Tawara, Yuzuru; Ercan, E. Nihal 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)-log(S) for a flux limit of F_X_ >= 1 x 10^-14^erg cm^-2^ s^-1^ was calculated and compared with that of the Lockman Hole. A ~ 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^ <= L_X_ <= 10^41.4^ erg 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_X_ >= 10^40.5^erg 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_X_/L_B_), the observed overdensity is ascribed to AGN fueling by its infall into cluster environment for L_X_ <= 10^40.5^ erg 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. Key words: galaxies: clusters: individual (Abell 194, Abell 1060)
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