LoCuSS: A DYNAMICAL ANALYSIS OF X-RAY ACTIVE GALACTIC NUCLEI IN LOCAL CLUSTERS
LoCuSS: A DYNAMICAL ANALYSIS OF X-RAY ACTIVE GALACTIC NUCLEI IN LOCAL CLUSTERS
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DOI：
10.1088/0004-637x/754/2/97
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发表时间：
2012-05
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影响因子：
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通讯作者：
C. Haines;C. Haines;M. Pereira;A. Sanderson;Graham P. Smith;E. Egami;A. Babul;A. Edge;A. Finoguenov;S. Moran;N. Okabe
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作者：
C. Haines;C. Haines;M. Pereira;A. Sanderson;Graham P. Smith;E. Egami;A. Babul;A. Edge;A. Finoguenov;S. Moran;N. Okabe
本文研究了在0.15 1042 erg s−1的26个大质量星系团的代表性样本中X射线活动星系核（AGN）的分布。在叠加焦散图中，显示了（vlos − vos）/σv与rproj/r500的关系，X射线活动星系核似乎更倾向于沿着焦散线分布，这暗示着粒子数的下降。它们似乎也避开了具有最低星团中心半径和相对速度（rproj 1042）的区域，并且IR亮（LTIR > 2 × 1010 L反馈）子样本在>2σ显著性下显示出比它们的X射线暗和IR暗对应物更高的速度色散。这与负责X射线和红外辐射的核活动是一致的，因为宿主星系被吸积到星系团中。总的来说，我们的研究结果提供了迄今为止最强有力的观测证据，表明在大质量星系团中发现的X射线活动星系核是一个不断下降的种群，并且星系团环境非常有效地抑制了其成员星系中的辐射有效核活动。这些结果与星系拥有X射线活动星系核的观点是一致的，它们应该是暗物质晕内的中心星系，并且有现成的冷气体供应。
We present a study of the distribution of X-ray active galactic nuclei (AGNs) in a representative sample of 26 massive clusters at 0.15 1042 erg s−1. In the stacked caustic diagram that shows (vlos − 〈v〉)/σv versus rproj/r500, the X-ray AGN appear to preferentially lie along the caustics, suggestive of an infalling population. They also appear to avoid the region with lowest cluster-centric radii and relative velocities (rproj 1042) and IR-bright (LTIR > 2 × 1010 L☉) subsamples show higher velocity dispersions than their X-ray dim and IR-dim counterparts at >2σ significance. This is consistent with the nuclear activity responsible for the X-ray and IR emission being slowly shut down as the host galaxies are accreted into the cluster. Overall, our results provide the strongest observational evidence to date that X-ray AGNs found in massive clusters are an infalling population, and that the cluster environment very effectively suppresses radiatively efficient nuclear activity in its member galaxies. These results are consistent with the view that for galaxies to host an X-ray AGN they should be the central galaxy within their dark matter halo and have a ready supply of cold gas.