The Host Galaxies and Environment of Chandra-Selected Active Galactic Nuclei in the Deep ACS GTO Cluster Fields
The Host Galaxies and Environment of Chandra-Selected Active Galactic Nuclei in the Deep ACS GTO Cluster Fields
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深部 ACS GTO 星团场中钱德拉选择的活动星系核的宿主星系和环境
DOI：
10.1086/509256
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发表时间：
2007
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影响因子：
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通讯作者：
L. Infante
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作者：
A. Martel;F. Menanteau;P. Tozzi;H. Ford;L. Infante
我们展示了在 RX J0152-1357、RX J0849+4452、RDCS J0910+5422、MS 1054-0321 和 RDCS J1252-2927 五个星团领域中发现的钱德拉选择的 X 射线源的光学对应物的目录和图像，这些图像是使用高级巡天相机作为 ACS 保证时间的一部分进行成像的观察者计划。 ACS 马赛克内共有 98 个 X 射线源，其中约 96% 的 X 射线源得到了阳性识别，包括已确认的星团成员。我们根据 X 射线输出将源分类为活动星系核 (AGN) 或 QSO。 log N(> S)-log S 检验表明 RX J0152-1357、RDCS J0910+5422 和 MS 1054-0321 场中的 X 射线源相对于 CDF-S 显着过高，表明某些 X 射线源与星团的大规模结构存在关联。从不对称性和集中指数来看，约 52% 的光学对应物是早型星系，约 35% 是晚型星系，其余的不规则。大约一半的早期型星系中发现了蓝色核心。通过目视检查，大约 40% 的对应物具有未解析的核，这是核活动的常见特征。尽管选择效应可能很重要，但大多数这些核都是在近面晚型星系中发现的。原子核的 X 射线与光通量之比与晚期型星系的倾角相关，但与早期型星系的倾角无关，正如预期的那样，如果尘埃在核周区域很显着的话。与同一区域的星系总数相比，活动星系核拥有约 50% 的附近伴星。 X 射线源的表面密度在距星团中心 ≲1 Mpc 的投影半径处最高，而在较大半径处相对平坦。我们描述了簇成员的形态和环境，并将它们与其他光学对应物进行比较。
We present catalogs and images of optical counterparts to the Chandra-selected X-ray sources found in the fields of the five clusters RX J0152-1357, RX J0849+4452, RDCS J0910+5422, MS 1054-0321, and RDCS J1252-2927, which were imaged with the Advanced Camera for Surveys as part of the ACS Guaranteed Time Observer programs. A total of 98 X-ray sources fall within the ACS mosaics, and positive identifications are made for ~96% of them, including confirmed cluster members. We classify the sources as active galactic nuclei (AGNs) or QSOs depending on their X-ray output. The log N(> S)- log S test indicates a significant overdensity of X-ray sources in the RX J0152-1357, RDCS J0910+5422, and MS 1054-0321 fields with respect to the CDF-S, suggesting an association of some X-ray sources with the large-scale structure of the clusters. From the asymmetry and concentration indices, ~52% of the optical counterparts are early-type galaxies, ~35% late-type, and the remainder irregular. A blue core is found in approximately half of the early-type galaxies. From visual examination, approximately 40% of the counterparts possess an unresolved nucleus, a common signature of nuclear activity. A majority of these nuclei are found in near face-on late-type galaxies although selection effects might be important. The X-ray to optical flux ratio of the nuclei correlates with the inclination angle of the late-type galaxies but not of the early types, as expected if dust is significant in the circumnuclear regions. The AGNs possess a ~50% excess of nearby companions compared to the overall galaxy population in the same fields. The surface density of the X-ray sources is highest at projected radii of ≲1 Mpc from the cluster center and relatively flat at larger radii. We describe the morphology and environment of the cluster members and compare them with the other optical counterparts.
C.A.诺曼：《天体物理学杂志》。
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