Co-evolution of Galaxies and Central Black Holes: Observational Evidence on the Trigger of AGN Feedback
Co-evolution of Galaxies and Central Black Holes: Observational Evidence on the Trigger of AGN Feedback
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星系和中心黑洞的共同演化：活动星系核反馈触发的观测证据
DOI：
10.1088/0004-637x/750/1/54
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Y. Matsuoka
中科院分区：
文献类型：
--
作者：
Y. Matsuoka;F.-T. Yuan;Y. Takeuchi;K. Yanagisawa;Y. Matsuoka
对类星体周围的扩展发射线区（EELR）进行了全面的分析。一个新的斯巴鲁/Suprime-Cam观测与文献检索相结合，导致汇编81 EELR测量1型和2型类星体与相关的活动星系核（AGN）和宿主星系的属性。研究发现，EELR现象与爱丁顿比有明显的相关性，爱丁顿比将EELR与活动星系核辐射相关性的主成分1或特征向量1的成分联系起来。我们还发现，EELR是优先与富含气体，大质量的蓝色星系。这支持了EELR产生的主要决定因素是气体可用性的想法，气体可能是由星系合并带来的，触发了当前的星星形成以及AGN活动，也解释了大多数发光的EELR是在低爱丁顿比的射电大声源周围发现的。综合所有的观测结果，我们认为EELR类星体在星系颜色-恒星质量图上占据了绿色山谷的蓝色角落，即活动星系核区域。一旦一个星系被推到这个角落，激活的AGN将通过向星际气体注入能量而产生一个EELR，并最终将其吹走，导致星星形成淬火。本文的结果为活动星系核反馈过程的存在提供了证据，它可能在星系和中心超大质量黑洞的共同演化中起主导作用。
A comprehensive analysis of the extended emission-line region (EELR) around quasars is presented. A new Subaru/Suprime-Cam observation is combined with a literature search, resulting in a compilation of 81 EELR measurements for type-1 and type-2 quasars with an associated active galactic nucleus (AGN) and host galaxy properties. It is found that the EELR phenomenon shows clear correlation with the Eddington ratio, which links EELR to the constituents of principal component 1, or eigenvector 1, of the AGN emission correlations. We also find that EELR is preferentially associated with gas-rich, massive blue galaxies. This supports the idea that the primary determinant of EELR creation is gas availability and that the gas may be brought in by galaxy merger, triggering the current star formation as well as AGN activity, and also gives an explanation for the fact that most luminous EELRs are found around radio-loud sources with low Eddington ratio. By combining all the observations, it is suggested that EELR quasars occupy the massive blue corner of the green valley, the AGN realm, on the galaxy color–stellar mass diagram. Once a galaxy is pushed to this corner, an activated AGN would create an EELR by energy injection into the interstellar gas and eventually blow it away, leading to star formation quenching. The results presented here provide a piece of evidence for the presence of such an AGN feedback process, which may play a leading role in the co-evolution of galaxies and central super-massive black holes.