高z下黑洞生长与恒星组装
Black hole growth and stellar assembly at high-z
摘要：
上下文观测表明，恒星形成和黑洞（BH）增长之间存在着密切的联系，但有些问题仍然没有答案：这两种活动是否是同时代的，或者一种活动是否先于另一种活动，它们的特征时间尺度是什么，以及什么样的物理过程是这种相互作用的原因。目标。我们研究了z~2活动系统中活动星系核或恒星形成活动高峰期的恒星质量和BH质量（M_star和M_BH），以探讨它们之间的联系，以及活动星系核辐射或射电功率是否提供了一种反馈机制来调节这些系统中的恒星生长。方法.本文分析了射电、亚毫米波和中红外选定活动星系核在z~1-3处的红外光谱能量分布，并用活动星系核和宿主星系模板约束了它们的恒星和活动星系核光度。结果我们发现的证据，增加恒星光，从而减少AGN中红外功率从中红外选定AGN，射电星系，亚毫米AGN。这种趋势可以通过减小爱丁顿比或增加偏离局部M_BH-M_star关系来解释。所有系统的特点是高的恒星形成率，无论其不同的活动星系核功率，因此无论是活动星系核辐射功率或活动星系核驱动的无线电活动似乎影响恒星形成率在选定的活动星系核。我们讨论了两种可能的演化方案，可能会连接这三类活动星系核。
英文摘要：
Context. Observations indicate a strong link between star formation and black hole (BH) growth, but some questions remain unanswered: whether both activities are coeval or whether one precedes the other, what their characteristic timescales are, and what kinds of physical processes are responsible for this interplay. Aims. We examine stellar and BH masses (M_star and M_BH) in z~2 active systems at the peak of their AGN or star formation activity to investigate how they are linked and whether AGN radiative or else radio power provides a feedback mechanism that regulates the stellar growth in these systems. Methods. We analyze the infrared (IR) spectral energy distributions of radio, sub-millimeter and mid-IR selected AGNs at z~1-3 and constrain their stellar and AGN luminosities using AGN and host-galaxy templates. Results. We find evidence of increasing stellar light, thereby decreasing the AGN mid-IR power going from mid-IR selected AGNs, to radio galaxies, and to sub-millimeter AGNs. This trend can be explained by either decreasing Eddington ratios or increasing offsets from the local M_BH-M_star relation. All systems are characterized by high star formation rates regardless of their different AGN powers, thus neither AGN radiative power nor AGN-driven radio activity seems to influence the star formation rate in the selected AGNs. We discuss two possible evolutionary scenarios that might link these three AGN classes.
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