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arXiv 0909.1106astro-ph.CO
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AGN在早型星系从蓝云向红序迁移中的作用

The role of AGN in the migration of early-type galaxies from the blue cloud to the red sequence

Kevin Schawinski

摘要:

我们提出了一个正在进行的早期型星系的形成和演化的一般图片,通过一个特定的演化序列开始在蓝色的云和结束在低质量的红色序列结束。这一演化序列包括在绿谷的Seyfert活动星系核阶段,但这一阶段在恒星形成停止后发生得太晚,因此,低红移早型星系中的大部分黑洞吸积发生在星暴后天体中,而不是与恒星形成同时发生。另一方面,低光度活动星系核阶段在早期阶段开启,当一些恒星形成活动仍然存在时,可能是破坏分子气体库的原因。

英文摘要:

We present a general picture of the ongoing formation and evolution of early-type galaxies via a specific evolutionary sequence starting in the blue cloud and ending in the low-mass end of the red sequence. This evolutionary sequence includes a Seyfert AGN phase in the green valley, but this phase occurs too late after the shutdown of star formation to be responsible for it. Thus, the bulk of black hole accretion in low-redshift early-type galaxies occurs in post-starburst objects, and not concurrent with star formation. On the other hand, a low-luminosity AGN phase switching on at an earlier stage when some star formation activity remains may be responsible for destroying the molecular gas reservoir fueling star formation.

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