IMACS星系团建立巡天：V.来自定量星系形态学的星暴再循环的进一步证据
The IMACS Cluster Building Survey: V. Further Evidence for Starburst Recycling from Quantitative Galaxy Morphologies
摘要：
使用$J$和$K_s$波段成像作为IMACS星系团建筑巡天（ICBS）的一部分，我们测量了$0.31 < z < 0.54$的2160个场星系和星系团星系的Sérsic指数。使用质量和星等有限的样品，我们比较光谱确定的被动，连续恒星形成，星爆，和poststarburst系统的分布，并表明这些类型之间的先前建立的空间和统计连接延伸到他们的总形态。在星团核心之外，我们发现恒星暴和持续恒星形成之间以及恒星暴后和被动类型之间存在密切的结构联系，但恒星暴和恒星暴后之间没有联系。这些结果独立地支持ICBS系列论文II中提出的两个结论（Dressler等人）：1)大多数星爆是对全球环境不敏感的非破坏性触发机制的产物，如小合并; 2）星爆和后星爆通常分别代表“正常”恒星形成和静止星系生命中的短暂阶段，它们在封闭的“循环”回路中起源和返回这些系统。在这张照片中，光谱上确认的后恒星暴增只占所有最近终止的恒星暴增的一小部分，这在很大程度上排除了典型的恒星暴增在所有环境中都是猝灭事件的可能性。
英文摘要：
Using $J$ and $K_s$ band imaging obtained as part of the IMACS Cluster Building Survey (ICBS) we measure Sérsic indices for 2160 field and cluster galaxies at $0.31 < z < 0.54$. Using both mass- and magnitude-limited samples, we compare the distributions for spectroscopically determined passive, continuously starforming, starburst, and poststarburst systems and show that previously established spatial and statistical connections between these types extend to their gross morphologies. Outside of cluster cores, we find close structural ties between starburst and continuously starforming, as well as poststarburst and passive types, but not between starbursts and poststarbursts. These results independently support two conclusions presented in Paper II of this ICBS series (Dressler et al.): 1) most starbursts are the product of a non-disruptive triggering mechanism that is insensitive to global environment, such as minor-mergers; 2) starbursts and poststarbursts generally represent transient phases in the lives of "normal" starforming and quiescent galaxies, respectively, originating from and returning to these systems in closed "recycling" loops. In this picture, spectroscopically identified poststarbursts constitute a minority of all recently terminated starbursts, largely ruling-out the typical starburst as a quenching event in all but the densest environments.
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