用CAS探索70亿年来星系相互作用的影响
Exploring the Impact of Galaxy Interactions over Seven Billion Years with CAS
摘要：
我们探索星系组装在过去的70亿年中，通过表征“正常”星系沿哈勃序列，对强烈干扰合并/相互作用的星系与广泛使用的CAS系统的浓度（C），不对称性（A），和“块状”（S）参数，以及视觉分类。我们分析了哈勃空间望远镜（HST）ACS从GEMS调查中获得的约4000个中等和高质量（> 10^9太阳质量）星系的图像，这是迄今为止在两个过滤器中进行的最大的HST调查之一。我们探讨了CAS判据[A>S和A>~0.35]在分离不同红移的正常星系和强扰动星系中的有效性，并量化了恢复率和污染率。我们还比较了平均恒星形成率和宇宙恒星形成率密度作为正常和相互作用系统之间的红移的函数由CAS确定。
英文摘要：
We explore galaxy assembly over the last seven billion years by characterizing "normal" galaxies along the Hubble sequence, against strongly disturbed merging/interacting galaxies with the widely used CAS system of concentration (C), asymmetry (A), and 'clumpiness' (S) parameters, as well as visual classification. We analyze Hubble Space Telescope (HST) ACS images of ~4000 intermediate and high mass (> 10^9 solar masses) galaxies from the GEMS survey, one of the largest HST surveys conducted to date in two filters. We explore the effectiveness of the CAS criteria [A>S and A>~0.35] in separating normal and strongly disturbed galaxies at different redshifts, and quantify the recovery and contamination rate. We also compare the average star formation rate and the cosmic star formation rate density as a function of redshift between normal and interacting systems identified by CAS.
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