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题名: MERGING GALAXIES WITH TIDAL TAILS IN COSMOS TO z=1
作者: Wen, Zhang Zheng; Zheng, Xian Zhong
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016
卷号: 832, 期号:1, 页码:90
英文摘要: Tidal tails are created in major mergers involving disk galaxies. It remains to be explored how the tidal tails trace the assembly history of massive galaxies. We identify a sample of 461 merging galaxies with long tidal tails, from 35,076 galaxies mass-complete at M-star >= 10(9.5) M-circle dot and 0.2 <= z <= 1, based on Hubble Space Telescope/ACS F814W imaging data and public catalogs of the COSMOS field. The long tails refer to those with length equal to or greater than the diameter of their host galaxies. The mergers with tidal tails are selected using our novel A(O) - D-O technique for strong asymmetric features, along with visual examination. Our results show that the fraction of tidaltailed mergers evolves mildly with redshift, as similar to(1 + z)(2.0 +/- 0.4), and becomes relatively higher in less-massive galaxies, out to z = 1. With a timescale of 0.5 Gyr for the tidal-tailed mergers, we obtain that the occurrence rate of such mergers follows 0.01 +/- 0.007 (1+ z)(2.3 + 1.4) Gyr(-1), and corresponds to similar to 0.3 events since z = 1, as well as roughly one-third of the total budget of major mergers from the literature. For disk-involved major mergers, nearly half of them have undergone a phase with long tidal tails.
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17069
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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