Bivariate Luminosity Function of Galaxy Pairs

doi:10.3847/1538-4357/ab24da

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	Bivariate Luminosity Function of Galaxy Pairs
	Feng,Shuai 1,2; Shen,Shi-Yin 1,3; Yuan,Fang-Ting 1; Luo,A-Li 4; Zhang,Jian-Nan 4; Wang,Meng-Xin 4; Wang,Xia 4; Li,Yin-Bi 4; Hou,Wen 4; Kong,Xiao 4
刊名	The Astrophysical Journal
	2019-07-31
卷号	880 期号:2
关键词	galaxies: interactions galaxies: luminosity function, mass function
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab24da
英文摘要	Abstract We measure the bivariate luminosity function (BLF) of galaxy pairs and use it to probe and characterize the galaxy–galaxy interaction between pair members. The galaxy pair sample is selected from the main galaxy sample of Sloan Digital Sky Survey and supplied with a significant number of redshifts from the LAMOST spectral and GAMA surveys. We find the BLFs depend on the projected distance dp between pair members. At large separation dp?>?150 h?1 kpc, the BLF degenerates into a luminosity function of single galaxies, indicating few interactions between pair members. At 100 h?1 kpc?≤?dp?≤?150 h?1 kpc, the BLF starts to show a correlation between pair members, in the sense that the shape of the conditional luminosity function (CLF) of one member galaxy starts to depend on the luminosity of the other member galaxy. Specifically, the CLF with a brighter companion has a steeper faint-end slope, which becomes even more significant at 50 h?1 kpc?≤?dp?≤?100 h?1 kpc. This behavior is consistent with the scenario—and also is the observational evidence—that dynamic friction drives massive major merger pairs to merge more quickly. At close distance dp?≤?50 h?1 kpc, aside from the merging timescale effect, the BLF also shows an overall brightening of ΔMr?≥?0.04 mag, which reveals the enhanced star formation of the close-pair phase. By combining this with the statistical conclusion that the star formation rate of late-type galaxies in close pairs is enhanced at a level of about 40%, we further conclude that the average starburst timescale of close pairs is as long as 0.4 Gyr.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-880-2-AB24DA
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27151]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; ssy@shao.ac.cn 2.University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, People’s Republic of China 3.Key Lab for Astrophysics, Shanghai 200234, People’s Republic of China 4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
推荐引用方式 GB/T 7714	Feng,Shuai,Shen,Shi-Yin,Yuan,Fang-Ting,et al. Bivariate Luminosity Function of Galaxy Pairs[J]. The Astrophysical Journal,2019,880(2).
APA	Feng,Shuai.,Shen,Shi-Yin.,Yuan,Fang-Ting.,Luo,A-Li.,Zhang,Jian-Nan.,...&Zuo,Fang.(2019).Bivariate Luminosity Function of Galaxy Pairs.The Astrophysical Journal,880(2).
MLA	Feng,Shuai,et al."Bivariate Luminosity Function of Galaxy Pairs".The Astrophysical Journal 880.2(2019).