The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions

doi:10.1088/1538-3873/ab6714

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	The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions
	Zhang,Bing-qing 4,5; Cao,Chen 2,3; Xu,Cong K.1,5; Zhou,Zhi-min 5; Wu,Hong 4,5
刊名	Publications of the Astronomical Society of the Pacific
	2020-01-28
卷号	132 期号:1009
关键词	galaxies: abundances galaxies: evolution galaxies: interactions galaxies: star formation Hii regions techniques: spectroscopic
ISSN号	0004-6280
DOI	10.1088/1538-3873/ab6714
英文摘要	Abstract We use the Multi-Object Spectroscopy system of Xinglong 2.16 m telescope to study the gradients of gas-phase oxygen abundance and the distributions of star formation activities of seven nearby interacting galaxy pairs. On the basis of emission line luminosities and flux ratios, we estimate the gas-phase metallicities (log(O/H)), excitation mechanisms, and star formation rates (SFRs) of different regions in each galaxy. The average radial slope of log(O/H) from linear fitting of galaxy pairs in our sample is significantly flatter than that of isolated disk galaxies, also the central metallicity is much lower for interacting galaxies. This supports the predictions and results of previous theoretical numerical simulations and observational works which show the cold gas inflows induced by galaxy interactions can dilute the central metallicity. From the analysis of the radial distribution of SFR surface densities (ΣSFR), we find that, in our sample, galaxies in Spiral–Spiral (S+S) pairs have peak ΣSFR at the center region and lower SFRs at the outer parts than that at the center. On the other hand, for two spirals in Spiral-Elliptical (S+E) pairs (Arp142 and J0338+2120), they both have relatively higher (ΣSFR) in their off-nuclei regions. This may hint a dependence of star formation distributions for paired galaxies on their companion morphologies.
语种	英语
出版者	The Astronomical Society of the Pacific
WOS记录号	IOP:0004-6280-132-1009-AB6714
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/28730]
专题	中国科学院国家天文台
作者单位	1.Chinese Academy of Sciences South America Center for Astronomy, China-Chile Joint Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile 2.Shandong Key Laboratory of Optical Astronomy & Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong 264209, People's Republic of China 3.School of Space Science and Physics, Shandong University, Weihai, Shandong 264209, People's Republic of China; caochen@sdu.edu.cn 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 5.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100101, People's Republic of China bqzhang@bao.ac.cn
推荐引用方式 GB/T 7714	Zhang,Bing-qing,Cao,Chen,Xu,Cong K.,et al. The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions[J]. Publications of the Astronomical Society of the Pacific,2020,132(1009).
APA	Zhang,Bing-qing,Cao,Chen,Xu,Cong K.,Zhou,Zhi-min,&Wu,Hong.(2020).The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions.Publications of the Astronomical Society of the Pacific,132(1009).
MLA	Zhang,Bing-qing,et al."The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions".Publications of the Astronomical Society of the Pacific 132.1009(2020).