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The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions
Zhang,Bing-qing1,2; Cao,Chen3,4; Xu,Cong K.1,5; Zhou,Zhi-min1; Wu,Hong1,2
2020-01-28
Source PublicationPublications of the Astronomical Society of the Pacific
ISSN0004-6280
Volume132Issue:1009
AbstractAbstract 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.
Keywordgalaxies: abundances galaxies: evolution galaxies: interactions galaxies: star formation Hii regions techniques: spectroscopic
DOI10.1088/1538-3873/ab6714
Language英语
WOS IDIOP:0004-6280-132-1009-ab6714
PublisherThe Astronomical Society of the Pacific
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28731
Collection中国科学院国家天文台
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100101, People's Republic of China bqzhang@bao.ac.cn
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, 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.Shandong Key Laboratory of Optical Astronomy & Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong 264209, People's Republic of China
5.Chinese Academy of Sciences South America Center for Astronomy, China-Chile Joint Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
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).
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