The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676

doi:10.3847/1538-4357/ab6f02

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	The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676
	Zhou,Zhimin 1; Ma,Jun 1,2; Zhou,Xu 1; Wu,Hong 1,2
刊名	The Astrophysical Journal
	2020-02-20
卷号	890 期号:2
关键词	Early-type galaxies Galaxy evolution Lenticular galaxies
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab6f02
英文摘要	Abstract The lenticular galaxy IC 676 is a barred galaxy with double nuclei and active star formation in the central region. In this work we present the long-slit spectroscopy and archival multiwavelength images to investigate the nature and origin of the double nuclei in IC 676. Through photometric 1D brightness profiles and 2D image decomposition, we show that this galaxy consists of a stellar bar with the length of ～2.5 kpc and two Sérsic disks both of which with Sérsic index n?～?1.3. There is probably little or no bulge component assembled in IC 676. The luminosities of the double nuclei are primarily dominated by young stellar populations within the ages of 1–10 Myr. The northern nucleus has stronger star formation activity than the southern one. The surface densities of the star formation rate in the double nuclei are similar to those in starburst galaxies or the circumnuclear star-forming regions in spiral galaxies. Each of the double nuclei in IC 676 likely consists of young massive star clusters, which can be resolved as bright knots in the Hubble Space Telescope high-resolution image. Our results suggest that IC 676 likely has a complex formation and evolutionary history. The secular processes driven by the stellar bar and external accretion may dominate the formation and evolution of its double nuclei. This indicates that the secular evolution involving the internal and external drivers may have an important contribution for the evolution of lenticular galaxies.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-890-2-AB6F02
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/53980]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People's Republic of China; zmzhou@nao.cas.cn 2.College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
推荐引用方式 GB/T 7714	Zhou,Zhimin,Ma,Jun,Zhou,Xu,et al. The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676[J]. The Astrophysical Journal,2020,890(2).
APA	Zhou,Zhimin,Ma,Jun,Zhou,Xu,&Wu,Hong.(2020).The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676.The Astrophysical Journal,890(2).
MLA	Zhou,Zhimin,et al."The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676".The Astrophysical Journal 890.2(2020).