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题名: THE STAR FORMATION MAIN SEQUENCE: THE DEPENDENCE OF SPECIFIC STAR FORMATION RATE AND ITS DISPERSION ON GALAXY STELLAR MASS
作者: Guo, Kexin1, 2; Zheng, Xian Zhong1; Wang, Tao3, 4; Fu, Hai5
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2015-08-01
卷号: 808, 期号:2, 页码:L49
关键词: galaxies: evolution ; galaxies: starburst ; infrared: galaxies
学科分类: 天文和天体物理
DOI: 10.1088/2041-8205/808/2/L49
文章类型: Article
英文摘要: The dispersion of the star formation main sequence (SFMS) reflects the diversity of star formation histories (SFHs) and variation in star formation rates (SFRs) in star-forming galaxies (SFGs) with similar stellar masses (M*). We examine the dispersion of the local SFMS using a complete sample of Sloan Digital Sky Survey galaxies at 0.01 < z < 0.03 with log(M* / M-circle dot) > 8.8. The SFRs are estimated from Ha in combination with 22 mu m observation from the Wide-field Infrared Survey Explorer. We measure the dispersion of specific SFRs (sSFRs) as a function of M*. We confirm that the dispersion increases with M* from 0.37 +/- 0.01 dex at log(M* / M-circle dot) < 9.6 to 0.51 +/- 0.02 dex at log(M* / M-circle dot) > 10.2. Despite star formation being mostly associated with disks, the dispersion of disk sSFR still increases with M*. We conclude that the presence of bulges/bars is likely responsible for the large dispersion of sSFR in massive SFGs, while low-mass SFGs are mostly disk dominated and thus have a small dispersion. Our results suggest that star formation on galactic scales is dramatically affected by central dense structures through both enhancing and/or quenching processes, while lower-mass SFGs tend to have less bursty SFHs. However, the dispersion of the sSFR becomes significantly smaller and remains constant when only disk-dominated SFGs are counted. This finding implies that the impact of stochastic stellar feedback on star formation is likely to follow the same pattern in all disk galaxies, showing no correlation with halo potential.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DIGITAL SKY SURVEY ; FORMATION RATE INDICATORS ; FORMING GALAXIES ; ULTRAVIOLET EXTINCTION ; INFRARED TRACERS ; DATA RELEASE ; EVOLUTION ; BULGE ; CATALOG ; ORIGIN
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000358938800017
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14846
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CEA DSM Irfu, Lab AIM Paris Saclay, F-91191 Gif Sur Yvette, France
4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
5.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
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