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题名: THE INTRINSIC SCATTER ALONG THE MAIN SEQUENCE OF STAR-FORMING GALAXIES AT z similar to 0.7
作者: Guo, Kexin1, 2; Zheng, Xian Zhong1; Fu, Hai3
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2013-11-20
卷号: 778, 期号:1
关键词: galaxies: evolution ; galaxies: starburst ; infrared: galaxies
DOI: 10.1088/0004-637X/778/1/23
文章类型: Article
英文摘要: A sample of 12,614 star-forming galaxies (SFGs) with stellar mass >10(9.5) M-circle dot between 0.6 < z < 0.8 from COSMOS is selected to study the intrinsic scatter of the correlation between star formation rate (SFR) and stellar mass. We derive SFR from ultraviolet (UV) and infrared (IR) luminosities. A stacking technique is adopted to measure IR emission for galaxies undetected at 24 mu m. We confirm that the slope of the mass-SFR relation is close to unity. We examine the distributions of specific SFRs (SSFRs) in four equally spaced mass bins from 10(9.5) M-circle dot to 10(11.5) M-circle dot. Different models are used to constrain the scatter of SSFR for lower mass galaxies that are mostly undetected at 24 mu m. The SFR scatter is dominated by the scatter of UV luminosity and gradually that of IR luminosity at increasing stellar mass. We derive SSFR dispersions of 0.18, 0.21, 0.26, and 0.31 dex with a typical measurement uncertainty of less than or similar to 0.01 dex for the four mass bins. Interestingly, the scatter of the mass-SFR relation seems not constant in the sense that the scatter in SSFR is smaller for SFGs of stellar mass <10(10.5) M-circle dot. If confirmed, this suggests that the physical processes governing star formation become systematically less violent for less massive galaxies. The SSFR distribution for SFGs with intermediate mass 10(10)-10(10.)5 M-circle dot is characterized by a prominent excess of intense starbursts in comparison with other mass bins. We argue that this feature reflects that both violent (e.g., major/minor mergers) and quiescent processes are important in regulating star formation in this intermediate-mass regime.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SPECTRAL ENERGY-DISTRIBUTIONS ; LESS-THAN 2 ; INFRARED LUMINOSITY FUNCTIONS ; ACTIVE GALACTIC NUCLEI ; AEGIS FIELD GALAXIES ; LYMAN BREAK GALAXIES ; STELLAR MASS DENSITY ; COSMOS FIELD ; MU-M ; FORMATION HISTORIES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000327131700023
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15522
Appears in Collections:分子云与恒星形成研究团组_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.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
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