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THE INTRINSIC SCATTER ALONG THE MAIN SEQUENCE OF STAR-FORMING GALAXIES AT z similar to 0.7
Guo, Kexin1,2; Zheng, Xian Zhong1; Fu, Hai3
2013-11-20
Source PublicationASTROPHYSICAL JOURNAL
Volume778Issue:1
AbstractA 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.
KeywordGalaxies: Evolution Galaxies: Starburst Infrared: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/778/1/23
WOS KeywordSPECTRAL 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
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000327131700023
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15522
Collection分子云与恒星形成研究团组
Affiliation1.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
Recommended Citation
GB/T 7714
Guo, Kexin,Zheng, Xian Zhong,Fu, Hai. THE INTRINSIC SCATTER ALONG THE MAIN SEQUENCE OF STAR-FORMING GALAXIES AT z similar to 0.7[J]. ASTROPHYSICAL JOURNAL,2013,778(1).
APA Guo, Kexin,Zheng, Xian Zhong,&Fu, Hai.(2013).THE INTRINSIC SCATTER ALONG THE MAIN SEQUENCE OF STAR-FORMING GALAXIES AT z similar to 0.7.ASTROPHYSICAL JOURNAL,778(1).
MLA Guo, Kexin,et al."THE INTRINSIC SCATTER ALONG THE MAIN SEQUENCE OF STAR-FORMING GALAXIES AT z similar to 0.7".ASTROPHYSICAL JOURNAL 778.1(2013).
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