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题名: SIMS ANALYSIS OF OH AND D/H OF APATITES FROM EUCRITES.
作者: Guan, Yunbin1; Wang Ying(王英)2; Hsu, Weibiao2; Eiler, John M.1
刊名: METEORITICS & PLANETARY SCIENCE
出版日期: 2015-08-01
卷号: 50, 页码:0
学科分类: 天文和天体物理
文章类型: Meeting Abstract
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]: Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
收录类别: SCI ; ISTP
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000358591900117
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14865
Appears in Collections:天体化学和行星科学实验室_期刊论文

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作者单位: 1.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
2.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
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