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Revisiting the Extended Schmidt Law: The Important Role of Existing Stars in Regulating Star Formation
Shi, Yong1,2; Yan, Lin3; Armus, Lee3; Gu, Qiusheng1,2; Helou, George3; Qiu, Keping1,2; Gwyn, Stephen4; Stierwalt, Sabrina5; Fang, Min6,7; Chen, Yanmei1,2; Zhou, Luwenjia1; Wu, Jingwen8; Zheng, Xianzhong9; Zhang, Zhi-Yu10; Gao, Yu9; Wang, Junzhi11
2018-02-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume853Issue:2Pages:9
Abstract

We revisit the proposed extended Schmidt law, which posits that the star formation efficiency in galaxies depends on the stellar mass surface density, by investigating spatially resolved star formation rates (SFRs), gas masses, and stellar masses of star formation regions in a vast range of galactic environments, from the outer disks of dwarf galaxies, to spiral disks and to merging galaxies, as well as individual molecular clouds in M33. We find that these regions are distributed in a tight power law as Sigma(SFR) proportional to (Sigma(0.5)(star)Sigma(gas))(1.09), which is also valid for the integrated measurements of disk and merging galaxies at high-z. Interestingly, we show that star formation regions in the outer disks of dwarf galaxies with Sigma(SFR) down to 10(-5) M(circle dot)yr(-1) kpc(-2), which are outliers of both the Kennicutt-Schmidt and Silk-Elmegreen laws, also follow the extended Schmidt law. Other outliers in the Kennicutt-Schmidt law, such as extremely metal-poor star formation regions, also show significantly reduced deviation from the extended Schmidt law. These results suggest an important role for existing stars in helping to regulate star formation through the effect of their gravity on the midplane pressure in a wide range of galactic environments.

Keywordgalaxies: evolution galaxies: starburst ISM: atoms ISM: molecules stars: formation
DOI10.3847/1538-4357/aaa3e6
WOS KeywordNEARBY GALAXIES ; H-I ; FORMATION EFFICIENCY ; INFRARED GALAXIES ; FORMING GALAXIES ; FORMATION RATES ; GALACTIC DISKS ; POOR GALAXIES ; GAS ; CALIBRATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000424011300010
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22197
Collection中国科学院紫金山天文台
Corresponding AuthorShi, Yong
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.CALTECH, Infrared Proc & Anal Ctr, 1200 E Calif Blvd, Pasadena, CA 91125 USA
4.Natl Res Council Canada, NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
5.Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA
6.Univ Arizona, Dept Astron, 933 N Cherry Ave, Tucson, AZ 85721 USA
7.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
8.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing, Peoples R China
9.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
10.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
11.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Shi, Yong,Yan, Lin,Armus, Lee,et al. Revisiting the Extended Schmidt Law: The Important Role of Existing Stars in Regulating Star Formation[J]. ASTROPHYSICAL JOURNAL,2018,853(2):9.
APA Shi, Yong.,Yan, Lin.,Armus, Lee.,Gu, Qiusheng.,Helou, George.,...&Wang, Junzhi.(2018).Revisiting the Extended Schmidt Law: The Important Role of Existing Stars in Regulating Star Formation.ASTROPHYSICAL JOURNAL,853(2),9.
MLA Shi, Yong,et al."Revisiting the Extended Schmidt Law: The Important Role of Existing Stars in Regulating Star Formation".ASTROPHYSICAL JOURNAL 853.2(2018):9.
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