Star Formation Thresholds: The View from Inside the Galaxy

被引：0

作者：

Di Francesco, James ^{[1
]}

机构：

[1] Natl Res Council Canada, Herzberg Programs Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

来源：

FROM INTERSTELLAR CLOUDS TO STAR-FORMING GALAXIES: UNIVERSAL PROCESSES? | 2015年 / 315期

关键词：

stars: formation; ISM: clouds; ISM: structure; galaxies: ISM; submillimeter; MOLECULAR CLOUD; NH3; OBSERVATIONS; FORMATION LAW; DENSE CORES; MILKY-WAY; HERSCHEL; PROTOSTARS; FILAMENTS; PACS;

D O I：

10.1017/S1743921316007481

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We explore the relationship between the total gas surface density and star formation rate surface density, a.k.a., the "Kennicutt-Schmidt relation," in a Galactic context. Specifically, we probe the origins of thresholds in the behaviour of the K-S relation at 10 M-circle dot pc(-2) and 100-200 M-circle dot pc(-2) using images from the Herschel Hi-GAL and Gould Belt surveys. In both cases, pervasive filamentary structures are seen, possibly due to turbulent motions. The Hi-GAL image supports the view that at similar to 10 M-circle dot pc(-2) gas becomes molecular, leading to the formation of clouds that harbour star formation. The GBS images suggest the 100-200 M-circle dot pc(-2) threshold originates from the nature of filaments being stable until a critical column density of similar to 160 M-circle dot pc(-2) is reached. Therefore, the transition between non-star-forming and star-forming gas in clouds (and galaxies) may be set universally by the dynamical properties of filaments.

引用

页码：183 / 190

页数：8

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