The effect of photoionizing feedback on star formation in isolated and colliding clouds

PASJ: Publications of the Astronomical Society of Japan

Shima, Kazuhiro¹  Habe, Asao¹  Tasker, Elizabeth J²  Federrath, Christoph³ 

[1] Department of Physics, Faculty of Science, Hokkaido University, Kita 10 Nishi 8 Kita-ku, Sapporo 060-0810, Japan;Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia

关键词: methods: numerical;    stars: formation;    ISM: clouds;   

DOI  :  10.1093/pasj/psx124

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We investigate star formation occurring in idealized giant molecular clouds, comparing structures that evolve in isolation versus those undergoing a collision. Two different collision speeds are investigated and the impact of photoionizing radiation from the stars is determined. We find that a colliding system leads to more massive star formation both with and without the addition of feedback, raising overall star formation efficiencies (SFE) by a factor of 10 and steepening the high-mass end of the stellar mass function. This rise in SFE is due to increased turbulent compression during the cloud collision. While feedback can both promote and hinder star formation in an isolated system, it increases the SFE by approximately 1.5 times in the colliding case when the thermal speed of the resulting H ii regions matches the shock propagation speed in the collision.

【 授权许可】

CC BY