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Does feedback help or hinder star formation? The effect of photoionization on star formation in giant molecular clouds

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Title: Does feedback help or hinder star formation? The effect of photoionization on star formation in giant molecular clouds
Authors: Shima, Kazuhiro Browse this author
Tasker, Elizabeth J. Browse this author
Habe, Asao Browse this author →KAKEN DB
Keywords: methods: numerical
stars: formation
ISM: clouds
Issue Date: May-2017
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 467
Issue: 1
Start Page: 512
End Page: 523
Publisher DOI: 10.1093/mnras/stw3279
Abstract: We investigated the effect of photoionizing feedback inside turbulent star-forming clouds, comparing the resultant star formation in both idealized profiles and more realistic cloud structures drawn from a global galaxy simulation. We performed a series of numerical simulations that compared the effect of star formation alone, photoionization and photoionization plus supernovae feedback. In the idealized cloud, photoionization suppresses gas fragmentation at early times, resulting in the formation of more massive stars and an increase in the star formation efficiency. At later times, the dispersal of the dense gas causes the radiative feedback effect to switch from positive to negative as the star formation efficiency drops. In the cloud extracted from the global simulation, the initial cloud is heavily fragmented prior to the stellar-feedback beginning and is largely structurally unaffected by the late injection of radiation energy. The result is a suppression of the star formation. We conclude that the efficiency of feedback is heavily dependent on the gas structure, with negative feedback dominating when the density is high.
Rights: This article has been accepted for publication in Monthly notices of the royal astronomical society ©: 2016 The Authors Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 羽部 朝男

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