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Environmental dependence of star formation induced by cloud collisions in a barred galaxy

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Title: Environmental dependence of star formation induced by cloud collisions in a barred galaxy
Authors: Fujimoto, Yusuke Browse this author
Tasker, Elizabeth J. Browse this author
Habe, Asao Browse this author →KAKEN DB
Keywords: hydrodynamics
methods: numerical
ISM: clouds
ISM: structure
galaxies: star formation
galaxies: structure
Issue Date: 21-Nov-2014
Publisher: Oxford University Press
Journal Title: Monthly notices of the Royal Astronomical Society
Volume: 445
Issue: 1
Start Page: L65
End Page: L69
Publisher DOI: 10.1093/mnrasl/slu138
Abstract: Cloud collision has been proposed as a way to link the small-scale star formation process with the observed global relation between the surface star formation rate and gas surface density. We suggest that this model can be improved further by allowing the productivity of such collisions to depend on the relative velocity of the two clouds. Our adjustment implements a simple step function that results in the most successful collisions being at the observed velocities for triggered star formation. By applying this to a high-resolution simulation of a barred galaxy, we successfully reproduce the observational result that the star formation efficiency (SFE) in the bar is lower than that in the spiral arms. This is not possible when we use an efficiency dependent on the internal turbulence properties of the clouds. Our results suggest that high-velocity collisions driven by the gravitational pull of the clouds are responsible for the low bar SFE.
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 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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