|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Environmental dependence of star formation induced by cloud collisions in a barred galaxy
| 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 |
| URI: | http://hdl.handle.net/2115/57653 |
| 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
|
