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The impact of galactic disc environment on star-forming clouds

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Title: The impact of galactic disc environment on star-forming clouds
Authors: Nguyen, Ngan K. Browse this author
Pettitt, Alex R. Browse this author
Tasker, Elizabeth J. Browse this author
Okamoto, Takashi Browse this author →KAKEN DB
Keywords: hydrodynamics
methods: numerical
ISM: clouds
ISM: structure
galaxies: star formation
galaxies: structure
Issue Date: Mar-2018
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 475
Issue: 1
Start Page: 27
End Page: 42
Publisher DOI: 10.1093/mnras/stx3143
Abstract: We explore the effect of different galactic disc environments on the properties of star-forming clouds through variations in the background potential in a set of isolated galaxy simulations. Rising, falling, and flat rotation curves expected in halo-dominated, disc-dominated, and Milky Way-like galaxies were considered, with and without an additional two-arm spiral potential. The evolution of each disc displayed notable variations that are attributed to different regimes of stability, determined by shear and gravitational collapse. The properties of a typical cloud were largely unaffected by the changes in rotation curve, but the production of small and large cloud associations was strongly dependent on this environment. This suggests that while differing rotation curves can influence where clouds are initially formed, the average bulk properties are effectively independent of the global environment. The addition of a spiral perturbation made the greatest difference to cloud properties, successfully sweeping the gas into larger, seemingly unbound, extended structures and creating large arm-interarm contrasts.
Rights: This article has been accepted for publication in "Monthly notices of the royal astronomical society" ©: 2018 Takashi Okamoto 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: 岡本 崇

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