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How do different spiral arm models impact the ISM and GMC population?

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Title: How do different spiral arm models impact the ISM and GMC population?
Authors: Pettitt, Alex R. Browse this author
Dobbs, Clare L. Browse this author
Baba, Junichi Browse this author
Colombo, Dario Browse this author
Duarte-Cabral, Ana Browse this author
Egusa, Fumi Browse this author
Habe, Asao Browse this author →KAKEN DB
Keywords: methods: numerical
ISM: clouds
ISM: structure
galaxies: ISM
galaxies: spiral
galaxies: structure
Issue Date: Oct-2020
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 498
Issue: 1
Start Page: 1159
End Page: 1174
Publisher DOI: 10.1093/mnras/staa2242
Abstract: The nature of galactic spiral arms in disc galaxies remains elusive. Regardless of the spiral model, arms are expected to play a role in sculpting the star-forming interstellar medium (ISM). As such, different arm models may result in differences in the structure of the ISM and molecular cloud properties. In this study, we present simulations of galactic discs subject to spiral arm perturbations of different natures. We find very little difference in how the cloud population or gas kinematics vary between the different grand design spirals, indicating that the ISM on cloud scales cares little about where spiral arms come from. We do, however, see a difference in the interarm/arm mass spectra, and minor differences in tails of the distributions of cloud properties (as well as radial variations in the stellar/gaseous velocity dispersions). These features can be attributed to differences in the radial dependence of the pattern speeds between the different spiral models, and could act as a metric of the nature of spiral structure in observational studies.
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 Alex R Pettitt, Clare L Dobbs, Junichi Baba, Dario Colombo, Ana Duarte-Cabral, Fumi Egusa, Asao Habe Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:高等教育推進機構 (Institute for the Advancement of Higher Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)


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