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Stellar and gas mass distributions for understanding the nature of spiral arms

Published online by Cambridge University Press:  10 June 2020

Fumi Egusa ,
Erin Mentuch Cooper ,
Jin Koda  and
Junichi Baba
Fumi Egusa
Affiliation:
Institute of Astronomy, University of Tokyo, Mitaka, Tokyo181-0015, Japan email: fegusa@ioa.s.u-tokyo.ac.jp
Erin Mentuch Cooper
Affiliation:
University of Texas at Austin, Austin, Texas78712-1205, USA
Jin Koda
Affiliation:
State University of New York Stony Brook, Stony Brook, New York11794-3800, USA
Junichi Baba
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo181-8588, Japan
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Abstract

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Numerical simulations of disk galaxies with steady (long-lived) and dynamic (short-lived) spiral arms suggest that offsets between stellar and gas spiral arms depend on their nature or lifetime (Baba et al.2015). Based on this theoretical study, we investigated gas-star offsets in the nearby grand-design spiral galaxy M51, and found that its two spiral arms exhibit different offset dependences against radius. One arm is consistent with a steady arm, while the other is consistent with a dynamic arm. We deduce that this difference is likely due to a tidal interaction with the companion galaxy (Egusa et al.2017). For this study, a stellar mass distribution with a high accuracy at a high spatial resolution is essential, which has come to be available by applying recent SED fitting techniques to multi-wavelength images. We are now working to extend this study to other nearby spiral galaxies.

Keywords

galaxies: individual (M51 or NGC 5194M74 or NGC 0628)galaxies: spiralgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 266 - 267
Copyright
© International Astronomical Union 2020

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