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Resolved Stellar Populations of the interacting galaxies of the M81 group

Published online by Cambridge University Press:  21 March 2017

Sakurako Okamoto ,
Nobuo Arimoto ,
Annette M.N. Ferguson ,
Edouard J. Bernard ,
Mike J. Irwin ,
Yoshihiko Yamada  and
Yousuke Utsumi
Sakurako Okamoto
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Nobuo Arimoto
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Annette M.N. Ferguson
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Edouard J. Bernard
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Mike J. Irwin
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Yoshihiko Yamada
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
Yousuke Utsumi
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80, Nandan Rd. Shanghai, China email: sakurako.okamoto@gmail.com
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Abstract

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We present the results from the state-of-the-art wide-field survey of the M81 galaxy group that we are conducting with Hyper Suprime-Cam on Subaru Telescope. Our photometry reaches about 2 mag below the tip of the red giant branch (RGB) and reveals the spatial distribution of both old and young stars over an area of 5°2 around the M81. The young main-sequence (MS) stars closely follow the HI distribution and can be found in a stellar stream between M81 and NGC 3077 and in numerous outlying stellar associations. Our survey also reveals for the first time the very extended (>2 × R25) halos of RGB stars around M81, M82, and NGC 3077, as well as faint tidal streams that link these systems. The gravitational interactions between M81, M82 and NGC 3077 galaxies induced star formation in tidally stripped gas, and also significantly perturbed the older stellar components leading to disturbed halo morphologies.

Keywords

galaxies: individual (M81, M82, NGC 3077)galaxies: interactionsgalaxies: photometrygalaxies: stellar contentgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 22 - 24
Copyright
Copyright © International Astronomical Union 2017 

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