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New structures of the Milky Way stellar and dark halos revealed from the Subaru/Hyper Suprime-Cam survey

Published online by Cambridge University Press:  14 May 2020

Masashi Chiba Open the ORCID record for Masashi Chiba [Opens in a new window]
Masashi Chiba*
Affiliation:
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan email: chiba@astr.tohoku.ac.jp
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Abstract

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We present the recent discovery of new halo structures in the Milky Way (MW) based on the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP). HSC is a wide-field imager installed at the prime focus of the Subaru Telescope, and a 300-night survey with this instrument is being carried out in this program. The combination of the superb image quality and depth and the fact that it is a multi-band survey allows us to identify new faint satellites as well as field halo stars in the outskirts of the MW halo beyond the reach of previous surveys. We report here on the new insights into the nature of both stellar and dark halos in the MW as revealed from this on-going survey program and show prospects based on the upcoming large spectroscopic survey with Subaru Prime Focus Spectrograph.

Keywords

Galaxy: haloformationcosmology: dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 83 - 90
Copyright
© International Astronomical Union 2020

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