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Discovery of new dwarf galaxies around NGC4631 with Subaru/Hyper Suprime-Cam

Published online by Cambridge University Press:  09 May 2016

Mikito Tanaka ,
Masashi Chiba  and
Yutaka Komiyama
Mikito Tanaka
Affiliation:
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan email: mikito@astr.tohoku.ac.jp
Masashi Chiba
Affiliation:
Astronomical Institute, Tohoku University, Sendai, Japan
Yutaka Komiyama
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan
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Abstract

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We have observed on-going interacting galaxies (NGC4631 and NGC4656) using Subaru/Hyper Suprime-Cam and reduced the data using HSC pipeline and conducted photometry based on DAOphot. Then, we have detected 8 new dwarf galaxy candidates in the outer region of NGC4631 and confirmed the three candidates previously reported by Karachentsev et al. 2014. The 3 or 4 candidates detected in this study may be a star-forming dwarf irregular galaxy and the other 7 candidates may be an old dwarf spheroidal galaxy based on these stellar populations. It looks like that the effective radius - absolute magnitude relation of dwarf galaxies in NGC4631 group is similar to the relation of the Local Group and the other galaxy systems.

Keywords

galaxies: dwarf – galaxies: stellar content – galaxies: halo – galaxies: individual (NGC 4631, NGC 4656)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 350 - 351
Copyright
Copyright © International Astronomical Union 2016 

References

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