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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

Gilmore, et al. 2007, ApJ, 663, 948CrossRefGoogle Scholar
Ibata, et al. 2013, Nature, 493, 62Google Scholar
Pawlowski, et al. 2012, MNRAS, 423, 1109Google Scholar
Tanaka, et al. 2011, ApJ, 738, 150Google Scholar
Tikhonov, et al. 2006, astro-ph/0603457Google Scholar
Karachentsev, et al. 2014, astro-ph/1401.2719Google Scholar