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The Missing Satellite Problem outside of the Local Group. II. Statistical Properties of Satellites of Milky Way-like Galaxies
| Title: | The Missing Satellite Problem outside of the Local Group. II. Statistical Properties of Satellites of Milky Way-like Galaxies |
| Authors: | Nashimoto, Masashi Browse this author | | Tanaka, Masayuki Browse this author | | Chiba, Masashi Browse this author | | Hayashi, Kohei Browse this author | | Komiyama, Yutaka Browse this author | | Okamoto, Takashi Browse this author →KAKEN DB |
| Issue Date: | 29-Aug-2022 |
| Publisher: | IOP Publishing |
| Journal Title: | The Astrophysical journal |
| Volume: | 936 |
| Issue: | 1 |
| Start Page: | 38 |
| Publisher DOI: | 10.3847/1538-4357/ac83a4 |
| Abstract: | We present a new observation of satellite galaxies around seven Milky Way (MW)-like galaxies located outside of the Local Group (LG) using Subaru/Hyper Suprime-Cam imaging data to statistically address the missing satellite problem. We select satellite galaxy candidates using magnitude, surface brightness, Sersic index, axial ratio, FWHM, and surface brightness fluctuation cuts, followed by visual screening of false positives such as optical ghosts of bright stars. We identify 51 secure dwarf satellite galaxies within the virial radius of nine host galaxies, two of which are drawn from the pilot observation presented in Paper I. We find that the average luminosity function of the satellite galaxies is consistent with that of the MW satellites, although the luminosity function of each host galaxy varies significantly. We observe an indication that more massive hosts tend to have a larger number of satellites. Physical properties of the satellites such as the size-luminosity relation are also consistent with the MW satellites. However, the spatial distribution is different; we find that the satellite galaxies outside of the LG show no sign of concentration or alignment, while that of the MW satellites is more concentrated around the host and exhibits a significant alignment. As we focus on relatively massive satellites with M ( V ) < -10, we do not expect that the observational incompleteness can be responsible here. This trend might represent a peculiarity of the MW satellites, and further work is needed to understand its origin. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86815 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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