A NEW MILKY WAY SATELLITE DISCOVERED IN THE SUBARU/HYPER SUPRIME-CAM SURVEY

doi:10.3847/0004-637X/832/1/21

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	A NEW MILKY WAY SATELLITE DISCOVERED IN THE SUBARU/HYPER SUPRIME-CAM SURVEY
	Homma, Daisuke 3; Chiba, Masashi 3; Okamoto, Sakurako 2; Komiyama, Yutaka 1,9; Tanaka, Masayuki 1; Tanaka, Mikito 3; Ishigaki, Miho N.8; Akiyama, Masayuki 3; Arimoto, Nobuo 7,9; Garmilla, Jose A.6
刊名	ASTROPHYSICAL JOURNAL
	2016-11-20
卷号	832 期号:1
关键词	Galaxies: Dwarf Galaxies: Individual (Virgo) Local Group
ISSN号	0004-637X
DOI	10.3847/0004-637X/832/1/21
英文摘要	We report the discovery of a new ultra-faint dwarf satellite companion of the Milky Way (MW) based on the early survey data from the Hyper Suprime-Cam Subaru Strategic Program. This new satellite, Virgo. I, which is located in the constellation of Virgo, has been identified as a statistically significant (5.5 sigma) spatial overdensity of star-like objects with a well-defined main sequence and red giant branch in the. color-magnitude diagram. The significance of this overdensity increases to 10.8 sigma when the relevant isochrone filter is adopted for the search. Based on the distribution of the stars around the likely main-sequence turnoff at r similar to 24 mag, the distance to Virgo. I is estimated as 87 kpc, and its most likely absolute magnitude calculated from a Monte Carlo analysis is M-V =. -0.8 +/- 0.9 mag. This stellar system has an extended spatial distribution with a half-light radius of 38(-11)(+12) pc, which clearly distinguishes it from a globular cluster with comparable luminosity. Thus, Virgo. I is one of the faintest dwarf satellites known and is located beyond the reach of the Sloan Digital Sky Survey. This demonstrates the power of this survey program to identify very faint dwarf satellites. This discovery of Virgo. I is based only on about 100 square degrees of data, thus a large number of faint dwarf satellites are likely to exist in the outer halo of the MW.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000388603600003
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32691]
专题	中国科学院上海天文台
通讯作者	Homma, Daisuke
作者单位	1.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 2.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan 4.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan 5.Nagoya Univ, Inst Adv Res, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan 6.Princeton Univ Observ, Peyton Hall, Princeton, NJ 08544 USA 7.Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA 8.Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan 9.Grad Univ Adv Studies, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan
推荐引用方式 GB/T 7714	Homma, Daisuke,Chiba, Masashi,Okamoto, Sakurako,et al. A NEW MILKY WAY SATELLITE DISCOVERED IN THE SUBARU/HYPER SUPRIME-CAM SURVEY[J]. ASTROPHYSICAL JOURNAL,2016,832(1).
APA	Homma, Daisuke.,Chiba, Masashi.,Okamoto, Sakurako.,Komiyama, Yutaka.,Tanaka, Masayuki.,...&Wang, Shiang-Yu.(2016).A NEW MILKY WAY SATELLITE DISCOVERED IN THE SUBARU/HYPER SUPRIME-CAM SURVEY.ASTROPHYSICAL JOURNAL,832(1).
MLA	Homma, Daisuke,et al."A NEW MILKY WAY SATELLITE DISCOVERED IN THE SUBARU/HYPER SUPRIME-CAM SURVEY".ASTROPHYSICAL JOURNAL 832.1(2016).