BIG FISH, LITTLE FISH: TWO NEW ULTRA-FAINT SATELLITES OF THE MILKY WAY

被引：168

作者：

Belokurov, V. ^{[1
]}

Walker, M. G. ^{[1
]}

Evans, N. W. ^{[1
]}

Gilmore, G. ^{[1
]}

Irwin, M. J. ^{[1
]}

Just, D. ^{[2
]}

Koposov, S. ^{[1
]}

Mateo, M. ^{[3
]}

Olszewski, E. ^{[2
]}

Watkins, L. ^{[1
]}

Wyrzykowski, L. ^{[1
]}

机构：

[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 712卷 / 01期

基金：

美国国家航空航天局; 英国科学技术设施理事会; 美国国家科学基金会;

关键词：

galaxies: dwarf; galaxies:; individual; (Pisces; Pegasus); Local Group; GLOBULAR-CLUSTERS; URSA-MAJOR; SEGUE; DISCOVERY; BOOTES; GALAXY;

D O I：

10.1088/2041-8205/712/1/L103

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of similar to 180 kpc, some 15 degrees away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of similar to 60 pc, while Segue 3 is 20 times smaller at only 3 pc.

引用

页码：L103 / L106

页数：4

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