LEO V: A COMPANION OF A COMPANION OF THE MILKY WAY GALAXY?

被引：133

作者：

Belokurov, V. ^{[1
]}

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

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

Faria, D. C. ^{[1
]}

Gilmore, G. ^{[1
]}

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

Koposov, S. ^{[2
]}

Mateo, M. ^{[3
]}

Olszewski, E. ^{[4
]}

Zucker, D. B. ^{[1
]}

机构：

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

[2] Max Planck Inst Astron, D-69117 Heidelberg, Germany

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

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 686卷 / 02期

基金：

美国国家科学基金会; 英国科学技术设施理事会; 美国国家航空航天局;

关键词：

galaxies: dwarf; galaxies: individual (Leo); Local Group;

D O I：

10.1086/592962

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a new Milky Way satellite in the constellation Leo, identified in data from the Sloan Digital Sky Survey. It lies at a distance of similar to 180 kpc, and is separated by less than or similar to 3 degrees from another recent discovery, Leo IV. We present follow-up imaging from the Isaac Newton Telescope and spectroscopy from the Hectochelle fiber spectrograph at the Multiple Mirror Telescope. Leo V's heliocentric velocity is similar to 173.3 +/- 3.1 km s(-1), offset by similar to 40 km s(-1) from that of Leo IV. A simple interpretation of the kinematic data is that both objects may lie on the same stream, although the implied orbit is only modestly eccentric (e similar to 0.2)

引用

页码：L83 / L86

页数：4

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