Discovery of a cold stellar stream in the ATLAS DR1 data

被引：66

作者：

Koposov, S. E. ^{[1
,2
]}

Irwin, M. ^{[1
]}

Belokurov, V. ^{[1
]}

Gonzalez-Solares, E. ^{[1
]}

Yoldas, A. Kupcu ^{[1
]}

Lewis, J. ^{[1
]}

Metcalfe, N. ^{[3
]}

Shanks, T. ^{[3
]}

机构：

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

[2] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia

[3] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 442卷 / 01期

基金：

欧洲研究理事会;

关键词：

Galaxy: fundamental parameters; Galaxy: halo; Galaxy: kinematics and dynamics; H-ALPHA SURVEY; TIDAL TAILS; GLOBULAR-CLUSTERS; GALACTIC PLANE; CLUMPY STREAMS; DWARF GALAXY; SAGITTARIUS; HALO;

D O I：

10.1093/mnrasl/slu060

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a narrow stellar stream crossing the constellations of Sculptor and Fornax in the Southern celestial hemisphere. The portion of the stream detected in the Data Release 1 photometry of the ATLAS survey is at least 12. long, while its width is approximate to 0 degrees.25. The colour-magnitude diagram of this halo sub-structure is consistent with a metal-poor [Fe/H] less than or similar to -1.4 stellar population located at a heliocentric distance of 20 +/- 2 kpc. There are three globular clusters that could tentatively be associated with the stream: NGC 7006, NGC 7078 (M15) and Pyxis, but NGC 7006 and 7078 seem to have proper motions incompatible with the stream orbit.

引用

页码：L85 / L89

页数：5

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