The field of streams: Sagittarius and its siblings

被引：745

作者：

Belokurov, V.

Zucker, D. B.

Evans, N. W.

Gilmore, G.

Vidrih, S.

Bramich, D. M.

Newberg, H. J.

Wyse, R. F. G.

Irwin, M. J.

Fellhauer, M.

Hewett, P. C.

Walton, N. A.

Wilkinson, M. I.

Cole, N.

Yanny, B.

Rockosi, C. M.

Beers, T. C.

Bell, E. F.

Brinkmann, J.

Ivezic, Z. .

Lupton, R.

机构：

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

[2] Rensselaer Polytech Inst, Dept Phys & Astron, Troy, NY 12180 USA

[3] Johns Hopkins Univ, Baltimore, MD 21218 USA

[4] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[5] Univ Calif Santa Cruz, Lick Observ, Santa Cruz, CA 95064 USA

[6] Michigan State Univ, Dept Phys & Astron, Ctr Study Cosm Evolut, E Lansing, MI 48824 USA

[7] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA

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

[9] Apache Point Observ, Sunspot, NM 88349 USA

[10] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[11] Princeton Univ Observ, Princeton, NJ 08544 USA

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 642卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

galaxies : individual (Sagittarius dSph); galaxies : kinematics and dynamics; galaxies : structure; Galaxy : halo; Local Group;

D O I：

10.1086/504797

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) u, g, r, i, z photometry to study Milky Way halo substructure in the area around the north Galactic cap. A simple color cut (g - r < 0.4) reveals the tidal stream of the Sagittarius dwarf spheroidal galaxy, as well as a number of other stellar structures in the field. Two branches ( A and B) of the Sagittarius stream are clearly visible in an RGB composite image created from three magnitude slices, and there is also evidence for a still more distant wrap behind the A branch. A comparison of these data with numerical models suggests that the shape of the Galactic dark halo is close to spherical.

引用

页码：L137 / L140

页数：4

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