THE SAGITTARIUS STREAMS IN THE SOUTHERN GALACTIC HEMISPHERE

被引：133

作者：

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

Belokurov, V. ^{[1
]}

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

Gilmore, G. ^{[1
]}

Gieles, M. ^{[1
]}

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

Lewis, G. F. ^{[1
,3
]}

Niederste-Ostholt, M. ^{[1
]}

Penarrubia, J. ^{[1
]}

Smith, M. C. ^{[4
,5
]}

Bizyaev, D. ^{[2
,6
]}

Malanushenko, E. ^{[6
]}

Malanushenko, V. ^{[6
]}

Schneider, D. P. ^{[7
]}

Wyse, R. F. G. ^{[8
]}

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 Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[4] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[5] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

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

[7] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 750卷 / 01期

基金：

澳大利亚研究理事会; 美国国家科学基金会;

关键词：

galaxies: dwarf; galaxies: individual (Sagittarius); Local Group; DIGITAL SKY SURVEY; MILKY-WAY TOMOGRAPHY; DWARF GALAXY; SURVEY VIEW; STARS; SDSS; HALO; SPECTROSCOPY; KINEMATICS; TELESCOPE;

D O I：

10.1088/0004-637X/750/1/80

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The structure of the Sagittarius stream in the southern Galactic hemisphere is analyzed with the Sloan Digital Sky Survey Data Release 8. Parallel to the Sagittarius tidal track, but similar to 10 degrees away, there is another fainter and more metal-poor stream. We provide evidence that the two streams follow similar distance gradients but have distinct morphological properties and stellar populations. The brighter stream is broader, contains more metal-rich stars, and has a richer color-magnitude diagram with multiple turnoffs and a prominent red clump as compared to the fainter stream. Based on the structural properties and the stellar population mix, the stream configuration is similar to the Northern "bifurcation." In the region of the South Galactic Cap, there is overlapping tidal debris from the Cetus stream, which crosses the Sagittarius stream. Using both photometric and spectroscopic data, we show that the blue straggler population belongs mainly to Sagittarius and the blue horizontal branch stars belong mainly to the Cetus stream in this confused location in the halo.

引用

页数：9

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