A faint new milky way satellite in Bootes

被引：340

作者：

Belokurov, V.

Zucker, D. B.

Evans, N. W.

Wilkinson, M. I.

Irwin, M. J.

Hodgkin, S.

Bramich, D. M.

Irwin, J. M.

Gilmore, G.

Willman, B.

Vidrih, S.

Newberg, H. J.

Wyse, R. F. G.

Fellhauer, M.

Hewett, P. C.

Cole, N.

Bell, E. F.

Beers, T. C.

Rockosi, C. M.

Yanny, B.

Grebel, E. K.

Schneider, D. P.

Lupton, R.

Barentine, J. C.

Brewington, H.

Brinkmann, J.

Harvanek, M.

Kleinman, S. J.

Krzesinski, J.

Long, D.

Nitta, A.

Smith, J. A.

Snedden, S. A.

机构：

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

[2] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[3] Rensselaer Polytech Inst, Troy, NY 12180 USA

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

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

[6] Michigan State Univ, Dept Phys & Astron, CSCE, E Lansing, MI 48824 USA

[7] Michigan State Univ, JINA, E Lansing, MI 48824 USA

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

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

[10] Univ Basel, Astron Inst, Dept Phys & Astron, CH-4102 Binningen, Switzerland

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

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

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

[14] Kracow Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland

[15] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 647卷 / 02期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

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

D O I：

10.1086/507324

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of similar to 60 kpc. It was found in a systematic search for stellar overdensities in the north Galactic cap using Sloan Digital Sky Survey Data Release 5. The color-magnitude diagram shows a well-defined turnoff, red giant branch, and extended horizontal branch. Its absolute magnitude is M-V similar to -5.8 mag, which makes it one of the faintest galaxies known. The half-light radius is similar to 220 pc. The isodensity contours are elongated and have an irregular shape, suggesting that Boo may be a disrupted dwarf spheroidal galaxy.

引用

页码：L111 / L114

页数：4

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