A new Milky Way dwarf satellite in Canes Venatici

被引：317

作者：

Zucker, D. B.

Belokurov, V.

Evans, N. W.

Wilkinson, M. I.

Irwin, M. J.

Sivarani, T.

Hodgkin, S.

Bramich, D. M.

Irwin, J. M.

Gilmore, G.

Willman, B.

Vidrih, S.

Fellhauer, M.

Hewett, P. C.

Beers, T. C.

Bell, E. F.

Grebel, E. K.

Schneider, D. P.

Newberg, H. J.

Wyse, R. F. G.

Rockosi, C. M.

Yanny, B.

Lupton, R.

Smith, J. A.

Barentine, J. C.

Brewington, H.

Brinkmann, J.

Harvanek, M.

Kleinman, S. J.

Krzesinski, J.

Long, D.

Nitta, A.

Snedden, S. A.

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[15] Cracow Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 643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 : dwarf; galaxies : individual (Canes Venatici); Local Group;

D O I：

10.1086/505216

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the north Galactic cap using Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The satellite's color-magnitude diagram shows a well-defined red giant branch as well as a horizontal branch. As judged from the tip of the red giant branch, it lies at a distance of similar to 220 kpc. Based on the SDSS data, we estimate an absolute magnitude of M-V similar to -7.9 a central surface brightness of mu(0,V) similar to 28 mag arcsec(-2), and a half-light radius of similar to 8.'5 (similar to 550 pc at the measured distance). The outer regions of Canes Venatici appear extended and distorted. The discovery of such a faint galaxy in proximity to the Milky Way strongly suggests that more such objects remain to be found.

引用

页码：L103 / L106

页数：4

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