Andromeda X, a new dwarf spheroidal satellite of M31:: Photometry

被引：88

作者：

Zucker, Daniel B.

Kniazev, Alexei Y.

Martinez-Delgado, David

Bell, Eric F.

Rix, Hans-Walter

Grebel, Eva K.

Holtzman, Jon A.

Walterbos, Rene A. M.

Rockosi, Constance M.

York, Donald G.

Barentine, J. C.

Brewington, Howard

Brinkmann, J.

Harvanek, Michael

Kleinman, S. J.

Krzesinski, Jurek

Long, Dan

Neilsen, Eric H., Jr.

Nitta, Atsuko

Snedden, Stephanie A.

机构：

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

[2] S African Astron Observ, ZA-7935 Cape Town, South Africa

[3] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain

[4] Univ Basel, Astron Inst, CH-4102 Binningen, Switzerland

[5] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA

[6] UCO, Lick Observ, Santa Cruz, CA 95064 USA

[7] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

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

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

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

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 659卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

galaxies : dwarf; galaxies : evolution; galaxies : individual (Andromeda IX; Andromeda X); local group;

D O I：

10.1086/516748

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of Andromeda X, a new dwarf spheroidal satellite of M31, based on stellar photometry from the Sloan Digital Sky Survey. Using follow-up imaging data we have estimated its distance and other physical properties. We find that Andromeda X has a dereddened central surface brightness mu(V,0) similar to 26.7 mag arcsec(-2) and a total apparent magnitude of V-tot similar to 16.1 which at the derived distance modulus, (m - M)(0) similar to 24.12-24.34, yields an absolute magnitude of M-V similar to -8.1 +/- 0.5; these values are quite comparable to those of Andromeda IX, a previously discovered low-luminosity M31 satellite. The discoveries of Andromeda X and of numerous other extremely faint satellites around M31 and the Milky Way in the past few years suggest that such objects may be plentiful in the Local Group.

引用

页码：L21 / L24

页数：4

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