Andromeda IX:: A new dwarf spheroidal satellite of M31

被引：85

作者：

Zucker, DB

Kniazev, AY

Bell, EF

Martínez-Delgado, D

Grebel, EK

Rix, HW

Rockosi, CM

Holtzman, JA

Walterbos, RAM

Annis, J

York, DG

Ivezic, Z

Brinkmann, J

Brewington, H

Harvanek, M

Hennessy, G

Kleinman, SJ

Krzesinski, J

Long, D

Newman, PR

Nitta, A

Snedden, SA

机构：

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

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

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

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

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

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

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

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

[9] USN Observ, Washington, DC 20392 USA

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 612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 : evolution; galaxies : individual (Andromeda V; andromeda IX); Local Group;

D O I：

10.1086/424691

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a new dwarf spheroidal satellite of M31, Andromeda IX, based on resolved stellar photometry from the Sloan Digital Sky Survey (SDSS). Using both SDSS and public archival data, we have estimated its distance and other physical properties, and compared these to the properties of a previously known dwarf spheroidal companion, Andromeda V, also observed by SDSS. Andromeda IX is the lowest surface brightness galaxy found to date (mu(V,0) similar to 26.8 mag arcsec(-2)), and at the distance we estimate from the position of the tip of Andromeda IX's red giant branch, (m - M)(0) similar to 24.5 (805 kpc), Andromeda IX would also be the faintest galaxy known (M-V similar to - 8.3).

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收藏

页码：L121 / L124

页数：4

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