COMPARING M31 AND MILKY WAY SATELLITES: THE EXTENDED STAR FORMATION HISTORIES OF ANDROMEDA II AND ANDROMEDA XVI

被引：33

作者：

Weisz, Daniel R. ^{[1
,2
]}

Skillman, Evan D. ^{[3
]}

Hidalgo, Sebastian L. ^{[4
,5
]}

Monelli, Matteo ^{[4
,5
]}

Dolphin, Andrew E. ^{[6
]}

McConnachie, Alan ^{[7
]}

Bernard, Edouard J. ^{[8
]}

Gallart, Carme ^{[4
,5
]}

Aparicio, Antonio ^{[4
,5
]}

Boylan-Kolchin, Michael ^{[9
]}

Cassisi, Santi ^{[10
]}

Cole, Andrew A. ^{[11
]}

Ferguson, Henry C. ^{[12
]}

Irwin, Mike ^{[13
]}

Martin, Nicolas F. ^{[14
,15
]}

Mayer, Lucio ^{[16
,17
]}

McQuinn, Kristen B. W. ^{[3
]}

Navarro, Julio F. ^{[18
]}

Stetson, Peter B. ^{[7
]}

机构：

[1] Univ Calif Santa Cruz, Dept Astron, Santa Cruz, CA 95064 USA

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

[3] Univ Minnesota, Minnesota Inst Astrophys, Minneapolis, MN USA

[4] Inst Astrofis Canarias, E-38200 Tenerife, Canary Islands, Spain

[5] Univ La Laguna, Dept Astrophys, E-38200 Tenerife, Canary Islands, Spain

[6] Raytheon Co, Tucson, AZ 85706 USA

[7] Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada

[8] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[9] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[10] INAF Osservatorio Astron Collurania, Teramo, Italy

[11] Univ Tasmania, Sch Math & Phys, Hobart, Tas, Australia

[12] Space Telescope Sci Inst, Baltimore, MD 21218 USA

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

[14] Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, F-67000 Strasbourg, France

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

[16] Univ Zurich, Inst Theoret Phys, CH-8001 Zurich, Switzerland

[17] Swiss Fed Inst Technol, Inst Astron, Dept Phys, Zurich, Switzerland

[18] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 789卷 / 01期

关键词：

galaxies: dwarf; galaxies: individual (And II; And XVI); Galaxy: evolution; Galaxy: formation; Local Group; DWARF SPHEROIDAL COMPANIONS; WFPC2; OBSERVATIONS; GALAXIES; REIONIZATION; KINEMATICS; ABUNDANCES; EVOLUTION; DISK; HALO; UNCERTAINTIES;

D O I：

10.1088/0004-637X/789/1/24

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first comparison between the lifetime star formation histories (SFHs) of M31 and Milky Way (MW) satellites. Using the Advanced Camera for Surveys on board the Hubble Space Telescope, we obtained deep optical imaging of Andromeda II (And II; M-V = -12.0; log(M-star/M-circle dot) similar to 6.7) and Andromeda XVI (And XVI; M-V = -7.5; log(M-star/M-circle dot) similar to 4.9) yielding color-magnitude diagrams that extend at least 1 mag below the oldest main-sequence turnoff, and are similar in quality to those available for the MW companions. And II and And XVI show strikingly similar SFHs: both formed 50%-70% of their total stellar mass between 12.5 and 5 Gyr ago (z similar to 5-0.5) and both were abruptly quenched similar to 5 Gyr ago (z similar to 0.5). The predominance of intermediate age populations in And XVI makes it qualitatively different from faint companions of the MW and clearly not a pre-reionization fossil. Neither And II nor And XVI appears to have a clear analog among MW companions, and the degree of similarity in the SFHs of And II and And XVI is not seen among comparably faint-luminous pairs of MW satellites. These findings provide hints that satellite galaxy evolution may vary substantially among hosts of similar stellar mass. Although comparably deep observations of more M31 satellites are needed to further explore this hypothesis, our results underline the need for caution when interpreting satellite galaxies of an individual system in a broader cosmological context.

引用

页数：6

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