THE QUENCHING OF THE ULTRA-FAINT DWARF GALAXIES IN THE REIONIZATION ERA

被引：284

作者：

Brown, Thomas M. ^{[1
]}

Tumlinson, Jason ^{[1
]}

Geha, Marla ^{[2
]}

Simon, Joshua D. ^{[3
]}

Vargas, Luis C. ^{[2
]}

VandenBerg, Don A. ^{[4
]}

Kirby, Evan N. ^{[5
]}

Kalirai, Jason S. ^{[1
,6
]}

Avila, Roberto J. ^{[1
]}

Gennaro, Mario ^{[1
]}

Ferguson, Henry C. ^{[1
]}

Munoz, Ricardo R. ^{[7
]}

Guhathakurta, Puragra ^{[8
,9
]}

Renzini, Alvio ^{[10
]}

机构：

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

[2] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[3] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA

[4] Univ Victoria, Dept Phys & Astron, STN CSC, Victoria, BC V8W 2Y2, Canada

[5] CALTECH, Pasadena, CA 91125 USA

[6] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA

[7] Univ Chile, Dept Astron, Santiago, Chile

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

[9] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[10] Osserv Astron Padova, I-35122 Padua, Italy

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 796卷 / 02期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: photometry; galaxies: stellar content; Local Group; STAR-FORMATION HISTORY; MILKY-WAY SATELLITE; METAL-POOR STARS; DIGITAL SKY SURVEY; MULTIELEMENT ABUNDANCE MEASUREMENTS; GALACTIC GLOBULAR-CLUSTERS; COLOR-MAGNITUDE DIAGRAM; 1ST SPECTROSCOPIC DATA; URSA-MAJOR; SPHEROIDAL SATELLITE;

D O I：

10.1088/0004-637X/796/2/91

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our analysis employs a combination of high-precision photometry obtained with the Advanced Camera for Surveys on the Hubble Space Telescope, medium-resolution spectroscopy obtained with the DEep Imaging Multi-Object Spectrograph on the W. M. Keck Observatory, and updated Victoria-Regina isochrones tailored to the abundance patterns appropriate for these galaxies. The data for five of these Milky Way satellites are best fit by a star formation history where at least 75% of the stars formed by z similar to 10 (13.3 Gyr ago). All of the galaxies are consistent with 80% of the stars forming by z similar to 6 (12.8 Gyr ago) and 100% of the stars forming by z similar to 3 (11.6 Gyr ago). The similarly ancient populations of these galaxies support the hypothesis that star formation in the smallest dark-matter sub-halos was suppressed by a global outside influence, such as the reionization of the universe.

引用

页数：13

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