The imprint of reionization on the star formation histories of dwarf galaxies

被引：62

作者：

Benitez-Llambay, A. ^{[1
,2
]}

Navarro, J. F. ^{[3
]}

Abadi, M. G. ^{[1
,2
]}

Gottloeber, S. ^{[4
]}

Yepes, G. ^{[5
]}

Hoffman, Y. ^{[6
]}

Steinmetz, M. ^{[4
]}

机构：

[1] Univ Nacl Cordoba, Observ Astron, Cordoba, Argentina

[2] Consejo Nacl Invest Cient & Tecn, Inst Astron Teorica & Expt, Cordoba, Argentina

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

[4] Leibniz Inst Astrophys, D-14482 Potsdam, Germany

[5] Univ Autonoma Madrid, Dept Fis & Teor, E-28049 Madrid, Spain

[6] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 450卷 / 04期

基金：

美国国家科学基金会; 以色列科学基金会;

关键词：

galaxies: dwarf; galaxies: evolution; galaxies: formation; Local Group; galaxies: stellar content; dark ages; reionization; first stars; HUBBLE-SPACE-TELESCOPE; PROBE WMAP OBSERVATIONS; DARK-MATTER; LOCAL GROUP; COLUMN DENSITY; HYDRODYNAMIC SIMULATIONS; SPHEROIDAL GALAXY; LEO T; MASS; PHOTOIONIZATION;

D O I：

10.1093/mnras/stv925

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use a compilation of star formation histories (SFHs) and cosmological simulations to explore the impact of cosmic reionization on nearby isolated dwarf galaxies. Nearby dwarfs show a wide diversity of SFHs; from ancient systems that completed their star formation (SF) similar to 10 Gyr ago to young dwarfs that formed the majority of their stars in the past similar to 5 Gyr to 'two-component' systems characterized by the overlap of old and young stars. As an ensemble, SF in nearby dwarfs dips to lower-than-average rates at intermediate times (4 < t/Gyr < 8), a feature caused in the simulation by cosmic reionization. Reionization heats the gas and drives it out of low-mass haloes, affecting especially systems with virial temperatures of similar to 2 x 10(4) K at z(reion). SF begins before z(reion) in systems above this threshold; its associated feedback compounds the effects of reionization, emptying the haloes of gas and leaving behind old stellar systems. In haloes below the threshold at z(reion), reionization leads to a delay in the onset of SF that lasts until the halo grows massive enough to allow gas to cool and form stars, leading to a system with a prominent young stellar component. 'Two-component' systems may be traced to late accretion events that allow young stars to form in systems slightly above the threshold at z(reion). The dearth of intermediate-age stars in nearby dwarfs might be the clearest signature of the imprint of cosmic reionization on the SFHs of dwarf galaxies.

引用

页码：4207 / 4220

页数：14

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