Local Group ultra-faint dwarf galaxies in the reionization era

被引：47

作者：

Weisz, Daniel R. ^{[1
]}

Boylan-Kolchin, Michael ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[2] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 469卷 / 01期

基金：

美国国家科学基金会;

关键词：

Hertzsprung-Russell and colour-magnitude; galaxies: dwarf; galaxies: high-redshift; Local Group; galaxies: luminosity function; mass function; early Universe; MILKY-WAY SATELLITES; UV LUMINOSITY FUNCTIONS; STAR-FORMATION HISTORY; HIGH-REDSHIFT GALAXIES; INITIAL MASS FUNCTION; GAMMA-RAY BURSTS; COSMIC REIONIZATION; EVOLUTION; UNIVERSE; END;

D O I：

10.1093/mnrasl/slx043

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Motivated by the stellar fossil record of Local Group (LG) dwarf galaxies, we show that the star-forming ancestors of the faintest ultra-faint dwarf galaxies (UFDs; M-V similar to -2 or M-star similar to 10(2) at z = 0) had ultraviolet (UV) luminosities of M-UV similar to -3 to -6 during reionization (z similar to 6-10). The existence of such faint galaxies has substantial implications for early epochs of galaxy formation and reionization. If the faint-end slopes of the UV luminosity functions (UVLFs) during reionization are steep (alpha less than or similar to -2) to M-UV similar to -3, then (i) the ancestors of UFDs produced > 50 per cent of UV flux from galaxies; (ii) galaxies can maintain reionization with escape fractions that are more than two times lower than currently adopted values; (iii) direct Hubble Space Telescope and JamesWebb Space Telescope observations may detect only similar to 10-50 per cent of the UV light from galaxies; and (iv) the cosmic star formation history increases by greater than or similar to 4-6 at z greater than or similar to 6. Significant flux from UFDs, and resultant tensions with LG dwarf galaxy counts, is reduced if the high-redshift UVLF turns over. Independent of the UVLF shape, the existence of a large population of UFDs requires a non-zero luminosity function to M-UV similar to -3 during reionization.

引用

页码：L83 / L88

页数：6

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