The suppression of star formation on the smallest scales: what role does environment play?
The suppression of star formation on the smallest scales: what role does environment play?
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在最小尺度上抑制恒星形成：环境起什么作用？
DOI：
10.1093/mnras/sty3357
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发表时间：
2018
影响因子：
4.8
通讯作者：
Garrison-Kimmel, S
中科院分区：
文献类型：
--
作者：
Rodriguez Wimberly, M K;Cooper, M C;Fillingham, S P;Boylan-Kolchin, M;Bullock, J S;Garrison-Kimmel, S
在质量最低的星系（即超微弱矮星）中观察到的主要是古老的恒星群体表明，它们的恒星形成受到再电离的抑制。然而，大多数经过充分研究的超微弱矮星都位于银河系暗物质晕的中半部，因此它们与早期积累的种群一致，因此可能会通过环境过程而熄灭。为了研究环境在最小尺度上抑制恒星形成的潜在作用，我们利用 N 体模拟中的探索局部体积模拟套件来限制可能容纳超微弱种群的低质量次晕的坠落时间分布。对于通过哈勃太空望远镜成像推断出恒星形成历史的银河系超微弱卫星，我们发现环境不太可能在抑制其恒星形成方面发挥主导作用。即使考虑到预处理的潜在影响，环境过程也有可能足够早地熄灭所有已知的超微弱矮星，足以解释它们观测到的恒星形成历史。相反，我们主张卫星淬火有效性的质量下限大致为，低于该质量下限，幸存星系中的恒星形成在整体上受到再电离的抑制。我们预测局地场中存在大量猝灭超微弱矮星 (1 <R/Rvir< 2)，未来的广域成像巡天将发现多达 ∼250 个。
The predominantly ancient stellar populations observed in the lowest mass galaxies (i.e. ultra-faint dwarfs) suggest that their star formation was suppressed by reionization. Most of the well-studied ultra-faint dwarfs, however, are within the central half of the Milky Way dark matter halo, such that they are consistent with a population that was accreted at early times and thus potentially quenched via environmental processes. To study the potential role of environment in suppressing star formation on the smallest scales, we utilize the Exploring the Local Volume in Simulations suite ofN-body simulations to constrain the distribution of infall times for low-mass subhaloes likely to host the ultra-faint population. For the ultra-faint satellites of the Milky Way with star formation histories inferred fromHubble Space Telescopeimaging, we find that environment is highly unlikely to play a dominant role in quenching their star formation. Even when including the potential effects of pre-processing, there is aprobability that environmental processes quenched all of the known ultra-faint dwarfs early enough to explain their observed star formation histories. Instead, we argue for a mass floor in the effectiveness of satellite quenching at roughly, below which star formation in surviving galaxies is globally suppressed by reionization. We predict a large population of quenched ultra-faint dwarfs in the Local Field (1 <R/Rvir< 2), with as many as ∼250 to be discovered by future wide-field imaging surveys.
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波江座 II 及其孤星团的深度成像
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
D. Crnojević;D. Sand;D. Zaritsky;K. Spekkens;B. Willman;J. R. D. O. Physics;Texas Tech University;Lubbock;Tx;Usa;S. Observatory;U. Arizona;Tucson;Az;Royal Military College of Canada;D. O. Physics;Kingston;On;Canada;Lsst;H. College;D. O. Physics;Astronomy;Haverford;Pa;S. S. Institute;Baltimore;Md
通讯作者：
Md
由于当地邻居的再电离而导致低质量星系中恒星形成的抑制
影响因子：
4.8
作者：
Taha Dawoodbhoy;P. Shapiro;P. Ocvirk;D. Aubert;N. Gillet;Jun;I. Iliev;R. Teyssier;G. Yepes;S. Gottlober;Anson D’Aloisio;Hyunbae Park;Y. Hoffman
通讯作者：
Y. Hoffman
哈勃太空望远镜成像中的 LEO T 恒星形成历史
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
D. Weisz;D. Zucker;A. Dolphin;N. Martin;J. D. de Jong;J. Holtzman;J. Dalcanton;K. Gilbert;B. Williams;E. Bell;V. Belokurov;N. Evans
通讯作者：
N. Evans
影响因子：
4.8
作者：
M. Hirschmann;G. Lucia;D. Wilman;Simone M. Weinmann;A. Iovino;O. Cucciati;S. Zibetti;'Alvaro Villalobos
通讯作者：
M. Hirschmann;G. Lucia;D. Wilman;Simone M. Weinmann;A. Iovino;O. Cucciati;S. Zibetti;'Alvaro Villalobos
DOI：
10.1088/0004-637x/786/1/74
发表时间：
2014-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Frebel;J. Simon;E. Kirby
通讯作者：
A. Frebel;J. Simon;E. Kirby