Extinguishing the FIRE: environmental quenching of satellite galaxies around Milky Way-mass hosts in simulations
Extinguishing the FIRE: environmental quenching of satellite galaxies around Milky Way-mass hosts in simulations
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灭火：模拟中银河系质量宿主周围卫星星系的环境淬灭
DOI：
10.1093/mnras/stac1706
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发表时间：
2022
影响因子：
4.8
通讯作者：
Pardasani, Bhavya
中科院分区：
文献类型：
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作者：
Samuel, Jenna;Wetzel, Andrew;Santistevan, Isaiah;Tollerud, Erik;Moreno, Jorge;Boylan-Kolchin, Michael;Bailin, Jeremy;Pardasani, Bhavya
银河系（MW）和仙女座星系（M31）周围的卫星星系的星星形成和气体含量相对于本星系群（LG）中更孤立的星系在固定的恒星质量下是耗尽的。我们通过FIRE-2模拟研究了z = 0星系中14 MW质量附近星系的气体含量和星星形成的猝灭。低质量卫星（）大多处于静止状态，高质量卫星（）大多处于星星形成状态，中等质量卫星（）在静止状态和星星形成状态之间大致相等。在环银河系介质中含有更多气体的星系，其大质量卫星的静止比例更高（）。我们发现没有显着的依赖于孤立与配对（LG样）主机环境，和周围MW质量和大麦哲伦云（LMC）质量主机从FIRE-2模拟卫星的静止分数是非常相似的。导致淬灭的环境效应也可能发生在MW下降之前的低质量组的预处理中。较低质量的卫星通常在MW级星系进入中心星系之前就熄灭了，或者在进入低质量星系群或MW级星系的过程中迅速熄灭。大多数中等质量到高质量的静止卫星在MW质量晕内经历了≥1-2次近心点通道（2.5-5 Gyr）。大多数星系在落入宿主之前并没有熄灭，这表明孤立熄灭可能存在一个质量上限。模拟再现的平均趋势，在LG静止分数在整个范围内的卫星恒星质量。虽然模拟结果与佐贺调查的静止分数一致，但它们通常不会重现佐贺在较低质量下的营业额。
The star formation and gas content of satellite galaxies around the Milky Way (MW) and Andromeda (M31) are depleted relative to more isolated galaxies in the Local Group (LG) at fixed stellar mass. We explore the environmental regulation of gas content and quenching of star formation inz= 0 galaxies ataround 14 MW-mass hosts from the Feedback In Realistic Environments 2 (FIRE-2) simulations. Lower mass satellites () are mostly quiescent and higher mass satellites () are mostly star forming, with intermediate-mass satellites () split roughly equally between quiescent and star forming. Hosts with more gas in their circumgalactic medium have a higher quiescent fraction of massive satellites (). We find no significant dependence on isolated versus paired (LG-like) host environments, and the quiescent fractions of satellites around MW-mass and Large Magellanic Cloud (LMC)-mass hosts from the FIRE-2 simulations are remarkably similar. Environmental effects that lead to quenching can also occur as pre-processing in low-mass groups prior to MW infall. Lower mass satellites typically quenched before MW infall as central galaxies or rapidly during infall into a low-mass group or a MW-mass galaxy. Most intermediate- to high-mass quiescent satellites have experienced ≥1–2 pericentre passages (≈2.5–5 Gyr) within a MW-mass halo. Most galaxies withdid not quench before falling into a host, indicating a possible upper mass limit for isolated quenching. The simulations reproduce the average trend in the LG quiescent fraction across the full range of satellite stellar masses. Though the simulations are consistent with the Satellites Around Galactic Analogs (SAGA) survey’s quiescent fraction at, they do not generally reproduce SAGA’s turnover at lower masses.
GizmoAnalysis：阅读和分析 Gizmo 模拟
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
A. Wetzel;S. Garrison
通讯作者：
S. Garrison
HaloAnalysis：读取和分析 halo 目录和合并树
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
A. Wetzel;S. Garrison
通讯作者：
S. Garrison