The fates of the circumgalactic medium in the FIRE simulations
The fates of the circumgalactic medium in the FIRE simulations
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FIRE 模拟中环绕银河系介质的命运
DOI：
10.1093/mnras/staa902
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发表时间：
2020
影响因子：
4.8
通讯作者：
Murray, Norman
中科院分区：
文献类型：
--
作者：
Hafen, Zachary;Faucher-Giguère, Claude-André;Anglés-Alcázar, Daniel;Stern, Jonathan;Kereš, Dušan;Esmerian, Clarke;Wetzel, Andrew;El-Badry, Kareem;Chan, T K;Murray, Norman
We analyse the different fates of the circumgalactic medium (CGM) in FIRE-2 cosmological simulations, focusing on the redshiftsz= 0.25 and 2 representative of recent surveys. Our analysis includes 21 zoom-in simulations covering the halo mass range. We analyse both where the gas ends up after first leaving the CGM (its ‘proximate’ fate) and its location atz= 0 (its ‘ultimate’ fate). Of the CGM atz= 2, about half is found in the ISM or stars of the central galaxy byz= 0 inMh(z= 2) ∼ 5 × 1011M⊙haloes, but most of the CGM in lower mass haloes ends up in the intergalactic medium (IGM). This is so even though most of the CGM inMh(z= 2) ∼ 5 × 1010M⊙haloes first accretes on to the central galaxy before being ejected into the IGM. On the other hand, most of the CGM mass atz= 0.25 remains in the CGM byz= 0 at all halo masses analysed. Of the CGM gas that subsequently accretes on to the central galaxy in the progenitors ofMh(z= 0) ∼ 1012M⊙haloes, most of it is cool (T∼ 104K) atz= 2 but hot (∼Tvir) atz∼ 0.25, consistent with the expected transition from cold mode to hot mode accretion. Despite the transition in accretion mode, at bothz= 0.25 andof the cool gas inhaloes will accrete on to a galaxy. We find that the metallicity of CGM gas is typically a poor predictor of both its proximate and ultimate fates. This is because there is in general little correlation between the origin of CGM gas and its fate owing to substantial mixing while in the CGM.
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DOI：
10.3847/1538-4357/aac884
发表时间：
2018-03
期刊：
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