Galactic coronae in Milky Way-like galaxies: the role of stellar feedback in gas accretion
Galactic coronae in Milky Way-like galaxies: the role of stellar feedback in gas accretion
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类银河系中的银河冕：恒星反馈在气体吸积中的作用
DOI：
10.1093/mnras/stad2152
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发表时间：
2023
影响因子：
4.8
通讯作者：
Li, Hui
中科院分区：
文献类型：
--
作者：
Barbani, Filippo;Pascale, Raffaele;Marinacci, Federico;Sales, Laura V.;Vogelsberger, Mark;Torrey, Paul;Li, Hui
像银河系这样的恒星形成星系周围有一个维里温度的热气晕--也就是所谓的银河日冕--这在它们的演化过程中扮演着重要角色。盘面和日冕之间的相互作用已被证明对日冕气体在盘面上的吸积有直接影响，这对星系演化具有重大意义。在这项工作中，我们研究了像银河系这样的恒星形成星系的圆盘和日冕之间的气体循环。我们使用高分辨率流体动力学N体模拟类银河系，其中包含了观测驱动的银河系日冕。在此过程中，我们使用了SMUGGLE，一种显式星际介质(ISM)，和恒星反馈模型与移动网格代码区耦合。我们发现，银河系日冕中的气体储藏正在支持恒星的形成：从日冕中吸积的气体是形成新恒星的主要燃料，有助于维持银盘中几乎恒定的冷气体质量水平。恒星反馈通过喷射不同的气相，在圆盘和日冕(所谓的银河喷泉)之间产生气体循环，这些气相最终会重新吸积到圆盘上。日冕气体在盘状日冕界面与星系喷泉的混合促进了日冕气体的吸积，导致了中温气体的形成，从而加强了高温日冕的冷却。我们发现，这个过程起到了正反馈机制的作用，增加了日冕气体对银河系的吸积率。
Star-forming galaxies like the Milky Way are surrounded by a hot gaseous halo at the virial temperature – the so-called galactic corona – that plays a fundamental role in their evolution. The interaction between the disc and the corona has been shown to have a direct impact on accretion of coronal gas onto the disc with major implications for galaxy evolution. In this work, we study the gas circulation between the disc and the corona of star-forming galaxies like the Milky Way. We use high-resolution hydrodynamicalN-body simulations of a Milky Way-like galaxy with the inclusion of an observationally motivated galactic corona. In doing so, we useSMUGGLE, an explicit interstellar medium (ISM), and stellar feedback model coupled with the moving-mesh codearepo. We find that the reservoir of gas in the galactic corona is sustaining star formation: the gas accreted from the corona is the primary fuel for the formation of new stars, helping in maintaining a nearly constant level of cold gas mass in the galactic disc. Stellar feedback generates a gas circulation between the disc and the corona (the so-called galactic fountain) by ejecting different gas phases that are eventually re-accreted onto the disc. The accretion of coronal gas is promoted by its mixing with the galactic fountains at the disc–corona interface, causing the formation of intermediate temperature gas that enhances the cooling of the hot corona. We find that this process acts as a positive feedback mechanism, increasing the accretion rate of coronal gas onto the galaxy.
影响因子：
0.8
作者：
S. R.;N. Rt;S. Morse;James Seoates;J. H. Berg;R. Wiebe;J. A. Docka;H. Guest;Investigator;M. Coll;Patricia Lancaster;E. Schuh;Simmons;D. Lambert;C. Mines;K. M. Nolan;U. Mass;M. Pencak;N. Illinois
通讯作者：
S. R.;N. Rt;S. Morse;James Seoates;J. H. Berg;R. Wiebe;J. A. Docka;H. Guest;Investigator;M. Coll;Patricia Lancaster;E. Schuh;Simmons;D. Lambert;C. Mines;K. M. Nolan;U. Mass;M. Pencak;N. Illinois