Realistic H i scale heights of Milky Way-mass galaxies in the FIREbox cosmological volume
Realistic H i scale heights of Milky Way-mass galaxies in the FIREbox cosmological volume
复制标题
FIREbox 宇宙体积中真实的 H 尺度高度的银河系质量星系
DOI：
10.1093/mnrasl/slac138
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发表时间：
2022
影响因子：
--
通讯作者：
Faucher-Giguère, Claude-André
中科院分区：
文献类型：
--
作者：
Gensior, Jindra;Feldmann, Robert;Mayer, Lucio;Wetzel, Andrew;Hopkins, Philip F.;Faucher-Giguère, Claude-André
Accurately reproducing the thin cold gas discs observed in nearby spiral galaxies has been a long standing issue in cosmological simulations. Here, we present measurements of the radially resolved Hiscale height in 22 non-interacting Milky Way-mass galaxies from the FIREbox cosmological volume. We measure the Hiscale heights using five different approaches commonly used in the literature: fitting the vertical volume density distribution with a Gaussian, the distance between maximum and half-maximum of the vertical volume density distribution, a semi-empirical description using the velocity dispersion and the galactic gravitational potential, the analytic assumption of hydrostatic equilibrium, and the distance from the midplane which encloses ≳60 per cent of the Himass. We find median Hiscale heights, measured using the vertical volume distribution, that range from ∼100 pc in the galactic centres to ∼800 pc in the outskirts and are in excellent agreement with recent observational results. We speculate that the presence of a realistic multiphase interstellar medium, including cold gas, and realistic stellar feedback are the drivers behind the realistic Hiscale heights.
