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- W4308917749 abstract "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 HI scale height in 22 non-interacting Milky Way-mass galaxies from the FIREbox cosmological volume. We measure the HI scale 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 $gtrsim$60 per cent of the HI mass. We find median HI scale 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 HI scale heights." @default.
- W4308917749 created "2022-11-19" @default.
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- W4308917749 date "2022-11-09" @default.
- W4308917749 modified "2023-10-15" @default.
- W4308917749 title "Realistic H <scp>i</scp> scale heights of Milky Way-mass galaxies in the FIREbox cosmological volume" @default.
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- W4308917749 doi "https://doi.org/10.1093/mnrasl/slac138" @default.
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