论文标题
Firebox宇宙学中的银河系质量星系的现实HI量表高度
Realistic HI scale heights of Milky Way-mass galaxies in the FIREbox cosmological volume
论文作者
论文摘要
准确地重现在附近螺旋星系中观察到的薄冷气盘，这是宇宙学模拟中长期存在的问题。在这里，我们介绍了来自Firebox宇宙学量的22个非相互作用的银河系星系中径向分辨的HI量表高度的测量值。我们使用文献中常用的五种不同方法来测量HI量表高度：将垂直量密度分布与高斯拟合，最大和最大垂直体积密度分布之间的距离，使用速度分散速度分散和银河系的速度重力的半经验描述，与水平平衡的距离，$ unibib $ unibib $ unibib $ us unibib $ us us的距离$ us us us usefim $ us us us in grom in grom in Mid grount $ us us us gulbibir $ us us us的距离。嗨，弥撒。我们发现使用垂直体积分布测量的中值HI量表高度，范围从银河中心的〜100 pc到郊区的〜800 pc，并且与最近的观察结果非常吻合。我们推测，现实的多相星际介质（包括冷气和现实的恒星反馈）的存在是现实的HI量表高度背后的驱动因素。
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.
