论文标题
HESTIA模拟中的乳乳路M31系统周围的冷和热气体分布
Cold and Hot gas distribution around the Milky-Way-M31 system in the HESTIA simulations
论文作者
论文摘要
最近的观察结果表明，在星系光环的圆形培养基（CGM）中对气体储层有了显着的见解。在本文中，我们表征了银河系附近的气体和hestia（直接区域的高分辨率环境模拟）套件的含量约束局部组（LG）模拟中的气体。 Hestia Suite包括一组基于Auriga Galaxy形成模型的LG的三个高分辨率{\ sc arepo}基于LG的模拟。在本文中，我们仅关注$ z = 0 $仿真数据集，并生成模拟的Skymaps以及功率谱分析，以表明追踪低温气体（HI和SIIII）的离子的分布与温暖的气体望远镜（OVI，OVI，OVII和OVIII）相比更加团块。我们与M31和低红移星系的光谱CGM观测值进行了比较。 Hestia生产不足的M31观测值的色谱柱密度，但模拟与低红移星系的观测值一致。这些发现的一个可能的解释是，M31的光谱观察结果被驻留在银河系中的CGM中的气体污染。
Recent observations have revealed remarkable insights into the gas reservoir in the circumgalactic medium (CGM) of galaxy haloes. In this paper, we characterise the gas in the vicinity of Milky Way and Andromeda analogues in the HESTIA (High resolution Environmental Simulations of The Immediate Area) suite of constrained Local Group (LG) simulations. The HESTIA suite comprise of a set of three high-resolution {\sc arepo}-based simulations of the LG, run using the Auriga galaxy formation model. For this paper, we focus only on the $z = 0$ simulation datasets and generate mock skymaps along with a power spectrum analysis to show that the distributions of ions tracing low-temperature gas (HI and SiIII) are more clumpy in comparison to warmer gas tracers (OVI, OVII and OVIII). We compare to the spectroscopic CGM observations of M31 and low-redshift galaxies. HESTIA under-produces the column densities of the M31 observations, but the simulations are consistent with the observations of low-redshift galaxies. A possible explanation for these findings is that the spectroscopic observations of M31 are contaminated by gas residing in the CGM of the Milky Way.
