GIMIC模拟中中性氢的环境依赖性
The environmental dependence of neutral hydrogen in the GIMIC simulations
摘要：
利用银河系-星系际介质相互作用计算（GIMIC）的宇宙流体动力学模拟方法，研究了z=0时模拟星系外围中性氢气体的分布及其与环境的关系.这种气体目前可以直接探测，例如，通过观察背景类星体的Ly $α$吸收。无线电设施，如平方公里阵列，将提供一个互补的探测弥漫HI的发射，并将限制物理基础的吸积和反馈机制之间的复杂的相互作用，影响星系际介质。我们提取了一个样本的488个星系的平均宇宙密度GIMIC区域的重新模拟。我们估计这些星系的中性氢含量和周围的星系际介质内，他们居住。我们调查的平均HI径向配置文件通过堆叠的个人配置文件，根据质量和环境。我们发现高HI柱密度在大碰撞参量的组环境和显着较低的HI密度的非组星系。我们认为，这些结果可能产生的冲压压力剥离和潮汐相互作用的组合效应存在于组环境。
英文摘要：
We use the Galaxies-Intergalactic Medium Interaction Calculation (GIMIC) cosmological hydrodynamic simulation at z=0 to study the distribution and environmental dependence of neutral hydrogen (HI) gas in the outskirts of simulated galaxies. This gas can currently be probed directly in, for example, Ly$α$ absorption via the observation of background quasars. Radio facilities, such as the Square Kilometre Array, will provide a complementary probe of the diffuse HI in emission and will constrain the physics underpinning the complex interplay between accretion and feedback mechanisms which affect the intergalactic medium. We extract a sample of 488 galaxies from a re-simulation of the average cosmic density GIMIC region. We estimate the neutral hydrogen content of these galaxies and the surrounding intergalactic medium within which they reside. We investigate the average HI radial profiles by stacking the individual profiles according to both mass and environment. We find high HI column densities at large impact parameters in group environments and markedly lower HI densities for non-group galaxies. We suggest that these results likely arise from the combined effects of ram pressure stripping and tidal interactions present in group environments.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
