Utilizing cosmological hydrodynamic simulations, we quantify the distributions of the dispersion measure (DM) of fast radio bursts (FRBs). We examine the contributions of cold, warm-hot, and hot gas to the total DM. We find that the hot gas component (T > 107K), on average, makes a minor contribution ($\le 5{{\ \rm per\ cent}}$) to the overall DM. Cold (T < 105K) and warm-hot (T = 105 − 107K) gas components make comparable contributions to DM for FRBs at z = 1, with the former component making an increasingly larger contribution towards higher redshift. We provide a detailed DM distribution of FRBs at z = 0.25 to z = 2 that may be compared to observations. We also compute the relation between the Compton y parameter and DM, finding a strong correlation, y∝DM4, providing an additional, independent constraint on the nature of the DM of FRBs.

中文翻译：

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星系际介质引起的快速射电暴的色散测量分布

利用宇宙学流体动力学模拟，我们量化了快速射电暴 (FRB) 的色散测量 (DM) 的分布。我们检查了冷、暖热和热气体对总 DM 的贡献。我们发现，平均而言，热气成分（T > 107K）对整体 DM 的贡献很小（$\le 5{{\ \rm per\ cent}}$）。对于 z = 1 的 FRB，冷 (T < 105K) 和暖热 (T = 105 - 107K) 气体成分对 DM 的贡献相当，前者对更高红移的贡献越来越大。我们提供了在 z = 0.25 到 z = 2 时 FRB 的详细 DM 分布，可以与观察结果进行比较。我们还计算了康普顿 y 参数和 DM 之间的关系，发现了强相关性 y∝DM4，提供了一个额外的，