论文标题
使用伽马射线和灰尘称量当地的星际介质
Weighing the Local Interstellar Medium using Gamma Rays and Dust
论文作者
论文摘要
冷气构成银河系磁盘的显着质量分数，但最不确定的男性元件。冷气的密度和分布对于银河系动力学以及恒星和银河进化的模型至关重要。先前的研究使用了气体和灰尘之间的相关性，以获得冷气的高分辨率测量，但具有较大的规范化不确定性。我们提出了一种新的方法，该方法使用费米 - 拉特$γ$ ray数据来测量总气体密度，达到与以前的工作相似的精度，但具有独立的系统不确定性。值得注意的是，我们的结果具有足够的精度来探测通过当前世界领先实验获得的结果范围。
Cold gas forms a significant mass fraction of the Milky Way disk, but is its most uncertain baryonic component. The density and distribution of cold gas is of critical importance for Milky Way dynamics, as well as models of stellar and galactic evolution. Previous studies have used correlations between gas and dust to obtain high-resolution measurements of cold gas, but with large normalization uncertainties. We present a novel approach that uses Fermi-LAT $γ$-ray data to measure the total gas density, achieving a similar precision as previous works, but with independent systematic uncertainties. Notably, our results have sufficient precision to probe the range of results obtained by current world-leading experiments.
