论文标题
MBM 53、54和55个分子云以及高线轮廓，HI线轮廓，灰尘和伽马射线数据显示的气体和宇宙射线特性
Gas and Cosmic-Ray Properties in the MBM 53, 54, and 55 Molecular Clouds and the Pegasus Loop as Revealed by HI Line Profiles, Dust, and Gamma-Ray Data
论文作者
论文摘要
在研究星际培养基（ISM）和银河宇宙射线（CRS）时，星际气体密度的不确定性一直是一个问题。为了克服这一难度，我们使用了21厘米HI线发射的组件分解，并在对Fermi大面积望远镜（LAT）获得的$γ$ ray数据中使用了所得的气体图，用于MBM〜53、54和55个分子云和Pegasus和Pegasus loop。我们使用与HI4PI调查，Planck Dust-Susmiss-Susmiss-Model和Fermi-Lat $γ$ -RAER REARE数据的详细相关性，将ISM气体分解为中速云，狭窄线和光学较厚的HI，狭窄的HI，狭窄的HI，狭窄的HI，宽线和光学较薄的HI，Co-Bright H2和Co-Dark H2。我们发现对HI柱密度的光学深度校正的分数和Co-Dark H2几乎相等。我们同时拟合了直接测量的Cr光谱，并同时拟合了$γ$ ray的发射光谱。我们在$ {\ sim} $ 7〜GEV的星际质子光谱中获得了光谱中断，并发现$γ$ ray的发射率正常化与10 \％以内的AMS-02质子谱相吻合，使张力在以前声称的CR光谱中放松张力。
In studying the interstellar medium (ISM) and Galactic cosmic rays (CRs), uncertainty of the interstellar gas density has always been an issue. To overcome this difficulty, we used a component decomposition of the 21-cm HI line emission and used the resulting gas maps in an analysis of $γ$-ray data obtained by the Fermi Large Area Telescope (LAT) for the MBM~53, 54, and 55 molecular clouds and the Pegasus loop. We decomposed the ISM gas into intermediate-velocity clouds, narrow-line and optically thick HI, broad-line and optically thin HI, CO-bright H2, and CO-dark H2 using detailed correlations with the HI line profiles from the HI4PI survey, the Planck dust-emission model, and the Fermi-LAT $γ$-ray data. We found the fractions of optical depth correction to the HI column density and CO-dark H2 to be nearly equal. We fitted the CR spectra directly measured at/near the Earth and the measured $γ$-ray emissivity spectrum simultaneously. We obtained a spectral break in the interstellar proton spectrum at ${\sim}$7~GeV, and found the $γ$-ray emissivity normalization agrees with the AMS-02 proton spectrum within 10\%, relaxing the tension with the CR spectra previously claimed.
