Fermi LAT study of cosmic-rays and the interstellar medium in nearby molecular clouds
Fermi LAT study of cosmic-rays and the interstellar medium in nearby molecular clouds
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DOI：
10.1063/1.4792564
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
K. Hayashi;T. Mizuno
中科院分区：
文献类型：
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作者：
K. Hayashi;T. Mizuno
我们报告的星际伽马射线发射附近的分子云Chamaeleon，南冕座R（R CrA），仙王座和北极星耀斑区域与费米大面积望远镜（LAT）的分析。得到的γ射线发射率从250 MeV到10 GeV是（5.9 ± 0.1stat−1.0sys+0.9）×10−27 photons s−1 sr−1 H-atom−1，（10.2 ± 0.4stat−1.7sys + 1.2）×10−27光子s−1 sr−1 H-atom−1，以及（9.1±0.3stat−0.6sys+1.5）×10−27光子s−1 sr−1 H-原子−1分别对应于变色龙、R CrA、仙王座和北极星耀斑区域，这表明即使我们考虑系统的不确定性，CR密度在三个区域之间的变化也有20%。分子质量校准比Xco = N（H2）/Wco被发现为：（0.96 ± 0.06stat−0.12sys+0.15）× 1020 H2-分子cm−2（K km s−1）−1，（0.99 ± 0.08stat−0.10sys+0.18）× 1020 H2-分子cm−2（K km s-1）-1，和（0.63 ± 0.02stat-0.07sys + 0.09）× 1020 H2-分子cm-2（K km s-1）-1分别对应于变色龙、R CrA以及仙王座和北极星耀斑区域，这表明.
We report an analysis of the interstellar gamma-ray emission from nearby molecular clouds Chamaeleon, R Coronae Australis (R CrA), and Cepheus and Polaris flare regions with the Fermi Large Area Telescope (LAT). The obtained gamma-ray emissivities from 250 MeV to 10 GeV are (5.9 ± 0.1stat−1.0sys+0.9)×10−27 photons s−1 sr−1 H-atom−1, (10.2 ± 0.4stat−1.7sys + 1.2)×10−27 photons s−1 sr−1 H-atom−1, and (9.1±0.3stat−0.6sys+1.5)×10−27 photons s−1 sr−1 H-atom−1 for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively, indicating a variation of the CR density by ∼20% among the three regions, even if we consider the systematic uncertainties. The molecular mass calibration ratio, Xco = N(H2)/Wco, is found to be (0.96 ± 0.06stat−0.12sys+0.15)×1020H2-molecule cm−2 (K km s−1)−1, (0.99 ± 0.08stat−0.10sys+0.18)×1020H2-molecule cm−2 (K km s−1)−1, and (0.63 ± 0.02stat−0.07sys + 0.09)×1020H2-molecule cm−2 (K km s−1)−1 for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively, sug...