用\emph{Fermi}大面积望远镜研究SGR 1806-20/Cl* 1806-20区域
Studying the SGR 1806-20/Cl* 1806-20 region using the \emph{Fermi} Large Area Telescope
摘要：
SGR 1806-20及其宿主星团Cl* 1806-20周围的区域是一个潜在的重要粒子加速场。软$γ-$射线中继器和Cl* 1806-20，其中还包含几颗非常大质量的恒星，包括一颗明亮的蓝色变星超巨星LBV 1806-20，能够向周围环境沉积大量的能量。利用\emph{Fermi}大面积望远镜（LAT）获得的数据，我们确定了Cl* 1806-20西南部的扩展LAT源。1-50~GeV发射的形心与HESS J1808-204的形心一致（迄今为止尚未确定）。LAT谱最符合破缺能量为$E_\mathrm{b}=297\pm15$ MeV的破缺幂律。高于$E_\mathrm{b}$的指数是$2.60\pm0.04$，与HESS J1808-204的通量和光谱指数在100 GeV以上一致，表明两个源之间存在关联。同时，相互作用超新星遗迹SNR G9.7-0.0也是LAT通量的潜在贡献者。还报告了在45天间隔期间（2011年1月21日至2011年3月7日）MeV波段的暂定通量增强。我们讨论了扩展LAT源的背景下，轻子和强子的情况下可能的起源。
英文摘要：
The region around SGR 1806-20 and its host stellar cluster Cl* 1806-20 is a potentially important site of particle acceleration. The soft $γ-$ray repeater and Cl* 1806-20, which also contains several very massive stars including a luminous blue variable hypergiant LBV 1806-20, are capable of depositing a large amount of energy to the surroundings. Using the data taken with the \emph{Fermi} Large Area Telescope (LAT), we identified an extended LAT source to the south-west of Cl* 1806-20. The centroid of the 1-50~GeV emission is consistent with that of HESS J1808-204 (until now unidentified). The LAT spectrum is best-fit by a broken power-law with the break energy $E_\mathrm{b}=297\pm15$ MeV. The index above $E_\mathrm{b}$ is $2.60\pm0.04$, and is consistent with the flux and spectral index above 100 GeV for HESS J1808-204, suggesting an association between the two sources. Meanwhile, the interacting supernova remnant SNR G9.7-0.0 is also a potential contributor to the LAT flux. A tentative flux enhancement at the MeV band during a 45-day interval (2011 Jan 21 - 2011 Mar 7) is also reported. We discuss possible origins of the extended LAT source in the context of both leptonic and hadronic scenarios.
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