THE MORPHOLOGY OF HADRONIC EMISSION MODELS FOR THE GAMMA-RAY SOURCE AT THE GALACTIC CENTER
THE MORPHOLOGY OF HADRONIC EMISSION MODELS FOR THE GAMMA-RAY SOURCE AT THE GALACTIC CENTER
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DOI：
10.1088/0004-637x/753/1/41
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
T. Linden;E. Lovegrove;S. Profumo
中科院分区：
文献类型：
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作者：
T. Linden;E. Lovegrove;S. Profumo
最近，多个γ射线望远镜报告了在银河系中心位置探测到的高能γ射线源，其能量范围在100 MeV到100TeV之间。对这些信号的分析强烈表明，TeV发射的形态与点源的形态一致，最高可达Hess望远镜的角分辨率(约3pc)，而GeV发射的点源性质目前尚不确定，有迹象表明它可能在空间上延伸。在发射是强子且处于稳态的情况下，我们证明了预期的γ射线形态是由目标气体的分布决定的，而不是由宇宙线注入和传播的细节决定的。具体地说，我们预计很大一部分强子辐射将与环绕核环的位置一致，该环位于距离银河系中心1至3pC之间。我们注意到，即将到来的切伦科夫望远镜阵列将能够观测到TeVγ射线源的形态和观测到的气体密度之间的决定性关联，令人信服地确认或排除γ射线发射的强子来源。
Recently, detections of a high-energy γ-ray source at the position of the Galactic center have been reported by multiple γ-ray telescopes, spanning the energy range between 100 MeV and 100 TeV. Analysis of these signals strongly suggests the TeV emission to have a morphology consistent with a point source up to the angular resolution of the HESS telescope (approximately 3 pc), while the point-source nature of the GeV emission is currently unsettled, with indications that it may be spatially extended. In the case that the emission is hadronic and in a steady state, we show that the expected γ-ray morphology is dominated by the distribution of target gas, rather than by details of cosmic-ray injection and propagation. Specifically, we expect a significant portion of hadronic emission to coincide with the position of the circumnuclear ring, which resides between 1 and 3 pc from the Galactic center. We note that the upcoming Cherenkov Telescope Array (CTA) will be able to observe conclusive correlations between the morphology of the TeV γ-ray source and the observed gas density, convincingly confirming or ruling out a hadronic origin for the γ-ray emission.