arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.5783astro-ph.HEastro-ph.GA
收藏

H.E.S.S观测到的银河系中心区域

The Galactic Center region viewed by H.E.S.S

A. Viana

摘要:

银河系中心区域是银河系中最活跃的区域,拥有丰富的所有波长的光子源。H.E.S.S.对银河系中心(GC)区域的观测首次揭示了非常高能量(VHE,E> 100 GeV)伽马射线的银河系最内部100 pc的详细视图,并为GC附近高能粒子的加速过程和传播提供了有价值的探测。H.E.S.S.自2003年开始以来,已经对GC区域进行了超过180小时的高质量观测。在超大质量黑洞Sgr A* 的位置上发现了一个强而稳定的伽马射线源。除了中心点状源之外,还在GC周围约1 $^{\circ}$范围内检测到沿银道面延伸的漫发射。对银河系中心区域的精确分析表明,弥散发射可能在整个GC源光谱的最高能量端占主导地位。我将审查H.E.S.S.当前的VHE视图。并简要讨论了解释中心源和扩散源VHE γ射线发射的理论模型。

英文摘要:

The Galactic center region is the most active region in the Milky Way harboring a wealth of photon sources at all wavelengths. H.E.S.S. observations of the Galactic Center (GC) region revealed for the first time in very high energy (VHE, E> 100 GeV) gamma-rays a detailed view of the innermost 100 pc of the Milky Way and provided a valuable probe for the acceleration processes and propagation of energetic particles near the GC. H.E.S.S. has taken more than 180 hours of good-quality observations toward the GC region since the experience started in 2003. A strong and steady gamma-ray source has been detected coincident in position with the supermassive black hole Sgr A*. Besides the central pointlike source, a diffuse emission extended along the Galactic Plane has been detected within about 1$^{\circ}$ around the GC. An accurate analysis of the Galactic center region suggests that the diffuse emission may dominate highest energy end of the overall GC source spectrum. I will review the current VHE view by H.E.S.S. of the GC region and briefly discuss the theoretical models which explain VHE gamma-ray emissions of the central source and the diffuse emission.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑