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arXiv 0908.0931astro-ph.HE
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来自大质量原恒星的伽马射线

Gamma-rays from massive protostars

Gustavo E. Romero, Anabella T. Araudo, Valenti Bosch-Ramon, Josep M. Paredes

摘要:

大质量的原恒星与速度为数百公里/秒的两极外流有关。这种外流在与周围介质相互作用时产生强烈的冲击,导致非热无线电发射区域。在一定条件下,在原恒星喷流的终端激波处加速的相对论粒子群可以产生显著的γ射线辐射。我们估计的条件下,高能量发射的非热热点的喷气机与大规模的原恒星嵌入在密集的分子云。我们的研究结果表明,粒子-物质的相互作用可以导致检测到的分子云托管大规模的年轻恒星物体的费米卫星在MeV-GeV的能量,甚至切伦科夫望远镜阵列在GeV-TeV的范围。伽玛射线天文学可以用来探测恒星形成区的物理条件和大质量分子云复杂环境中的粒子加速过程。

英文摘要:

Massive protostars have associated bipolar outflows with velocities of hundreds of km/s. Such outflows produce strong shocks when interact with the ambient medium leading to regions of non-thermal radio emission. Under certain conditions, the population of relativistic particles accelerated at the terminal shocks of the protostellar jets can produce significant gamma-ray emission. We estimate the conditions necessary for high-energy emission in the non-thermal hot spots of jets associated with massive protostars embedded in dense molecular clouds. Our results show that particle-matter interactions can lead to the detection of molecular clouds hosting massive young stellar objects by the Fermi satellite at MeV-GeV energies and even by Cherenkov telescope arrays in the GeV-TeV range. Astronomy at gamma-rays can be used to probe the physical conditions in star forming regions and particle acceleration processes in the complex environment of massive molecular clouds.

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。

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