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arXiv 2006.12259astro-ph.HE
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星暴驱动风中的高能过程

High-energy processes in starburst-driven winds

Ana Laura Müller, Gustavo E. Romero, Markus Roth

摘要:

星暴星系产生的大规模风是由位于星系盘中的恒星形成区的活动提供动力的。风的爆发所产生的圆盘的碎裂导致了云的形成。超音速外流引起的弓形激波出现在这样的云周围。本文讨论了相对论粒子的加速和非热辐射的产生。在弓形激波处加速的宇宙射线没有达到最高能量,尽管产生的高能光度是显著的。我们发现,在恒星暴增中,高达10%的伽马射线辐射可能来自星系盘外的这些源。离散X射线源与幂律组件也有望。

英文摘要:

Starburst galaxies generate large-scale winds powered by the activity in the star-forming regions located in the galactic disks. Fragmentation of the disk produced by the outbreak of the wind results in the formation of clouds. Bowshocks caused by the supersonic outflow appear around such clouds. In this paper we discuss the acceleration of relativistic particles and the production of non-thermal radiation in such scenario. Cosmic rays accelerated at the bowshocks do not reach the highest energies, although the high-energy luminosity generated is significant. We show that up to ~10% of the gamma-ray emission in starbursts might come from these sources outside the galactic disks. Discrete X-ray sources with a power-law component are also expected.

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