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arXiv 1410.7553astro-ph.HE
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疏散星团中大质量双星系统稠密环境中的γ射线和中微子

Gamma-rays and neutrinos from dense environment of massive binary systems in open clusters

W. Bednarek, J. Pabich, T. Sobczak

摘要:

最近在几个含有大质量恒星的疏散星团中观测到TeV的γ射线辐射。我们认为高能量的过程中发生的大质量的双星系统,并在其密集的环境中,假设核,从大质量恒星的恒星风,加速在碰撞区域的恒星风。我们计算了这些核在与恒星辐射和双星系统中大质量伴星的风物质碰撞时碎裂产生的质子和中子的注入率。质子和中子可以在恒星风腔和疏散星团内与物质相互作用,产生π介子,π介子衰变为$γ$射线和中微子。我们讨论的探测能力,这种$γ$射线发射的情况下,目前和未来的切伦科夫望远镜的两个二元系统船底座伊塔,在船底座星云,WR 20 a,在Westerlund 2疏散星团。我们还计算了质子在双星系统周围和疏散星团内产生的中微子通量。这种中微子发射面临着ANTARES对离散源中微子通量的上限和IceCube的灵敏度。

英文摘要:

TeV gamma-ray emission has been recently observed from direction of a few open clusters containing massive stars. We consider the high energy processes occurring within massive binary systems and in their dense environment by assuming that nuclei, from the stellar winds of massive stars, are accelerated at the collision region of the stellar winds. We calculate the rates of injection of protons and neutrons from fragmentation of these nuclei in collisions with stellar radiation and matter of the winds from the massive companions in binary system. Protons and neutrons can interact with the matter, within the stellar wind cavity and within the open cluster, producing pions which decay into $γ$-rays and neutrinos. We discuss the detectability of such $γ$-ray emission by the present and future Cherenkov telescopes for the case of two binary systems Eta Carinae, within the Carina Nebula, and WR 20a, within the Westerlund 2 open cluster. We also calculate the neutrino fluxes produced by protons around the binary systems and within the open clusters. This neutrino emission is confronted with ANTARES upper limits on the neutrino fluxes from discrete sources and with the sensitivity of IceCube.

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