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arXiv 1704.07232astro-ph.HE
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伽马射线暴环境中的伽玛-伽玛吸收

Gamma-Gamma Absorption in Gamma-Ray Burst Environments

Markus Böttcher Lenté Dreyer

摘要:

伽马射线暴(GRB)是宇宙中最猛烈的爆炸,主要表现为明亮的伽玛射线短暂闪光。长伽马射线暴最有可能与一颗超大质量恒星的暴死有关。因此,它们被认为起源于最近或正在形成的恒星区域,其中有各种明亮的年轻恒星,例如OB协会。伽马射线暴是由星载伽马射线望远镜在MeV-GeV能量下探测到的,但也可能发射更高能量的伽马射线(甚高能伽马射线:E > 100 GeV),如纳米比亚的高能立体系统(H.E.S.S)等地面切伦科夫望远镜设施所观测到的。VHE伽马射线可以被低能光子通过对产生吸收,而伽玛暴附近的恒星提供了密集的辐射环境,这可能导致这种吸收。我们已经调查了有代表性的伽玛暴环境,并提供了一个估计的不透明度,伽玛射线吸收VHE伽玛射线从伽玛暴。我们发现,对于可能的性质的OB协会周围的伽玛射线暴的祖细胞,伽马-伽马吸收预计可以忽略不计。

英文摘要:

Gamma-ray bursts (GRBs) are the most violent explosions in the universe, seen primarily as bright, short flashes of gamma-rays. Long GRBs are most likely associated with the violent death of a very massive star. They are thus believed to originate within regions of recent or ongoing star formation with various bright, young stars, for instance, OB associations. GRBs have been detected in gamma-rays by satellite-borne gamma-ray telescopes at MeV - GeV energies, but could potentially also emit gamma-rays at even higher energies (Very-High-Energy [VHE] gamma-rays: E > 100 GeV), as observed by ground-based Cherenkov Telescope facilities, such as the High Energy Stereoscopic System (H.E.S.S) in Namibia. VHE gamma-rays can be absorbed by low energy photons by pair production, and the stars in the vicinity of a GRB provide a dense radiation environment, which could lead to such absorption. We have investigated representative GRB environments and provide an estimate of the opacity to gamma-gamma absorption for VHE gamma-rays from GRBs. We find that for the likely properties of OB associations around GRB progenitors, gamma-gamma absorption is expected to be negligible.

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