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arXiv 0807.1962astro-ph
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短硬伽马射线暴及其余辉

Short Hard Gamma Ray Bursts And Their Afterglows

Shlomo Dado, Arnon Dar

摘要:

长持续时间的伽马射线暴(GRB)和X射线闪光(XRF)是由核心坍缩超新星爆炸中喷出的高度相对论喷流产生的。短硬伽马射线暴(SHB)的起源尚未确定。它们可能是由各种过程中喷射出的高度相对论性喷流产生的:致密恒星物体的合并;紧密双星中致密恒星或致密恒星区域中中等质量黑洞的大质量吸积事件;致密恒星的相变。这类事件的自然环境是球状星团的致密核心、超巨星星团和年轻超新星遗迹。我们已经使用了伽玛暴的炮弹模型来分析所有的雨燕SHB与良好采样的X射线余辉。我们发现,他们的提示伽玛射线发射可以解释由逆康普顿散射(ICS)的祖先的荣耀光,和他们的扩展软发射组成部分ICS的高密度光或同步辐射(SR)在高密度星际介质内的集群。余辉的产生机制是星团外的同步辐射。在060614和060505附近的低光度伽玛暴中没有发现相关的超新星。我们将其解释为相对远离轴的SHB。

英文摘要:

Long duration gamma ray bursts (GRBs) and X-ray flashes (XRFs) are produced by highly- relativistic jets ejected in core-collapse supernova explosions. The origin of short hard gamma-ray bursts (SHBs) has not been established. They may be produced by highly relativistic jets ejected in various processes: mergers of compact stellar objects; large-mass accretion episodes onto compact stars in close binaries or onto intermediate-mass black holes in dense stellar regions; phase transition of compact stars. Natural environments of such events are the dense cores of globular clusters, superstar clusters and young supernova remnants. We have used the cannonball model of GRBs to analyze all Swift SHBs with a well-sampled X-ray afterglow. We show that their prompt gamma-ray emission can be explained by inverse Compton scattering (ICS) of the progenitor's glory light, and their extended soft emission component by ICS of high density light or synchrotron radiation (SR) in a high density interstellar medium within the cluster. The mechanism generating the afterglow is synchrotron radiation outside the cluster. No associated supernova could be detected in the low luminosity nearby GRBs 060614 and 060505. We interpret them as SHBs seen relatively far off axis.

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