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arXiv 0811.1235astro-ph
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伽马射线暴同步辐射自康普顿模型中的瞬发GeV辐射

Prompt GeV emission in the synchrotron self-Compton model for Gamma-Ray Bursts

A. Panaitescu

摘要:

在10次爆发中检测到的光学对应物发射(即在瞬发GRB阶段期间)比爆发光谱外推到光学频率亮10-10000,表明GRB发射的同步加速器自康普顿起源,同步加速器产生光学对应物发射。在这个模型中,爆发光子的第二次上散射产生了一个即时的GeV-TeV的发射,其亮度强烈依赖于一个未知的量,主要同步加速器光谱的峰值能量。光学、γ射线和GeV瞬发通量的测量可以用来检验伽玛暴的同步辐射自康普顿模型,并直接确定伽玛暴的总辐射输出。对于一组29个伽玛暴与光学对应检测,我们发现,预期的GeV光子通量应与亚MeV的排放的注量,并应与光学对应的亮度,这些相关性的强度降低的同步峰值能量分布的宽度增加。如果亚MeV的爆发辐射非常明亮,而(固有的)光学对应物非常暗淡,那么与爆发光谱外推到更高能量一致的GeV瞬发辐射的检测将排除同步加速器自康普顿模型。

英文摘要:

The detection in 10 bursts of an optical counterpart emission (i.e. during the prompt GRB phase) that is 10-10000 brighter than the extrapolation of the burst spectrum to optical frequencies suggests a synchrotron self-Compton origin for the GRB emission, synchrotron producing the optical counterpart emission. In this model, the second upscattering of the burst photons yields a prompt GeV-TeV emission, whose brightness depends strongly on an unknown quantity, the peak energy of the primary synchrotron spectrum. Measurements of the optical, gamma-ray, and GeV prompt fluxes can be used to test the synchrotron self-Compton model for GRBs and to determine directly the total radiative output of GRBs. For a set of 29 GRBs with optical counterpart detections, we find that the expected GeV photon flux should correlate with the fluence of the sub-MeV emission and should anticorrelate with the brightness of the optical counterpart, the strength of these correlations decreasing for an increasing width of the synchrotron peak energy distribution. The detection of a GeV prompt emission consistent with the extrapolation of the burst spectrum to higher energies would rule out the synchrotron self-Compton model if the sub-MeV burst emission were very bright and the (intrinsic) optical counterpart were very dim.

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