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arXiv 0907.0732astro-ph.HE
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GRB发射的碰撞机制

Collisional mechanism for GRB emission

Andrei M. Beloborodov

摘要:

伽玛射线暴喷流中的核碰撞和库仑碰撞产生了热的电子-正电子等离子体。这种碰撞加热在射流仍然不透明时开始,并延伸到透明区域。电子等离子体辐射出它的能量。因此,大部分的射流能量被转换为具有明确定义的光谱的逃逸辐射。利用已知的碰撞率和膨胀射流中辐射转移的精确计算,详细模拟了这一过程。结果再现了观测到的伽玛暴的光谱,其峰值通常在1 MeV附近,并延伸到光子指数β~-2.5的更高的能量。这表明碰撞加热可能是伽玛暴辐射的主要机制。

英文摘要:

Nuclear and Coulomb collisions in GRB jets create a hot electron-positron plasma. This collisional heating starts when the jet is still opaque and extends to the transparent region. The e+- plasma radiates its energy. As a result, a large fraction of the jet energy is converted to escaping radiation with a well-defined spectrum. The process is simulated in detail using the known rates of collisions and accurate calculations of radiative transfer in the expanding jet. The result reproduces the spectra of observed GRBs that typically peak near 1 MeV and extend to much higher energies with a photon index β~ -2.5. This suggests that collisional heating may be the main mechanism for GRB emission.

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