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arXiv 0908.0513astro-ph.HEastro-ph.CO
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超高能质子的同步辐射和GRB 080916 C的费米观测

Synchrotron radiation from ultra-high energy protons and the Fermi observations of GRB 080916C

Soebur Razzaque, Charles D. Dermer, Justin D. Finke

摘要:

费米伽玛射线望远镜数据GRB 080916 C与~ 1 e55 erg的表观各向同性伽玛射线能量,显示了几秒之间的延迟上升的100 MeV-GeV的辐射相比,keV-MeV的辐射。在这里,我们表明,同步辐射从宇宙射线质子加速伽玛暴,延迟质子同步冷却时标在射流的磁主导的冲击等离子体运动在高度相对论速度与散装洛伦兹因子伽玛~ 500,可以解释这一结果。来自衰减质子同步辐射的第二代电子同步加速器组件使增强的软X射线到MeV伽马射线发射。长GRB窄,高能喷流加速粒子到超高能量可以解释俄歇观测UHE宇宙射线的来源在100 Mpc的纳米高斯星系间磁场。质子同步加速器模型中的总能量需求与γ ^(16/3)成正比。GRB 080916 C的这个模型只有在Gamma ~< 500且喷流开度角~ 1度时才是合理的。

英文摘要:

Fermi gamma-ray telescope data of GRB 080916C with ~1e55 erg in apparent isotropic gamma-ray energy, show a several second delay between the rise of 100 MeV - GeV radiation compared with keV - MeV radiation. Here we show that synchrotron radiation from cosmic ray protons accelerated in GRBs, delayed by the proton synchrotron cooling timescale in a jet of magnetically-dominated shocked plasma moving at highly relativistic speeds with bulk Lorentz factor Gamma ~ 500, could explain this result. A second generation electron synchrotron component from attenuated proton synchrotron radiation makes enhanced soft X-ray to MeV gamma-ray emission. Long GRBs with narrow, energetic jets accelerating particles to ultra-high energies could explain the Auger observations of UHE cosmic rays from sources within 100 Mpc for nano-Gauss intergalactic magnetic fields. The total energy requirements in a proton synchrotron model are proportional to Gamma^(16/3). This model for GRB 080916C is only plausible if Gamma ~< 500 and the jet opening angle is ~ 1 degree.

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