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arXiv 0909.0306astro-ph.HEastro-ph.CO
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短GRB 090510中额外谱分量的强子模型

Hadronic Models for the Extra Spectral Component in the short GRB 090510

Katsuaki Asano, Sylvain Guiriec, Peter Mészáros

摘要:

由{ \it Fermi}探测到的短伽马射线暴GRB 090510显示出10 MeV和30 GeV之间的额外光谱分量,这是对更常见的低能($<10$ MeV)带分量的补充。一般来说,这种额外的成分可能来自加速的质子。特别是,逆康普顿发射从次级电子-正电子对和质子同步辐射的竞争模型再现的硬光谱的额外的GRB 090510的组件。在这里,使用蒙特卡罗模拟,我们测试强子的情况下对观察到的属性。为了用这些模型再现GeV附近的额外分量,质子注入各向同性等效光度需要大于$10^{55}$ erg/s。如此大的质子亮度对强子模型是一个挑战。

英文摘要:

A short gamma-ray burst GRB 090510 detected by {\it Fermi} shows an extra spectral component between 10 MeV and 30 GeV, an addition to a more usual low-energy ($<10$ MeV) Band component. In general, such an extra component could originate from accelerated protons. In particular, inverse Compton emission from secondary electron-positron pairs and proton synchrotron emission are competitive models for reproducing the hard spectrum of the extra component in GRB 090510. Here, using Monte Carlo simulations, we test the hadronic scenarios against the observed properties. To reproduce the extra component around GeV with these models, the proton injection isotropic-equivalent luminosity is required to be larger than $10^{55}$ erg/s. Such large proton luminosities are a challenge for the hadronic models.

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