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arXiv 0810.1035astro-ph
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质子微类星体

The proton microquasar

Gabriela S. Vila, Gustavo E. Romero

摘要:

我们提出了一个微类星体的高能发射模型,其中喷流的能量含量主要是由相对论质子。我们还包括一个主轻子分量。粒子在靠近喷流底部的一个紧凑区域中被加速到相对论能量,大部分发射都是在那里产生的。我们计算了质子和电子同步辐射以及光强子相互作用产生的谱。加速区的同步辐射提供质子-光子碰撞的靶场。在具有显著轻子分量的模型中,强的内部光子-光子吸收可以衰减高能量下的发射光谱。根据这些参数的不同,我们的模型预测出的亮度范围为10^34-10^37 erg·s^-1,最高可达GeV,并有一个高能拖尾,最高可达10^16 eV。然而,在某些情况下,吸收效应可以完全抑制10 GeV以上的发射,从而产生不同的光谱形状。这些结果可以在不久的将来通过GLAST-Fermi,HESS II和MAGIC II等仪器的观测进行验证。

英文摘要:

We present a model for high-energy emission in microquasars where the energy content of the jets is dominated by relativistic protons. We also include a primary leptonic component. Particles are accelerated up to relativistic energies in a compact region located near the base of the jet, where most of the emission is produced. We calculate the production spectrum due to proton and electron synchrotron radiation and photohadronic interactions. The target field for proton-photon collisions is provided by the synchrotron radiation in the acceleration region. In models with a significant leptonic component, strong internal photon-photon absorption can attenuate the emission spectrum at high energies. Depending on the values of the parameters, our model predicts luminosities in the range 10^34-10^37 erg s^-1 up to GeV energies, with a high-energy tail that can extend up to 10^16 eV. In some cases, however, absorption effects can completely suppress the emission above 10 GeV, giving rise to different spectral shapes. These results can be tested in the near future by observations with instruments like GLAST-Fermi, HESS II and MAGIC II.

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