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arXiv 1005.3025astro-ph.HEhep-ph
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FR I放射性镓高能辐射的轻强子模型

A lepto-hadronic model for high-energy emission from FR I radiogalaxies

M. M. Reynoso, M. C. Medina, G. E. Romero

摘要:

众所周知的放射性镓Cen A最近被HESS实验检测到是一种非常高能量(VHE)的伽马射线源,就在费米/LAT在高能量(HE)检测到它之前。这一探测以及对M87的探测表明,放射性镓是VHE伽马射线发射体。本工作的目的是提出一个相对论性喷流VHE辐射的轻强子模型。我们认为质子和电子在喷流底部附近的一个紧凑的区域中被加速,当它们沿着喷流传播时,它们冷却并发射多波长辐射。质子和电子的分布是通过一个非均匀的稳态传输方程,考虑到加速,辐射和非辐射冷却过程,以及粒子的对流传输。考虑到不同波长光子吸收的影响,计算了初级质子和电子的辐射,以及次级粒子(e+/-、π介子和μ介子)的贡献。最后给出了高能中微子信号,并讨论了利用KM 3 Net和IceCube进行探测的可能性。在我们的模型中得到的光谱能量分布与一组适当的参数为扩展的发射区可以解释大部分的观测光谱的活动星系核。

英文摘要:

The well know radiogalaxy Cen A has been recently detected as a source of very high energy (VHE) gamma-rays by the HESS experiment just before Fermi/LAT detected it at high energies (HE). The detection, together with that of M87, establishes radiogalaxies as VHE gamma-ray emitters. The aim of this work is to present a lepto-hadronic model for the VHE emission from the relativistic jets in FR I radiogalaxies. We consider that protons and electrons are accelerated in a compact region near the base of the jet, and they cool emitting multi wavelength radiation as they propagate along the jet. The proton and electron distributions are obtained through an inhomogeneous steady-state transport equation taking into account acceleration, radiative and non-radiative cooling processes, as well as particle transport by convection. Considering the effects of photon absorption at different wavelengths, we calculate the radiation emitted by the primary protons and electrons, as well as the contribution of secondaries particles (e+/-, pions and muons). The expected high-energy neutrino signal is also obtained and the possibility of detections with KM3Net and IceCube is discussed. The spectral energy distribution obtained in our model with an appropriate set of parameters for an extended emission zone can account for much of the observed spectrum for both AGNs.

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