Compton Scattering in the Klein-Nishina Regime Revisited
Compton Scattering in the Klein-Nishina Regime Revisited
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DOI：
10.1086/427405
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发表时间：
2005-03
期刊：
影响因子：
--
通讯作者：
M. Kusunose;F. Takahara
中科院分区：
文献类型：
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作者：
M. Kusunose;F. Takahara
在像3C 279这样的耀变体中，GeV的伽马射线被认为是由从外部源注入喷流的软光子的逆康普顿散射产生的。由于喷流的大体积洛伦兹因子，软光子的能量在喷流的同动系中发生多普勒频移，散射可能发生在Klein-Nishina区。虽然Klein-Nishina效应是众所周知的，但在blazar环境中的电子和发射光谱的性质还没有被详细研究。我们用电子的空间逃逸项求解电子的动力学方程，得到了射流中的电子能谱，并计算了观测到的发射谱。在计算中的康普顿损失的克莱因-西科制度，我们使用离散损失形式主义，考虑到在一个单一的散射显着的能量损失。尽管散射截面由于克莱因-西名效应而减小，但逆康普顿散射仍能发射出大量的伽马射线。当电子的注入光谱服从幂律时，由于Klein-Nishina效应，电子光谱不遵循破幂律，并且大量的高能电子保留在发射区中。
In blazars such as 3C 279, GeV gamma rays are thought to be produced by inverse Compton scattering of soft photons injected from external sources into the jet. Because of the large bulk Lorentz factor of the jet, the energy of soft photons is Doppler shifted in the comoving frame of the jet, and the scattering is likely to occur in the Klein-Nishina regime. Although the Klein-Nishina effects are well known, the properties of the electron and emission spectra have not been studied in detail in the environment of blazars. We solve the kinetic equation of electrons with the spatial escape term of the electrons to obtain the electron energy spectrum in the jet and calculate the observed emission spectrum. In calculations of the Compton losses in the Klein-Nishina regime, we use the discrete loss formalism to take into account the significant energy loss in a single scattering. Although the scattering cross section decreases because of the Klein-Nishina effects, ample gamma rays are emitted by inverse Compton scattering. When the injection spectrum of electrons obeys a power law, the electron spectrum does not follow a broken power law, as a result of the Klein-Nishina effects, and a large number of high-energy electrons remain in the emitting region.