Generation of a Fireball in AGN Hot Plasmas
Generation of a Fireball in AGN Hot Plasmas
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DOI：
10.1086/509756
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发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
K. Asano;F. Takahara
中科院分区：
文献类型：
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作者：
K. Asano;F. Takahara
受活动星系核中观测到的相对论喷流的启发，我们模拟了与光子强耦合的电子-正电子对从正常的电子-质子等离子体中流出。利用多流体近似和辐射传输的MonteCarlo方法，我们得到了光度L ≤ 1047 ergs-1的辐射和对外流的球对称定常解。在微观物理方面，考虑了库仑散射、康普顿散射、韧致辐射和电子-正电子对的湮灭和产生。虽然由于强大的辐射力，大量的电子对以温和的相对论速度流出，但温度不足以在火球变得光学薄到散射之前避免电子对湮灭。模拟中的几个警告也进行了讨论。
Motivated by relativistic jets observed in active galactic nuclei, we simulate outflows of electron-positron pairs strongly coupled with photons from normal electron-proton plasmas. Using multifluid approximation and a Monte Carlo method of radiative transfer, we obtain spherically symmetric, steady solutions of radiation and pair outflows for the luminosity L ≤ 1047 ergs s-1. For the microphysics, Coulomb scattering, Compton scattering, bremsstrahlung, and electron-positron pair annihilation and creation are taken into account. Although a significant amount of pairs outflow with a mildly relativistic velocity because of the powerful radiative force, the temperature is not high enough to avoid pair annihilation before the fireball becomes optically thin to scattering. Several caveats in the simulations are also discussed.