Hadronic jet models today
Hadronic jet models today
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DOI：
10.1017/s1743921310015644
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
M. Sikora
中科院分区：
文献类型：
--
作者：
M. Sikora
活动星系核中相对论性喷流的物质成分主要是质子、电子和正电子的混合物。在耗散事件期间，这些粒子利用射流的大部分内部能量和/或动能，并将其转化为电磁辐射。虽然轻子--即使是那些只具有温和相对论能量的轻子--可以有效地辐射，但质子需要被加速到超过1016-19 eV的能量，才能通过触发对级联或直接同步辐射来辐射耗散大量的能量。在这里，我回顾了强子非绝热冷却过程在形成耀变体的高能谱中的作用所受到的各种限制。有人认为，质子，尽管被有效地加速，并可能发挥关键作用的喷流动力学和耗散的喷流动能的内部能量的电子和正电子，更有可能保持被动的活动星系核喷流的辐射。
Abstract The matter content of relativistic jets in AGNs is dominated by a mixture of protons, electrons, and positrons. During dissipative events these particles tap a significant portion of the internal and/or kinetic energy of the jet and convert it into electromagnetic radiation. While leptons – even those with only mildly relativistic energies – can radiate efficiently, protons need to be accelerated up to energies exceeding 1016–19 eV to dissipate radiatively a significant amount of energy via either trigerring pair cascades or direct synchrotron emission. Here I review various constraints imposed on the role of hadronic non-adiabatic cooling processes in shaping the high energy spectra of blazars. It will be argued that protons, despite being efficiently accelerated and presumably playing a crucial role in jet dynamics and dissipation of the jet kinetic energy to the internal energy of electrons and positrons, are more likely to remain radiatively passive in AGN jets.