半人马座A的动态年龄
The Dynamic Age of Centaurus A
摘要：
在本文中，我提出了动态模型的射电源半人马座A，并批评可能的模型，在原位粒子再加速（ISR）内的无线电波瓣。无线电和伽马射线数据既不需要均匀等离子体，也不需要等离子体和磁场之间的准均分;包含高场和低场区域的非均匀模型同样可能。Cen A不可能像它的相对论性电子的辐射寿命那样年轻，从几百万年到几十百万年不等。两类动态模型-流驱动和磁驱动-是一致的，与目前的观察，每一个要求岑A是一个陀螺的顺序。因此，正在进行的ISR必须发生在无线电源内。阿尔芬波ISR可能发生在整个源，并可能负责维持伽马射线响亮的电子。它很可能是由冲击或重联ISR补充，维持在高场区域的无线电响亮的电子。
英文摘要：
In this paper I present dynamic models of the radio source Centaurus A, and critique possible models of in situ particle reacceleration (ISR) within the radio lobes. The radio and gamma-ray data require neither homogeneous plasma nor quasi-equipartition between plasma and magnetic field; inhomogeneous models containing both high-field and low-field regions are equally likely. Cen A cannot be as young as the radiative lifetimes of its relativistic electrons, which range from a few to several tens of Myr. Two classes of dynamic models -- flow driven and magnetically driven -- are consistent with current observations; each requires Cen A to be on the order of a Gyr old. Thus, ongoing ISR must be occurring within the radio source. Alfven-wave ISR is probably occurring throughout the source, and may be responsible for maintaining the gamma-ray-loud electrons. It is likely to be supplemented by shock or reconnection ISR which maintains the radio-loud electrons in high-field regions.
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