椭圆星系碰撞到AGN爆发的同步辐射
Synchrotron Emission from Elliptical Galaxies Consequent to AGN outbursts
摘要：
来自活动星系核的辐射反馈和机械反馈对椭圆星系的演化都有重要作用。我们计算如何冲击可能被驱动从中央黑洞的气体信封的椭圆星系的机械以及辐射反馈（以核风的形式）使用高分辨率1-D流体动力学模拟。我们计算了椭圆星系中心激波（而非喷流）加速的电子宇宙射线的同步辐射，并利用标准的扩散激波加速机制研究了同步辐射谱的演化，该机制通常应用于超新星遗迹的标度体积情况。我们发现通过这种机制产生的同步辐射与现存的椭圆星系正在经历爆发的观测定量之间有很好的协议。此外，我们还发现，同步辐射光学和X射线辐射可以共存的椭圆星系在一定阶段的演变之后，中央爆发。实际上，我们的计算预测了$\sim 1.3\times 10^6 L_{\odot}$在5 GHz频率（无线电波段）、$\sim 1.1\times 10^6 L_{\odot}$在$4.3\times10^{14}$ Hz（R波段，对应于绝对星等-10.4）和$\sim 1.5\times 10^{7} L_{\odot}$在$2.4\times10^{17}$ Hz（软X射线，0.5 - 2.0 keV波段）的同步辐射光度。
英文摘要：
Both radiative and mechanical feedback from Active Galactic Nuclei have been found to be important for the evolution of elliptical galaxies. We compute how a shock may be driven from a central black hole into the gaseous envelope of an elliptical galaxy by mechanical as well as radiative feedback (in the form of nuclear winds) using high resolution 1-D hydrodynamical simulations. We calculate the synchrotron emission from the electron cosmic rays accelerated by the shocks (not the jets) in the central part of elliptical galaxies, and we also study the synchrotron spectrum's evolution using the standard diffusive shock acceleration mechanism, which is routinely applied to the scaled volume case of supernova remnants. We find good agreement quantitatively between the synchrotron radio emission produced via this mechanism with extant observations of elliptical galaxies which are undergoing outbursts. Additionally, we also find that synchrotron optical and X-ray emission can co-exist inside elliptical galaxies during a certain phase of evolution subsequent to central outbursts. In fact, our calculations predict a synchrotron luminosity of $\sim 1.3\times 10^6 L_{\odot}$ at the frequency 5 GHz (radio band), of $\sim 1.1\times 10^6 L_{\odot}$ at $4.3\times10^{14}$ Hz (R band, corresponding to the absolute magnitude -10.4), and of $\sim 1.5\times 10^{7} L_{\odot}$ at $2.4\times10^{17}$ Hz (soft X-ray, 0.5 -- 2.0 keV band).
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