演化星系中的相对论性喷流反馈
Relativistic Jet Feedback in Evolving Galaxies
摘要：
在宇宙时间里，星系通过较小星系的分层合并而成长。然而，星系光度函数的亮区与最简单的等级合并理论不相容，认为来自宿主星系中心黑洞的反馈减少了亮星系的数量，并调节了黑洞和宿主星系的共同演化。许多星系演化的模拟都试图包含这种反馈的物理效应，其分辨率通常超过千秒差距。然而，喷流和星际介质之间的相互作用涉及的过程发生在小于千秒差距的尺度上。为了进一步了解发生在这样的尺度上的过程，我们提出了一套模拟的相对论射流与分形两相星际介质的分辨率为2秒差距和一个千秒差距的最大规模。能量和动量向星际介质的转移是相当可观的，我们发现，功率在10^43-10^46尔格·s^-1范围内的喷流可以通过分散星系核心的致密气体来抑制恒星的形成。我们确定这个过程的有效性作为一个函数的比率的喷流功率的爱丁顿光度的黑洞，的压力的星际介质和致密气体的孔隙度。
英文摘要：
Over cosmic time, galaxies grow through the hierarchical merging of smaller galaxies. However, the bright region of the galaxy luminosity function is incompatible with the simplest version of hierarchical merging, and it is believed that feedback from the central black hole in the host galaxies reduces the number of bright galaxies and regulates the co-evolution of black hole and host galaxy. Numerous simulations of galaxy evolution have attempted to include the physical effects of such feedback with a resolution usually exceeding a kiloparsec. However, interactions between jets and the interstellar medium involve processes occurring on less than kiloparsec scales. In order to further the understanding of processes occurring on such scales, we present a suite of simulations of relativistic jets interacting with a fractal two-phase interstellar medium with a resolution of two parsecs and a largest scale of one kiloparsec. The transfer of energy and momentum to the interstellar medium is considerable, and we find that jets with powers in the range of 10^43-10^46 erg s^-1 can inhibit star formation through the dispersal of dense gas in the galaxy core. We determine the effectiveness of this process as a function of the ratio of the jet power to the Eddington luminosity of the black hole, the pressure of the interstellar medium and the porosity of the dense gas.
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