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arXiv 0904.0209astro-ph.CO
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对AGN风体积填充因子的无线电限制

Radio constraints on the volume filling factors of AGN winds

A. J. Blustin, A. C. Fabian

摘要:

活动星系核风的质量外流率的计算对于理解活动星系核-星系反馈过程中活动星系核风所起的作用具有重要意义。然而,由于风的体积填充因子是未知的,因此很难估计质量流出率。在本文中,我们使用所观察到的无线电发射的约束条件,以获得上限的风分量在某些附近的活动星系核的体积填充因子。我们这样做是通过预测的1.4 GHz的无线电通量密度发射的这些组件,假设一个均匀的风,然后比较这些与观测到的通量密度为每个活动星系核在这个频率。我们发现,体积填充因子的上限在10^{-4}-0.5范围内。

英文摘要:

The calculation of mass outflow rates of AGN winds is of great importance in understanding the role that such winds play in AGN-galaxy feedback processes. The mass outflow rates are, however, difficult to estimate since the volume filling factors of the winds are unknown. In this paper, we use constraints imposed by the observed radio emission to obtain upper limits to the volume filling factors of wind components in certain nearby AGN. We do this by predicting the 1.4 GHz radio flux densities emitted by those components, assuming a uniform wind, and then comparing these with the observed flux densities for each AGN at this frequency. We find that the upper limits to the volume filling factors are in the range 10^{-4}-0.5.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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