arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.3432astro-ph.GA
收藏

AGN演化中的爱丁顿比和吸积效率

Eddington ratio and accretion efficiency in AGN evolution

S. I. Raimundo, A. C. Fabian

摘要:

活动星系核(AGN)的宇宙学演化对于理解超大质量黑洞吸积机制以及宿主星系的演化具有重要意义。在这项工作中,我们包括非常低的爱丁顿比(10^{-3} - 10^{-2})的对象在一个演化的情况下,并比较结果与观测到的本地分布的黑洞。我们测试了几种可能性的活动星系核人口,考虑遮蔽和光度的依赖性,并调查的爱丁顿比和辐射吸积效率的演变的质量函数的形状上的作用。我们发现,三个不同的AGN种群可以演化的参数范围比通常认为的更宽,仍然是符合当地的质量函数。一般来说,我们解中的黑洞都在快速旋转。采用固定值的吸积效率和爱丁顿比既不能提供一个完整的知识的演化机制,也不符合低爱丁顿比对象的存在。

英文摘要:

The cosmological evolution of Active Galactic Nuclei (AGN) is important for understanding the mechanism of accretion onto supermassive black holes, and the related evolution of the host galaxy. In this work, we include objects with very low Eddington ratio (10^{-3} - 10^{-2}) in an evolution scenario, and compare the results with the observed local distribution of black holes. We test several possibilities for the AGN population, considering obscuration and dependence with luminosity, and investigate the role of the Eddington ratio and radiative accretion efficiency on the shape of the evolved mass function. We find that three distinct populations of AGN can evolve with a wider parameter range than is usually considered, and still be consistent with the local mass function. In general, the black holes in our solutions are spinning rapidly. Taking fixed values for accretion efficiency and Eddington ratio neither provides a full knowledge of the evolution mechanism nor is consistent with the existence of low Eddington ratio objects.

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。

↑