Supermassive black holes and their environments

被引:30
作者
Colberg, Joerg M. [1 ,2 ]
Di Matteo, Tiziana [1 ]
机构
[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[2] Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA
基金
美国国家科学基金会;
关键词
methods : N-body simulations; cosmology : theory; dark matter; large-scale structure of Universe;
D O I
10.1111/j.1365-2966.2008.13316.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We make use of the first high-resolution hydrodynamic simulations of structure formation which self-consistently follows the build-up of supermassive black holes (BHs) introduced in Di Matteo et al. to investigate the relation between BHs, host halo and large-scale environment. There are well-defined relations between halo and BH masses and between the activities of galactic nuclei and halo masses at low redshifts. A large fraction of BHs forms anti-hierarchically, with a higher ratio of BH to halo mass at high than at low redshifts. At z = 1, we predict group environments (regions of enhanced local density) to contain the highest mass and most active (albeit with a large scatter) BHs while the rest of the BH population to be spread over all densities from groups to filaments and voids. Density dependencies are more pronounced at high rather than low redshift. These results are consistent with the idea that gas rich mergers are likely the main regulator of quasar activity. We find star formation to be a somewhat stronger and tighter function of local density than BH activity, indicating some difference in the triggering of the latter versus the former. There exist a large number of low-mass BHs, growing slowly predominantly through accretion, which extends all the way into the most underdense regions, that is, in voids.
引用
收藏
页码:1163 / 1178
页数:16
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