The growth of supermassive black holes in pseudo-bulges, classical bulges and elliptical galaxies
The growth of supermassive black holes in pseudo-bulges, classical bulges and elliptical galaxies
复制标题
DOI：
10.1111/j.1365-2966.2009.15328.x
复制
发表时间：
2008-11
影响因子：
4.8
通讯作者：
D. Gadotti;G. Kauffmann
中科院分区：
文献类型：
--
作者：
D. Gadotti;G. Kauffmann
利用斯隆数字巡天近1000个本星系样本的结构分析结果，估计了中心黑洞质量在椭圆星系、经典凸起和伪凸起之间的分布，并研究了它们的恒星质量与恒星质量之间的关系。中心恒星速度色散σ。假设椭圆星系/核球质量M Bulge和中心黑洞质量M BH之间存在单一关系，我们发现，在局域宇宙中，黑洞质量的55 + 8 - 4%位于椭圆星系的中心，41 + 4 - 2%位于经典核球，4 + 0 - 9 - 0. 4%位于伪核球。我们发现椭圆星系、经典星系球和伪星系球的恒星质量与σ之间存在着不同的关系，而在棒星系中，伪星系球的质量与σ之间存在着最显著的偏移。这种结构上的不相似性导致了采用单个MBH-M Bulge和MBH-σ关系时黑洞质量的不一致性。采用文献中的关系，我们发现MBH-σ关系产生的黑洞总质量密度的估计值比使用MBH-M Bulge关系时大约大55%。
Using results from structural analysis of a sample of nearly 1000 local galaxies from the Sloan Digital Sky Survey, we estimate how the mass in central black holes is distributed amongst elliptical galaxies, classical bulges and pseudo-bulges, and investigate the relation between their stellar masses and central stellar velocity dispersion σ. Assuming a single relation between elliptical galaxy/bulge mass, M Bulge , and central black hole mass, M BH , we find that 55 +8 -4 per cent of the mass in black holes in the local universe is in the centres of elliptical galaxies, 41 +4 - 2 per cent in classical bulges and 4 +0-9 -0.4 per cent in pseudo-bulges. We find that ellipticals, classical bulges and pseudo-bulges follow different relations between their stellar masses and σ, and the most significant offset occurs for pseudo-bulges in barred galaxies. This structural dissimilarity leads to discrepant black hole masses if single M BH -M Bulge and M BH -σ relations are used. Adopting relations from the literature, we find that the M BH -σ relation yields an estimate of the total mass density in black holes that is roughly 55 per cent larger than if the M BH -M Bulge relation is used.