Two channels of supermassive black hole growth as seen on the galaxies mass–size plane
Two channels of supermassive black hole growth as seen on the galaxies mass–size plane
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DOI：
10.1093/mnras/stx2704
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发表时间：
2017-07
影响因子：
4.8
通讯作者：
D. Krajnovi'c;M. Cappellari;R. McDermid
中科院分区：
文献类型：
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作者：
D. Krajnovi'c;M. Cappellari;R. McDermid
我们研究了黑洞质量（Mbh）随宿主星系恒星质量（Mstar）和半光半径（Re）的变化。我们证实，在这个平面内的Mbh的散射基本上是相同的，在Mbh -σ关系，从维里质量估计sigma_v^2=GxMstar/（5xRe）中报告的可忽略的散射预期。Mbh的所有变化都是沿着（Mstar，Re）平面上的恒定sigma_v的沿着发生的，或者对于Mstar Mcrit，沿着Mstar $\propto$ Re。这与大多数星系通过星星形成而成长的情况是一致的，而最大质量的星系则经历了一系列无耗散的合并。在这两个通道中，黑洞和星系同步增长，产生了黑洞-宿主星系标度关系，但没有一个潜在的单一关系在整个星系质量范围内是普遍的。
We investigate the variation of black hole masses (Mbh) as a function of their host galaxy stellar mass (Mstar) and half-light radius (Re). We confirm that the scatter in Mbh within this plane is essentially the same as that in the Mbh - sigma relation, as expected from the negligible scatter reported in the virial mass estimator sigma_v^2=GxMstar/(5xRe). All variation in Mbh happens along lines of constant sigma_v on the (Mstar, Re) plane, or Mstar $\propto$ Re for Mstar Mcrit. This is consistent with the scenario where the majority of galaxies grow through star formation, while the most massive galaxies undergo a sequence of dissipation-less mergers. In both channels black holes and galaxies grow synchronously, giving rise to the black hole - host galaxy scaling relations, but there is no underlying single relation that is universal across the full range of galaxy masses.