McConnell et al. 2011
"Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies"
The authors report on the two new BHs found in the nearby universe, that are now the most massive BHs known to us. They explain their model which they used to infer the mass of these objects and talk about the underlying uncertainty. As a result of their high mass, they are outliers on the Mbh-sigma relation and hence, interesting to the BH-galaxy coevolution question.
"Astrophysics: Monster black holes"
The implication of the above paper on the dry-merger-driven growth scenario for BHs is explored. The author argues that the two outliers on the Mbh-sigma relation could be a result of coalescing BHs, keeping the velocity dispersion on the resultant galaxy the same, but growing the central BH to double its initial mass. A speculative yet interesting insight into the BH-galaxy coevolution.
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