astrobites | 2017 Sep 11
Eckhart Spalding wrote:
... The authors finish by offering up an interesting possible formation mechanism. This black hole is far too massive to have been generated upon the death of a massive star, but it may have formed from stellar mergers. If that’s the case, then it should take an entire dwarf galaxy to produce a black hole so massive. Given the dozens of dwarf galaxies drifting around the Milky Way in various stages of cannibalization, the authors suggest that we may be seeing the black hole remnant of a long-lost dwarf galaxy.
This means that IMBHs could represent signatures of the Milky Way’s galactic merger history which has already been erased in the kinematics of stars, and further discoveries could also indicate the likelihood that Sgr A* is itself the product of stellar mergers.
Millimetre-Wave Emission from an Intermediate-Mass Black Hole Candidate in the Milky Way - Tomoharu Oka et al
- Nature Astronomy (online 04 Sep017) DOI: 10.1038/s41550-017-0224-z
arXiv.org > astro-ph > arXiv:1707.07603 > 24 Jul 2017 (v1), 05 Sep 2017 (v2)