3 years ago

Enhancement of the tidal disruption event rate in galaxies with a nuclear star cluster: from dwarfs to ellipticals. (arXiv:2003.08133v1 [astro-ph.GA])

Hugo Pfister, Marta Volonteri, Jane Lixin Dai, Monica Colpi
We compute the tidal disruption event (TDE) rate around local massive black holes (MBHs) with masses as low as , thus probing the dwarf regime for the first time. We select a sample of 37 galaxies for which we have the surface stellar density profile, a dynamical estimate of the mass of the MBH, and 6 of which, including our Milky Way, have a resolved nuclear star cluster (NSC). For the Milky Way, we find a total TDE rate of when taking the NSC in account, and otherwise. TDEs are mainly sourced from the NSC for light ( ) galaxies, with a rate of few , and an enhancement of up to 2 orders of magnitude compared to non-nucleated galaxies. We create a mock population of galaxies using different sets of scaling relations to explore trends with galaxy mass, taking into account the nucleated fraction of galaxies. Overall, we find a rate of few which drops when galaxies are more massive than and contain MBHs swallowing stars whole and resulting in no observed TDE.

Publisher URL: http://arxiv.org/abs/2003.08133

DOI: arXiv:2003.08133v1

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