Dark Matter Annihilation around Intermediate Mass Black Holes: an update

Understand

The formation and evolution of Black Holes inevitably affects the distribution of dark and baryonic matter in the neighborhood of the Black Hole.

• These effects may be particularly relevant around Supermassive and Intermediate Mass Black Holes (IMBHs), the formation of which can lead to large Dark Matter overdensities, called {\em spikes} and {\em mini-spikes} respectively.
• Despite being larger and more dense, spikes evolve at the very centers of galactic halos, in regions where numerous dynamical effects tend to destroy them.
• Mini-spikes may be more likely to survive, and they have been proposed as worthwhile targets for indirect Dark Matter searches.