Ponente
Descripción
The Dark Matter (DM) distribution within a few kpc of the center of galaxies is essential for indirect detection searches and probing the particle nature of DM. Below the kpc scale, we examine external galaxies where adiabatically growing black holes lead to the formation highly dense DM region dubbed the DM spike. These spikes may lie within galaxy radio jets, such as M87, where minimal coupling between DM and the standard model can significantly impact the electron distribution. Observations from the KVN and VERA Array (KaVA) and the Very Long Baseline Array (VLBA) constrain this electron distribution, enabling leading constraints on sub-GeV DM. We further model the effect of DM cooling on the electron distribution and argue that this mechanism offers a compelling explanation for the enigmatic behavior the spectral index in Radio Loud galaxies.
