Interstellar gas heating by primordial black holes

Interstellar gas heating is a powerful cosmology-independent observable for exploring the parameter space of primordial black holes (PBHs) formed in the early Universe that could constitute part of the dark matter (DM). We provide a detailed analysis of the various aspects for this observable, such as PBH emission mechanisms. Using observational data from the Leo T dwarf galaxy, we constrain the PBH abundance over a broad mass-range, M-PBH similar to O(1)M-circle dot - 10(7) M-circle dot, relevant for the recently detected gravitational wave signals from intermediate-mass BHs. We also consider PBH gas heating of systems with bulk relative velocity with respect to the DM, such as Galactic clouds.

Automated summary

This study provides a detailed analysis on the various aspects of interstellar gas heating, including PBH emission mechanisms and constraints on the PBH abundance for different mass ranges. Observational data from the Leo T dwarf galaxy is used to constrain the PBH abundance relevant to intermediate-mass BHs. The study also considers PBH gas heating in systems with bulk relative velocity to the DM.