Overview of feebly interacting particle in indirect detection searches

Axion-like particles (ALPs) as feebly interacting particles (FIPs) candidate have generated a lot of interest in the recent years. Stars are good FIPs factories and consequently those particle can be detected through their interaction with the interstellar medium or decay in standard particles. Briefly, I will illustrate how high-energy astrophysics observations can be exploited to set constraints to ALPs model and to the ASTRO-MeV gap problem.