Updated galactic radio constraints on Dark Matter

TL;DR

This paper analyzes synchrotron signals from Dark Matter interactions in the galaxy, using radio and microwave data to set constraints on Dark Matter properties, especially for leptonic channels.

Contribution

It provides updated constraints on Dark Matter from radio and microwave observations, considering various propagation and astrophysical models.

Findings

Radio and microwave data impose significant constraints on Dark Matter annihilation and decay.

Progressive constraints are more restrictive due to astrophysical emission modeling.

Constraints are especially strong for leptonic annihilation channels.

Abstract

We perform a detailed analysis of the synchrotron signals produced by Dark Matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and Dark Matter properties. We then confront these signals with radio and microwave maps, including Planck measurements, from a frequency of 22 MHz up to 70 GHz. We derive two sets of constraints: conservative and progressive, the latter based on a modeling of the astrophysical emission. Radio and microwave constraints are complementary to those obtained with other indirect detection methods, especially for dark matter annihilating into leptonic channels.