Abstract

Contributed Talk - Splinter NonThermalAccel   (MW-1250)

Time-Dependent Modeling of Astrophysical and DM Secondary Signatures in Dwarf Galaxies

Jannis Wagner, Julien Dörner, Athithya Aravinthan, Julia Becker Tjus
Ruhr-Universität Bochum, Ruhr Astroparticle and Plasma Physics Center, Chalmers University of Technology

Dwarf galaxies are favoured targets of indirect searches for Dark Matter (DM) due to their high mass-to-light ratios and low star-formation rates. Searches mainly focus on gamma rays in the GeV-TeV range created through different annihilation channels of Weakly Interacting Massive Particles (WIMPs). However, other annihilation products can interact further and give rise to significant radiation themselves. These signals are contaminated by radiative emission of astrophysical Cosmic Rays (CRs). Disentangling them requires joint modeling. Furthermore, the declining star-formation rate in dwarf galaxies affects the CR luminosity and the galactic magnetic field, necessitating time-dependent modeling. Such an approach would enable a more reliable characterization of the morphological differences between DM-induced and astrophysical CR secondary emission, thereby supporting future observation attempts in obtaining evidence for DM or in setting stronger constraints on its characteristics. In this talk, we explore this coupled modeling for leptonic DM secondaries and astrophysical CR electrons using the Monte-Carlo framework CRPropa. We start with a comparison of morphological differences in a synthetic steady-state galaxy. Following that, we investigate general effects of a time-dependent CR luminosity with artificially constructed luminosity evolution profiles.