SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 144: Cosmic Ray VII
T 144.4: Talk
Thursday, March 23, 2023, 18:15–18:30, POT/0013
Cosmic-ray signatures in dwarf galaxies: astrophysical foreground and dark-matter background* — •Athithya Aravinthan1,2, Lukas Merten1,2, Julia Becker Tjus1,2, and Jurek Völp1,2 — 1Theoretische Physik IV, Ruhr-Universität Bochum, Bochum, Germany — 2RAPP-Center, Ruhr-Universität Bochum, Bochum, Germany
Dwarf galaxies are a convenient testing ground in the search for Dark Matter (DM), owing to their low, astrophysical background in the radio and gamma-ray energies. Studying the multimessenger signatures of dwarf galaxies can lead to a more precise astrophysical background for DM searches, thereby improving the current limits on indirect DM detection. This motivates the study of nearby starburst galaxies like IC10, which produces non-thermal radio emission coupled to complex Cosmic Ray (CR) propagation.
The goal of this work is to understand the role of CRs in low-mass dwarf galaxies by modelling their propagation using the open-source tool CRPropa 3.2. First test results, starting with a general propagation environment in CRPropa, are pursued in a generic starforming-type magnetic field for IC10, and will later be modified for other low-mass galaxies. For the first time, the modelling is done in combination with astrophysical data on magnetic field structure and gas densities with the goal of pursuing a coherent understanding of the outflow produced in dwarf galaxies. *Supported by DFG (SFB 1491).