SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 115: Gamma Astronomy V

T 115.2: Vortrag

Donnerstag, 23. März 2023, 16:05–16:20, POT/0151

Potential for detection of M31-like gamma-ray halos with CTA and Fermi-LAT — •Mario Engelmann, Alison Mitchell, and Katrin Streil — Erlangen Centre for Astroparticle Physics Nikolaus-Fiebiger-Str. 2 D-91058 Erlangen Germany

Recent evidence from the Fermi LAT satellite suggests that a gamma-ray halo exits around the Andromeda Galaxy. One explanation for the gamma-ray emission is, that in the inner region of the galaxy, buoyant bubbles of gas are created. These bubbles are pushed outwards and create a cosmic ray Halo around the galaxy. Consequently, the gamma rays are produced via proton-proton interaction of cosmic rays or inverse Compton scattering of cosmic ray electrons with the microwave background photons.

The sensitivity of the Fermi LAT satellite isn't sufficient to observe the whole spectrum in the GeV range. For this reason, observations with CTA can be used to search for emission at higher energies. With this information, the parameters for the spectrum can be fine-tuned. After this, potential candidate galaxies for similar halos will be chosen from the nearby galactic catalogue (maximum distance at 25 Mpc). In this contribution I will compare the sensitivity of CTA and Fermi-LAT to the gamma-ray emission from galaxies similar to the Andromeda galaxy.