Conveners
Astroparticle & Other High-Energy Sources
- Michael Backes (University of Namibia)
High-energy gamma rays are one of the most promising tools to constrain or reveal the nature of Dark Matter (DM). During the almost two decades of the Fermi satellite mission, the data from its Large Area Telescope (LAT) were used to set constraints on Weakly Interacting Massive Particles (WIMP) and Axion -Like-Particle (ALP) models as well as to perform various searches for new physics. As...
In this work, we aim to compute the radio flux from the decay of axions close to Saggitarius A*, the supermassive black hole at the center of our galaxy. These particles can undergo stimulated decay in the presence of photons with energies of half the axion mass. We make use of an observed spectrum for Sgr A emission in the frequency range of SKA and the VLBA, to find the effect of stimulated...
The fundamental nature of dark matter (DM), which constitutes a significant fraction of the universe's mass-energy budget, remains one of the foremost challenges in modern astrophysics and particle physics. Due to their weak interactions and cosmological origins, high-energy neutrinos serve as sensitive probes for potential neutrino-DM scattering processes. Specifically, dense accumulations of...
In 2010, the Fermi Gamma-ray Space Telescope observed two gamma-ray emitting structures, the Fermi Bubbles (FBs), that extend up to 55° above and below the Galactic plane and that seem to emanate from the Galactic center region. Although the spectrum at latitudes |b| > 10° has a softening or a cutoff around 100 GeV, the one at the base of the FBs, |b| <10°, extends up to about 1 TeV without a...
We present a comprehensive phase-resolved photometric, spectroscopic, and polarimetric analysis of the intermediate polar (IP) 1RXS J080114.6–462324, based on multi-instrument observations. These include data from the HIgh-speed Photo-POlarimeter (HIPPO), the Southern African Large Telescope (SALT), and the SAAO 1.0-m and 1.9-m telescopes, complemented by archival photometry from the...
