High Energy Physics Seminars

Probing Cosmic Rays with Cherenkov Telescopes

by Dr. Atreyee Sinha ((Universidad Complutense de Madrid, Spain))

Wednesday, April 3, 2024 from to (Asia/Kolkata)
at TIFR, Mumbai ( D-406 )
The development of a novel 3D field of likelihood analysis technique for Cherenkov Telescopes, as implemented in Gammapy, has allowed the study of hitherto unresolved sources. This is especially important for crowded regions in the galactic plane.
In the first part of this talk, we will report on a few such novel studies using the H.E.S.S. telescope array, especially the discovery of a new pulsar wind nebula candidate (PSR J1413-6205), and the first detection of a passive molecular cloud at very high energies. The detection of one of the faintest supernovas (G312.04) at GeV energies using Fermi-LAT will also be discussed. A study of these sources allows us to probe acceleration, diffusion, and escape of cosmic rays in our galaxy.
In the latter part of the talk, we will focus on variability studies of extragalactic sources, i.e., blazars, which can be useful targets for the MACE Telescope. Despite decades of research, variability patterns in blazars are poorly understood, and the observed lognormal flux distributions in their high-energy emissions have added to the debate. We will discuss two mechanisms of generating log-normal trends and their observational evidence.