High Energy Physics Seminars

Study of Astrophysical Jets using Gamma-ray Observations

by Dr. Amit Shukla (IIT, Indore)

Thursday, December 1, 2022 from to (Asia/Kolkata)
at TIFR, Mumbai ( D-406 )
Blazars and gamma-ray bursts are ideal laboratories for studying astrophysical jets, since the dominant part of their observed non-thermal emission originates close to the central engine. The flux and spectral variability can shed light on the innermost region of jets from their launching sites. I will discuss some unique observations of blazars at gamma-ray energies, such as detecting the hardest gamma-ray spectrum, a narrow feature (‘bump’) at ~3 TeV, and orphan flares from blazars at gamma-rays along with multi-waveband data. These observations shed light on the underlying mechanism producing radiation. In addition to blazar studies, I will report recent advancements in detecting gamma-ray afterglow at GeV energies from GRBs. The recently observed GRB produced from the compact binary merger (black-hole Neutron-star or Neutron-star Neutron-star) was expected to produce extended GeV emission up to 20 ks (5-6 hrs) from the trigger time. I will also discuss follow-up strategies for detecting the electromagnetic counterpart of compact binary mergers using upcoming Indian VHE telescopes such as SiPM-TIFR and MACE.