BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-9523
DTSTART:20260918T203000Z
DTEND:20260918T213000Z
DTSTAMP:20260828T223210Z
LAST-MODIFIED:20260824T144741Z
LOCATION:Chamberlin 2241
SUMMARY:Exploring the Extreme Universe with Gamma-ray Observatories \,
  Physics Department Colloquium\, Reshimi Mukherjee\, Columbia/Barnard 
 College
DESCRIPTION:Very-high-energy (VHE) gamma-ray astrophysics has emerged 
 as an exciting and vital field\, with major discoveries made through e
 xperiments in space and on the ground. In space\, the Fermi gamma-ray 
 telescope studies some of the most violent processes in the Universe\,
  and explores nature's highest energy accelerators. At even higher ene
 rgies\, gamma-ray astronomy can be carried out using ground-based tele
 scopes\, which detect the flashes of blue light from air-showers cause
 d by gamma rays impacting the upper atmosphere. Some of the most excit
 ing sources detected at very high energies are blazars\, with relativi
 stic jets\, and Galactic sources including supernova remnants\, pulsar
  wind nebulae\, and binary systems. Gamma-ray production in all these 
 sources occurs due to particle acceleration in extreme conditions of g
 ravitational or magnetic fields\, implying the existence of shocks and
  cataclysmic explosions. Gamma-ray astronomy works synergistically wit
 h the study of ultra high energy cosmic rays and observation of the Un
 iverse with the elusive high-energy neutrino. Multi-messenger astronom
 y has emerged as one of the most effective ways to observe the Univers
 e.  
\n
\nThis talk will outline the scientific motivation for high en
 ergy gamma-ray astronomy\, describe the techniques involved\, and surv
 ey the astrophysics of the extreme Universe\, as revealed by observati
 ons made with gamma rays\, in particular with the VERITAS observatory 
 in southern Arizona. In addition\, the talk will cover future prospect
 s and new directions with the GRAMS project\, next-generation mission 
 for gamma-ray and antimatter studies using a liquid Argon (LAr) Time P
 rojection Chamber (TPC)\, that will provide unprecedented sensitivity 
 to gamma rays in the under-explored “MeV-gap” region in high energ
 y astrophysics. 
\n
URL:https://www.physics.wisc.edu/events/?id=9523
END:VEVENT
END:VCALENDAR