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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2319
DTSTART:20120302T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T075522Z
LAST-MODIFIED:20120214T195239Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Particle Astrophysics with Space- and Ground-Based Telescopes\
 , Physics Department Colloquium\, Reshmi Mukherjee\, Barnard College &
  Columbia University
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\, at energies above 10
 0 MeV\, the Fermi satellite studies some of the most violent processes
  in the Universe\, and explores nature's highest energy accelerators. 
 At energies greater than about 100 GeV\, gamma-ray astronomy can be ca
 rried out using ground-based telescopes\, such as the VERITAS Observat
 ory\, which detects the Cherenkov light from air-showers initiated by 
 gamma rays impacting the upper atmosphere. VERITAS has discovered many
  astrophysical sources of VHE gamma rays. Some of the most exciting so
 urces detected are blazars\, with highly variable fluxes. The combinat
 ion of high luminosities and time variations seen in the data indicate
 s that gamma-rays are an important component of the relativistic jet t
 hought to characterize blazars. This talk will outline the scientific 
 motivation for VHE gamma-ray astronomy\, describe the techniques invol
 ved\, and survey the astrophysics of the extreme Universe\, as reveale
 d by observations made with gamma rays.
URL:https://www.physics.wisc.edu/events/?id=2319
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