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Speaker

Henric Krawczynski

Washington University in St. Louis
Physics
314 935 8553
krawcz@wuphys.wustl.edu
TeV Gamma-Rays from the Collimated Outflows of Mass-Accreting Black Holes
Most probably, almost every galaxy harbors a supermassive black hole at its center. Some of these black holes are sources of gigantic collimated plasma outflows, so-called jets. At the bases of these jets very near the supermassive black holes violent processes can result in the emission of high energy gamma-rays. I will report on observations of such gamma-rays with the Whipple/VERITAS and the HEGRA Cherenkov telescopes. The gamma-ray observations can be used to constrain the astrophysics of the jets and to probe the transparency of the universe to high energy gamma-rays. The latter contains ``calorimetric information'' on the total amount of electromagnetic energy produced in our universe since the decoupling of radiation and matter.
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