Multiwavelength Observations of TeV Blazars

Physics

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Scientific paper

The blazar-type active galactic nuclei (AGN) Mrk 421 and Mrk 501 are the only two confirmed extragalactic sources of very high energy (VHE, E>250 GeV) gamma rays known at this time. Their VHE emission varies by as much as a factor of 100 and as fast as 15 minutes. The spectra of these objects extend up to energies of at least 20 TeV. Because of their extreme behavior, several intense observation campaigns on these objects have been conducted in the last several years using telescopes covering radio to gamma-ray frequencies. The results of these observations constrain models which attempt to explain the emission from these types of AGN. We will present recent multiwavelength observations of Mrk 421 and Mrk 501 and their implications on our understanding of the environment near these AGN and the mechanisms which may produce the VHE gamma rays. The VHE data presented here were taken with the Whipple Observatory 10m gamma-ray telescope located on Mt. Hopkins near Tucson, AZ.

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