Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3005k&link_type=abstract
American Astronomical Society, HEAD meeting #11, #30.05; Bulletin of the American Astronomical Society, Vol. 41, p.701
Astronomy and Astrophysics
Astronomy
Scientific paper
VERITAS is an experiment of four 12 meter diameter Cherenkov Telescopes located at the foot of Mt. Hopkins in Arizona. The VERITAS experiment has been used to study the >100 GeV gamma-ray emission from a large number of blazars. In this talk, an overview of the VERITAS blazar results will be given. The most interesting results come from two types of observations: (a) intensive multiwavelength observations (including gamma-ray observations with VERITAS and the space-borne Fermi LAT pair telescope) of very bright sources, like Mrk 421 and Mrk 501, and (b) the discovery of new sources and new source classes. The multiwavelength observations of high frequency peaked blazars lend support to simple synchrotron-Compton models - however, the sources show rather erratic behavior with regards to the X-ray to TeV flux correlation and the spectral evolution at X-rays and at gamma-rays. Model fits to the broadband spectral energy distributions of intermediate and low frequency peaked blazars are tightly constrained. Indeed, the modeling favors external Compton models over synchrotron self-Compton models. After presenting observational data and the theoretical implications, possible avenues for achieving progress in this field are discussed.
Krawczynski Henric
VERITAS Collaboration
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