Physics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.2302w&link_type=abstract
American Astronomical Society, HEAD meeting #7, #23.02; Bulletin of the American Astronomical Society, Vol. 35, p.645
Physics
Scientific paper
Blazars are well-established sources of TeV emission. The spectral energy distributions have been measured up to tens of TeV. First generation ground based Cerenkov telescopes have identified several sources, determined variability and spectral characteristics, and put the gamma-ray properties into a consistent multifrequency picture of Blazar characteristics. A number of of important questions have been raised. What are the primary particle acceleration mechanisms, and how are they connected to the MHD jet configurations. What is the precise location of high energy gamma-ray emission? What are the similarities and differences between Blazar and GRB emission models? Most of these questions and further problems can best be understood in a multifrequency approach. This is particularly important when intrinsic gamma-ray characteristics are coupled to propagation-induced extinction of the gamma-ray radiation on the IR background.
In this presentation I will review the TeV characteristics of Blazars from the first ten years, performed by the first generation facilities of ground-based Cerenkov telescopes. Several very successful multiwavelength campaign have been carried out. Some of the important open questions are discussed in the light of capabilities of the new facilities. Multifrequency studies will be fundamental in future observing programs, and I will describe some of the crucial tests for our current models of Blazar emission.
This research is supported through the German ministry for research (BMBF) through a grant of the astroparticle physics program of the DLR (05 CH2VOA/2).
E. S. S Collaboration H.
Wagner Stefan J.
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