Published in:

Astrophysical Journal 599,2 (2003) 909-917;


Our understanding of blazars has been greatly increased in recent years by extensive multiwavelength observations, particularly in the radio, X-ray, and gamma-ray regions. Over the past decade the Whipple 10 m telescope has contributed to this with the detection of five BL Lacertae objects at very high gamma-ray energies. The combination of multiwavelength data has shown that blazars follow a well-defined sequence in terms of their broadband spectral properties. Together with providing constraints on emission models, this information has yielded a means by which potential sources of TeV emission may be identified and predictions made as to their possible gamma-ray flux. We have used the Whipple telescope to search for TeV gamma-ray emission from eight objects selected from a list of such candidates. No evidence has been found for very high energy emission from the objects in our sample, and upper limits have been derived for the mean gamma-ray flux above 390 GeV. These flux upper limits are compared with the model predictions, and the implications of our results for future observations are discussed.


bl lacertae objects : individual (rgb j0214+517, rgb j1117+202, rgb j1725+118, ies 0033+595, 1es 0120+340;; 1es 0229+200, 1es 0806+524, 1es 1426+428, 1es 1553+113, 1es 1959+650);; gamma rays : observations;; active galactic nuclei;; bl lacertae objects;; tev energies;; emission;; radiation;; telescope;; flare;; markarian-501;; absorption;; discovery

Date of this Version

January 2003



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