Abstract
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.
Published in:
Astrophysical Journal 599,2 (2003) 909-917;
Keywords
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 Version
January 2003
Recommended Citation
Perez, I. D.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Celik, O.; Cui, W.; Dowdall, C.; Duke, C.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L.; Gaidos, J. A.; Gibbs, K.; Gammell, S.; Hall, J.; Hall, T. A.; Hillas, A. M.; Holder, J.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; LeBohec, S.; Linton, E. T.; Lloyd-Evans, J.; Moriarty, P.; Muller, D.; Nagai, T. N.; Ong, R. A.; Page, M.; Pallassini, R.; Petry, D.; Power-Mooney, B.; Quinn, J.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; and Weekes, T. C., "Search for high-energy gamma rays from an X-ray-selected blazar sample" (2003). Department of Physics and Astronomy Faculty Publications. Paper 379.
https://docs.lib.purdue.edu/physics_articles/379