Author/Authors :
Mizumura، نويسنده , , Y. and Kushida، نويسنده , , J. and Nishijima، نويسنده , , K. and Bicknell، نويسنده , , G.V. and Clay، نويسنده , , R.W. and Edwards، نويسنده , , P.G and Gunji، نويسنده , , S. and Hara، نويسنده , , S. F. Hayashi، نويسنده , , S. and Kabuki، نويسنده , , S. and Kajino، نويسنده , , F. and Kawachi، نويسنده , , A. and Kifune، نويسنده , , T. and Kiuchi، نويسنده , , R. and Kodani، نويسنده , , K. and Matsubara، نويسنده , , Y. and Mizukami، نويسنده , , T. and Mizumoto، نويسنده , , Y. and Mori، نويسنده , , M. and Muraishi، نويسنده , , H. and Naito، نويسنده , , T. and Ohishi، نويسنده , , M. and Stamatescu، نويسنده , , V. and Swaby، نويسنده , , D.L. and Tanimori، نويسنده , , T. and Thornton، نويسنده , , G. and Tokanai، نويسنده , , F. and Toyama، نويسنده , , T. and Yanagita، نويسنده , , S. and Yoshida، نويسنده , , T. and Yoshikoshi، نويسنده , , T.، نويسنده ,
Abstract :
We have searched for very high energy (VHE) gamma rays from four blazars using the CANGAROO-III imaging atmospheric Cherenkov telescope. We report the results of the observations of H 2356-309, PKS 2155-304, PKS 0537-441, and 3C 279, performed from 2005 to 2009, applying a new analysis to suppress the effects of the position dependence of Cherenkov images in the field of view. No significant VHE gamma ray emission was detected from any of the four blazars. The GeV gamma-ray spectra of these objects were obtained by analyzing Fermi/LAT archival data. Wide range (radio to VHE gamma-ray bands) spectral energy distributions (SEDs) including CANGAROO-III upper limits, GeV gamma-ray spectra, and archival data, even though they are non-simultaneous, are discussed using a one-zone synchrotron self-Compton (SSC) model in combination with a external Compton (EC) radiation. The HBLs (H 2356-309 and PKS 2155-304) can be explained by a simple SSC model, and PKS 0537-441 and 3C 279 are well modeled by a combination of SSC and EC model. We find a consistency with the blazar sequence in terms of strength of magnetic field and component size.
