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Searches for very high energy gamma rays from blazars with CANGAROO-III telescope in 2005-2009 |
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| Authors: | Y Mizumura J Kushida K Nishijima GV BicknellRW Clay PG EdwardsS Gunji S HaraS Hayashi S KabukiF Kajino A KawachiT Kifune R KiuchiK Kodani Y MatsubaraT Mizukami Y MizumotoM Mori H MuraishiT Naito M OhishiV Stamatescu DL SwabyT Tanimori G ThorntonF Tokanai T ToyamaS Yanagita T YoshidaT Yoshikoshi |
| Institution: | a Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan b Research School of Astronomy and Astrophysics, Australian National University, ACT 2611, Australia c School of Chemistry and Physics, University of Adelaide, SA 5005, Australia d Australia Telescope National Facility, CSIRO, Epping, NSW 2121, Australia e Department of Physics, Yamagata University, Yamagata 990-8560, Japan f Faculty of Management Information, Yamanashi Gakuin University, Kofu, Yamanashi 400-8575, Japan g Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan h Department of Radiation Oncology, Tokai University, Isehara, Kanagawa 259-1193, Japan i Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan j Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan k Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8602, Japan l Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan m National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan n Department of Physics, College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan o School of Allied Health Sciences, Kitasato University, Sagamihara, Kanagawa 228-8555, Japan p Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan |
| 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. |
| Keywords: | VHE gamma rays Observations IACTs BL Lacs FSRQs |
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