TeV Gamma-Ray Observations of Southern Hemisphere BL Lacertae Objects with CANGAROO-II/III Telescope

摘要

Since 1999,several BL Lac objects,such as PKS 2155-304(z=0.116)and PKS 2005-489(z=0.072)have been observed with the CANGAROO-II imaging atmospheric Cherenkov telescope.We obtained flux upper limits for these objects.Here we present the results of our observations of these objects,particularly those observed since 2000,and discuss the implications for the emission models and the absorption by the extra-galactic infrared background.