Author/Authors :
Lindner، نويسنده , , T. and Hanna، نويسنده , , D.S. and Kildea، نويسنده , , J. and Ball، نويسنده , , J. and Bramel، نويسنده , , D.A. and Carson، نويسنده , , J. and Covault، نويسنده , , C.E. and Driscoll، نويسنده , , D. and Fortin، نويسنده , , P. and Gingrich، نويسنده , , D.M. and Jarvis، نويسنده , , A. and Mueller، نويسنده , , C. and Mukherjee، نويسنده , , R. G. Ong Che، نويسنده , , R.A. and Ragan، نويسنده , , K. and Scalzo، نويسنده , , R.A. and Williams، نويسنده , , D.A. and Zweerink، نويسنده , , J.، نويسنده ,
Abstract :
Using the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE), we have observed the BL Lac objects 3C 66A and OJ 287. These are members of the class of low-frequency-peaked BL Lac objects (LBLs) and are two of the three LBLs predicted by Costamante and Ghisellini [L. Costamante, G. Ghisellini, Astron. Astrophys. 384 (2002) 56] to be potential sources of very high energy (>100 GeV) gamma-ray emission. The third candidate, BL Lacertae, has recently been detected by the MAGIC collaboration [J. Albert et al., arXiv:astro-ph/0703084v1 (2007)]. Our observations have not produced detections; we calculate a 99% CL upper limit of flux from 3C 66A of 0.15 Crab flux units and from OJ 287 our limit is 0.52 Crab. These limits assume a Crab-like energy spectrum with an effective energy threshold of 185 GeV.
