Very high energy observations of the BL Lac objects 3C 66A and OJ 287

Details Very high energy observations of the BL Lac objects 3C 66A and OJ 287 Very high energy observations of the BL Lac objects 3C 66A and OJ 287

2007-07-18

arxiv.org/abs/0707.2815v1

Astropart.Phys.28:338-347,2007

Astronomy and Astrophysics

Astrophysics

24 pages, 15 figures, Accepted for publication in Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2007.07.

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 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. 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.

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