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High-Energy Gamma-Ray Observations of W Comae with STACEE

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arxiv astro-ph/0403114 v1 pith:RIUZ7YTW submitted 2004-03-04 astro-ph

High-Energy Gamma-Ray Observations of W Comae with STACEE

classification astro-ph
keywords comaemodelsaboveatmosphericcherenkovhadronicleptoniclevel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on observations of the blazar W Comae (ON+231) with the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE), a wavefront-sampling atmospheric Cherenkov telescope, in the spring of 2003. In a data set comprising 10.5 hours of ON-source observing time, we detect no significant emission from W Comae. We discuss the implications of our results in the context of the composition of the relativistic jet in W Comae, examining both leptonic and hadronic models for the jet. We derive 95% confidence level upper limits on the flux at the level of 1.5--3.5 x 10^{-10} cm^{-2} s^{-1} above 100 GeV for the leptonic models, or 0.5--1.1 x 10^{-10} cm^{-2} s^{-1} above 150 GeV for the hadronic models.

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