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Title:
High-Energy Gamma-Ray Observations of W Comae with the Solar Tower Atmospheric Cerenkov Effect Experiment (STACEE)
Authors:
Scalzo, R. A.; Boone, L. M.; Bramel, D.; Carson, J.; Covault, C. E.; Fortin, P.; Gauthier, G.; Gingrich, D. M.; Hanna, D.; Jarvis, A.; Kildea, J.; Lindner, T.; Mueller, C.; Mukherjee, R.; Ong, R. A.; Ragan, K. J.; Williams, D. A.; Zweerink, J.
Affiliation:
AA(Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637.; Current address: Lawrence Berkeley National Laboratory, MS 50R5008, 1 Cyclotron Road, Berkeley, CA 94720.), AB(Santa Cruz Institute for Particle Physics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.; Current address: Department of Physics, College of Wooster, Wooster, OH 44691.), AC(Department of Physics and Astronomy, Barnard College and Columbia University, New York, NY 10027.), AD(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.), AE(Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106.), AF(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AG(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AH(Centre for Subatomic Research, University of Alberta, Edmonton, AB T6G 2N5, Canada.; Tri-Universities Meson Facility, Vancouver, BC V6T 2A3, Canada.), AI(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AJ(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.), AK(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AL(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AM(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AN(Department of Physics and Astronomy, Barnard College and Columbia University, New York, NY 10027.), AO(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.), AP(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AQ(Santa Cruz Institute for Particle Physics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AR(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.)
Publication:
The Astrophysical Journal, Volume 607, Issue 2, pp. 778-787. (ApJ Homepage)
Publication Date:
06/2004
Origin:
UCP
ApJ Keywords:
BL Lacertae objects: individual (W Com), Galaxies: Active, Gamma Rays: Observations
DOI:
10.1086/383534
Bibliographic Code:
2004ApJ...607..778S

Abstract

We report on observations of the blazar W Com (ON+231) with the Solar Tower Atmospheric Cerenkov Effect Experiment (STACEE), a wave front-sampling atmospheric Cerenkov telescope, in the spring of 2003. In a data set comprising 10.5 hr of on-source observing time, we detect no significant emission from W Com. We discuss the implications of our results in the context of the composition of the relativistic jet in W Com, 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)×10-10 cm-2 s-1 above 100 GeV for the leptonic models, or (0.5-1.1)×10-10 cm-2 s-1 above 150 GeV for the hadronic models.
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