Detection of T[CLC]e[/CLC]V Gamma Rays from the BL Lacertae Object 1ES 1959+650 with the Whipple 10 Meter Telescope
J. HolderDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKI. H. BondDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKP. J. BoyleEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637S. M. BradburyDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKJ. H. BuckleyDepartment of Physics, Washington University, St. Louis, MO 63130D. A. Carter‐LewisDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011Wei CuiDepartment of Physics, Purdue University, West Lafayette, IN 47907C. DowdallSchool of Science, Galway-Mayo Institute of Technology, Galway, IrelandC. DukeDepartment of Physics, Grinnell College, P.O. Box 805, Grinnell, IA 50112I. de la Calle PerezDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKA. FalconeDepartment of Physics, Purdue University, West Lafayette, IN 47907D. J. FeganDepartment of Physics, National University of Ireland, Belfield, Dublin 4, IrelandS. FeganDepartment of Physics, University of Arizona, Tucson, AZ 85721J. P. FinleyDepartment of Physics, Purdue University, West Lafayette, IN 47907L. FortsonEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637J. A. GaidosDepartment of Physics, Purdue University, West Lafayette, IN 47907K. GibbsFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645S. GammellDepartment of Physics, National University of Ireland, Belfield, Dublin 4, IrelandJ. HallHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112T. A. HallDepartment of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, AR 72204A. M. HillasDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKD. HoranFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645M. JordanDepartment of Physics, Washington University, St. Louis, MO 63130M. KertzmanDepartment of Physics, De Pauw University, Greencastle, IN 46135D. KiedaHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112J. KildeaDepartment of Physics, National University of Ireland, Belfield, Dublin 4, IrelandJ. KnappDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKK. KosackDepartment of Physics, Washington University, St. Louis, MO 63130H. KrawczynskiDepartment of Physics, Washington University, St. Louis, MO 63130F. KrennrichDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011S. LeBohecDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011E. LintonEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637J. Lloyd‐EvansDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKP. MoriartySchool of Science, Galway-Mayo Institute of Technology, Galway, IrelandD. MüllerEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637T. NagaiHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112R. A. OngDepartment of Physics, University of California at Los Angeles, Los Angeles, CA 90095K. L. PageDepartment of Physics, Grinnell College, P.O. Box 805, Grinnell, IA 50112R. PallassiniDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKD. PetryDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011B. Power‐MooneyDepartment of Physics, National University of Ireland, Belfield, Dublin 4, IrelandJ. QuinnDepartment of Physics, National University of Ireland, Belfield, Dublin 4, IrelandP. RebillotDepartment of Physics, Washington University, St. Louis, MO 63130P. T. ReynoldsDepartment of Physics, Cork Institute of Technology, Cork, IrelandH. J. RoseDepartment of Physics, University of Leeds, Leeds LS2 9JT Yorkshire, England, UKM. SchroedterDepartment of Physics, University of Arizona, Tucson, AZ 85721G. H. SembroskiDepartment of Physics, Purdue University, West Lafayette, IN 47907S. P. SwordyEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637V. V. VassilievHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112S. P. WakelyEnrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637Gary WalkerHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112T. C. WeekesFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645
2003en
ABI
Аннотация
We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray-selected BL Lacertae object 1ES 1959+650. Observations were made with the Whipple 10 m telescope on Mount Hopkins, Arizona, using the atmospheric Cerenkov imaging technique. The flux between 2002 May and July was highly variable, with a mean of 0.64+/-0.03 times the steady flux from the Crab Nebula and reaching a maximum of 5 crab, with variability on timescales as short as 7 hr.
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