Detection of the BL Lacertae Object H1426+428 at TeV Gamma‐Ray Energies
D. HoranExperimental Physics Department, National University of Ireland, Belfield, Dublin 4, IrelandH. M. BadranFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, P.O. Box 97, Amado, AZ 85645I. H. BondDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKS. M. BradburyDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKJ. H. BuckleyDepartment of Physics, Washington University, St. Louis, MO 63130M. CarsonExperimental Physics Department, National University of Ireland, Belfield, Dublin 4, IrelandD. A. Carter‐LewisDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011M. CataneseFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, P.O. Box 97, Amado, AZ 85645Wei CuiDepartment of Physics, Purdue University, West Lafayette, IN 47907S. DunleaExperimental Physics Department, National University of Ireland, Belfield, Dublin 4, IrelandD. DasDepartment of Physics, Kansas State University, Manhattan, KS 66506I. de la Calle PerezDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKM. D’ValiDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKD. J. FeganExperimental Physics Department, 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 47907J. A. GaidosDepartment of Physics, Purdue University, West Lafayette, IN 47907K. GibbsFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, P.O. Box 97, Amado, AZ 85645G. H. GillandersPhysics Department, National University of Ireland, Galway, IrelandT. A. HallDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011A. M. HillasDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKJ. HolderDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKM. JordanDepartment of Physics, Washington University, St. Louis, MO 63130M. KertzmanDepartment of Physics and Astronomy, DePauw University, Greencastle, IN 46135D. KiedaHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112J. KildeaExperimental Physics Department, 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 63130F. KrennrichDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011M. J. LangPhysics Department, National University of Ireland, Galway, IrelandS. LeBohecDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011R. W. LessardDepartment of Physics, Purdue University, West Lafayette, IN 47907J. Lloyd‐EvansDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKBarry McKernanExperimental Physics Department, National University of Ireland, Belfield, Dublin 4, IrelandP. MoriartySchool of Science, Galway-Mayo Institute of Technology, Galway, IrelandD. MüllerEnrico Fermi Institute, University of Chicago, Chicago, IL 60637R. A. OngDepartment of Physics, University of California, Los Angeles, CA 90095R. PallassiniDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKD. PetryDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011J. QuinnExperimental Physics Department, National University of Ireland, Belfield, Dublin 4, IrelandN. W. ReayDepartment of Physics, Kansas State University, Manhattan, KS 66506P. T. ReynoldsDepartment of Physics, Cork Institute of Technology, Cork, IrelandH. J. RoseDepartment of Physics, University of Leeds, Leeds, LS2 9JT Yorkshire, England, UKG. H. SembroskiDepartment of Physics, Purdue University, West Lafayette, IN 47907R. A. SidwellDepartment of Physics, Kansas State University, Manhattan, KS 66506N. R. StantonDepartment of Physics, Kansas State University, Manhattan, KS 66506S. P. SwordyEnrico Fermi Institute, University of Chicago, Chicago, IL 60637V. V. VassilievHigh Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112S. P. WakelyEnrico Fermi Institute, University of Chicago, Chicago, IL 60637T. C. WeekesFred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, P.O. Box 97, Amado, AZ 85645
2002en
ABI
Annotatsiya
A very high energy gamma-ray signal has been detected at the 5.5sigma level from H1426+ 428, an X-ray-selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 to 1998 with the Whipple 10 m imaging atmospheric Cerenkov telescope as part of a general blazar survey; the results of these observations, although not statistically significant, were consistently positive. X-ray observations of H1426+ 428 during 1999 with the BeppoSAX instrument revealed that the peak of its synchrotron spectrum occurs at greater than 100 keV, leading to the prediction of observable TeV emission from this object. H1426+ 428 was monitored extensively at the Whipple Observatory during the 1999, 2000, and 2001 observing seasons. The strongest TeV signals were detected in 2000 and 2001. During 2001, an integral flux of 2.04 +/- 0.35 x 10(-11) cm(-2) s(-1) above 280 GeV was recorded from H1426+ 428. The detection of H1426+ 428 supports the idea that, as also seen in Mrk 501 and 1ES 2344+ 514, BL Lacertae objects with extremely high synchrotron peak frequencies produce gamma-rays in the TeV range.
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