Free access article

A&A 423, 415-419 (2004)
DOI: 10.1051/0004-6361:20041021

Evidence for TeV gamma ray emission from TeV J2032+4130 in Whipple archival data

M. J. Lang¹, D. A. Carter-Lewis², D. J. Fegan³, S. J. Fegan⁴, A. M. Hillas⁵, R. C. Lamb⁶, M. Punch⁷, P. T. Reynolds⁸ and T. C. Weekes<sup>4

1</sup>  Department of Physics, National University of Ireland, Galway, Ireland
    e-mail: mark.lang@nuigalway.ie
²  Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
³  Department of Experimental Physics, University College, Belfield, Dublin 4, Ireland
⁴  Fred Lawrence Whipple Observatory, Harvard-Smithsonian CfA, Amado, AZ 85645, USA
⁵  Department of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
⁶  Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
⁷  Physique Corpusculaire et Cosmologie, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
⁸  Department of Applied Physics and Instrumentation, Cork Institute of Technology, Bishopstown, Cork, Ireland

(Received 5 April 2004 / Accepted 12 May 2004)

Abstract
A reanalysis of data taken on the Cygnus region in 1989-90 using the Whipple Observatory atmospheric Cherenkov imaging telescope confirms the existence of the TeV J2032+4130 source reported by the Crimean Astrophysical Observatory and published by the HEGRA Collaboration. The significance at the a priori HEGRA position is 3.3 . The peak signal was found at RA = 20h32m, Dec = +41°33 '. This is 0.6° north of Cygnus X-3 which was the original target of the observations. The flux level (12% of the level of the Crab Nebula) is intermediate between the two later observations and suggests that the TeV source is variable.

Key words: gamma rays: observations

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© ESO 2004

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