A hybrid version of the Whipple Observatory's atmospheric Cherenkov imaging camera that permits observation during periods of bright moonlight is described. The hybrid camera combines a blue-light blocking filter with the standard Whipple imaging camera to reduce sensitivity to wavelengths greater than 360 nm. Data taken with this camera are found to be free from the effects of the moonlit night-sky after the application of simple off-line noise filtering. This camera has been used to successfully detect TeV gamma rays, in bright moon light, from both the Crab Nebula and the active galactic nucleus Markarian 421 at the 4.9σ and 3.9σ levels of statistical significance, respectively. The energy threshold of the camera is estimated to be 1.1 ( + 0.6/-0.3) TeV from Monte Carlo simulations.
Documento: | Artículo |
Título: | A hybrid version of the Whipple observatory's air Cherenkov imaging camera for use in moonlight |
Autor: | Chantell, M.C.; Akerlof, C.W.; Badran, H.M.; Buckley, J.; Carter-Lewis, D.A.; Cawley, M.F.; Connaughton, V.; Fegan, D.J.; Fleury, P.; Gaidos, J.; Hillas, A.M.; Lamb, R.C.; Pare, E.; Rose, H.J.; Rovero, A.C.; Sarazin, X.; Sembroski, G.; Schubnell, M.S.; Urban, M.; Weekes, T.C.; Wilson, C. |
Filiación: | Whipple Observatory, Harvard-Smithsonian CfA, P.O. Box 97, Amado, AZ 85645-0097, United States Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, United States Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, United States Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109-1120, United States Department of Physics, Tanta University, Tanta, Egypt Department of Physics and Astronomy, Iowa State University, Ames, IA 50011-3160, United States Physics Department, St. Patrick's College, Maynooth, County Kildare, Ireland Physics Department, University College, Dublin, Ireland LPNHE, Ecole-Polytechnique/CNRS-IN2P3, 91128 Palaiseau, France Department of Physics, Purdue University, West Lafayette, IN 47907, United States Department of Physics, University of Leeds, Leeds LS2 9JT, Yorkshire, United Kingdom Inst. de Astronomia y Fis. del E., C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina |
Año: | 1997 |
Volumen: | 6 |
Número: | 2 |
Página de inicio: | 205 |
Página de fin: | 214 |
DOI: | http://dx.doi.org/10.1016/S0927-6505(96)00055-2 |
Título revista: | Astroparticle Physics |
Título revista abreviado: | Astropart. Phys. |
ISSN: | 09276505 |
CODEN: | APHYE |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v6_n2_p205_Chantell |