A hybrid version of the Whipple observatory's air Cherenkov imaging camera for use in moonlight

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 grea...

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Detalles Bibliográficos
Autores principales: 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.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09276505_v6_n2_p205_Chantell
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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.

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