Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002basi...30..335r&link_type=abstract
Bulletin of the Astronomical Society of India, Vol.30, p. 335-340
Astronomy and Astrophysics
Astronomy
Cverenkov Spectrum, Atmospheric Attenuaation, Atmospheric Cverenkov Technique, Tev, Gamma-Ray Astronomy
Scientific paper
We have studied the propagation of Cverenkov photons generated by Very High Energy gamma-rays and hadrons in the atmosphere. Photon production height distributions derived from semi-empirical methods agree with those obtained by Monte Carlo simulations. The Cverenkov photon spectra at various observation altitudes are obtained after applying wavelength dependent corrections for the attenuation of photons in the atmosphere. The calculations were done both for gamma - ray and hadron primaries of various energies. The spectra are found to be dependent on altitude as well as primary energy. The peak of the photon spectrum seems to shift towards the shorter wavelength with increasing primary energy at a given altitude. The fraction of the UV component in the Cverenkov spectrum is also estimated. The hadron generated Cverenkov spectra are richer in UV light at higher altutudes.
Abdel Rahman A.-M. M.
Acharya Bobby Samir
Bhat Narayan P.
Chitnis Varsha R.
Majumdar Parthasarathi
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