Pulse shape selection in very high energy gamma-ray astronomy

Details Pulse shape selection in very high energy gamma-ray astronomy Pulse shape selection in very high energy gamma-ray astronomy

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jphg...24..255r&link_type=abstract

Journal of Physics G: Nuclear and Particle Physics, Volume 24, Issue 1, pp. 255-266 (1998).

Physics

7

Scientific paper

Very high energy gamma-ray astronomers using the atmospheric Cerenkov technique must contend with a large background of light pulses due to cosmic ray-initiated cascades. Significant advances have been made in developing techniques to reduce this background: the imaging technique can have a figure of merit, q, in excess of 6 near the zenith. However, q decreases as the zenith angle increases. In this paper we describe a new technique based on the temporal Cerenkov pulse shape and show that the use of rise time and FWHM cuts are effective discriminators at all zenith angles. For flat-spectrum sources at large zenith angles 0954-3899/24/1/027/img5. Measured parameter distributions are compared with simulations and the methods of making the cuts are discussed. A sensitivity to cosmic-ray composition is also suggested.

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