Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2369s&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
We discuss some results of the observation gamma-quanta sources Geminga and Tycho's SNR and the discrimination methods between gamma-rays and protons. IGeminga = (0.48 ± 0.17) • 10-12 cm-2 s-1 and IT ycho = (1.89 ± 0.56) • 10-13 cm-2 s-1 . Selection of showers produced by gamma-quanta from background has made according the following criteria 1) α < 20o ; 2) length/width> 1.6; 3) int0> 0.6; 4) int1> 0.8; 5) distance is < 3.5. The experimental distributions of image parameters on used criteria are presented. The time analysis of observation data on NGC 1275, Mkn 501, Crab Nebula, Cygnus X-3 has shown that the contribution of cosmic ray background into observable gamma-quanta does not exceed 10 15%. The obtained Tycho's spectrum compares with theoretical predictions. More than ten years ago the project of the mirror Cherenkov telescope SHALON (Sinitsyna, 1987) was suggested and the first observations were started in 1991 at the ALATOO mountain observatory at the height 3338m (Sinitsyna, 1992-2003)[1, 2]. A distinctive property of the telescope is a large full angle due to a relatively large size of photomultipliers matrix (144 pixels, full angle 8o )(Fig. 1). This allows to detect extensive air showers coming at to the distance up to 120 m from an optical axis of the telescope, that increases the statistics from the sources of very high energy gamma-quanta. In addition such a large full angle of an image matrix allows to research an isotropic background of extensive air showers from charged particles of cosmic rays (OFF data) simultaneously with the observation of gamma-quanta local sources (ON data) at the same optical characteristics of atmosphere. It is particularly important because in our research of gammasources the extensive air showers generated by gamma-quanta are selected not only according to exceeding flux of showers in a small angle, but also according to the differences of the evaluation in the atmosphere depth of electron-photon cascades generated by protons and by nuclei of cosmic rays. Such additional selection of electron-photon showers among extensive air
Alaverdian A. Y.
Arsov T. P.
Borisov S.S.
Kasparov G. M.
Mirzafatikhov R. M.
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