Long-term observations of the Cyg X-3 and λCygni SNR at ultrahigh energies by SHALON mirror Cherenkov telescopes

The Cygnus X region contains a number of powerful sources of radio and X -ray radiation which are also considered as potential sources of high and ultrahigh-energy radiation. One of such sources is the massive binary system Cyg X-3 systematically observed by the SHALON telescope from 1995 to the present. The results of Cyg X-3 observations are presented by γ -ray spectra and images at energies of 800 GeV-85 TeV. In the field of the SHALON telescope, an ultrahigh-energy γ -ray source was detected, whose position is ∼2° from Cyg X-3; its coordinates coincide with coordinates of the known source of radio and X -ray radiation, i.e., the γ Cygni SNR supernova remnant. The γ Cygni SNR spectra, spectral energy distribution, and image according to the SHALON telescope data are presented in the energy range of 800 GeV-50 TeV.