TeV gamma-ray emission from binaries: 2129+47XR and Cygnus X-3

International audienceThe new galactic gamma-source (neutron star) 2129+47XR is detected at energy >0.8 TeV with flux (0.19±0.09)x10^-12 cm^2s^-1 and indices of the integral spectra are kγ=−1.12±0.06, kON=−1.28±0.07 and kOff=−1.73±0.07. The results of ten-year observation of galactic source Cygnus X-3 by SHALON mirror Cherenkov telescope are discussed. The gamma -quantum spectra and images of the sources are presented. The Cygnus X-3 binary, known for more than 20 years as a source with variable intensity have been regularly observed since a 1995. The the increase of gamma-quantum flux was observed in 1997 and 2003 years

Very high energy gamma-quanta 1–65 TeV from the Cygnus X-3 binary

The results of almost ten-year observation of Cygnus X-3 point source by SHALON mirror Cherenkov telescope are presented. The galactic source Cygnus X-3, known for more than 10 years as a source with variable intensity 0.8TeV ) = (6.8 ± 0.7) • 10−13cm−2s−1. The flux in 2003 was (1.79 ± 0.33) • 10−12cm−2s−1. Earlier, in 1997, an increase in the flux was also observed (1.2 ± 0.5) • 10−12cm−2s−1. The limits on gamma-rays from Cygnus X-3, the source that results stimulated the construction of many new detectors are presented. These upper limits and SHALON fluxes are now more than a factor 100 less than the fluxes originally reported