Abstract
Cygnus X-3 massive binary system is one of the powerful sources of radio and X-ray emission consisting of an accreting compact object, probably a black hole, with a Wolf-Rayet star companion. Based on the detections of ultra high energy gamma-rays by Kiel and Havera Park, Cygnus X-3 has been proposed to be one of the most powerful sources of charged cosmic ray particles in the Galaxy. The results of long-term observations of the Cyg X-3 binary at energies 800 GeV–85 TeV detected by SHALON in 1995 are presented with images, integral spectra and spectral energy distribution. The identification of source with Cygnus X-3 detected by SHALON was secured by the detection of its 4.8 hour orbital period in TeV gamma-rays. During the whole observation period of Cyg X-3 with SHALON significant flux increases were detected at energies above 0.8 TeV. These TeV flux increases are correlated with flaring activity at a lower energy range of X-ray and/or at observations of Fermi LAT as well as with radio emission from the relativistic jets of Cygnus X-3. The variability of very high-energy gamma-radiation and correlation of radiation activity in the wide energy range can provide essential information on particle mechanism production up to very high energies. Whereas, modulation of very high energy emission connected to the orbital motion of the binary system, provides an understanding of the emission processes, nature and location of particle acceleration.
Highlights
SHALON is a high-altitude imaging atmospheric Cherenkov telescope for the detection of very high energy γ -rays from 800 GeV to 100 TeV. γ -astronomical research has been carryied out with the SHALON telescope since 1992
The subsequent analysis specially developed for the SHALON telescopes and based on the Tikhonov regularization method [3, 4] improves the accuracy to a value of less than 0.01◦ [5]
Two observations were particulary important: the Kiel [9] results and contemporaneous observations at Haverah Park [10]. These results indicated a very large UHE flux from Cygnus X-3
Summary
SHALON is a high-altitude imaging atmospheric Cherenkov telescope for the detection of very high energy γ -rays from 800 GeV to 100 TeV. γ -astronomical research has been carryied out with the SHALON telescope since 1992. SHALON is a high-altitude imaging atmospheric Cherenkov telescope for the detection of very high energy γ -rays from 800 GeV to 100 TeV. Γ -astronomical research has been carryied out with the SHALON telescope since 1992. During the period 1992–2016 SHALON has been used for observations of different galactic and extragalactic objects (see these Proceedings and [1]). Among them are objects of the Cygnus region. The Cygnus region contains a number of sources of radio and X-ray emission and some of them were detected at high energies. The most powerful have been supposed to be GeV-TeV γ -ray emitters. Among them are the Cyg X-3 massive binary system Among them are the Cyg X-3 massive binary system (Figs. 1, 2, 3, 4, 5, 6, 7)
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