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Cyg X‐3: A gamma‐ray binary
Author(s) -
Sinitsyna Vera G.,
Sinitsyna Vera Yu.
Publication year - 2021
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.202113930
Subject(s) - physics , astrophysics , luminosity , astronomy , black hole (networking) , flux (metallurgy) , gamma ray , telescope , binary number , spectral line , x ray binary , binary black hole , galaxy , neutron star , arithmetic , mathematics , computer network , routing protocol , routing (electronic design automation) , materials science , computer science , metallurgy , gravitational wave , link state routing protocol
Cygnus X‐3 (Cyg X‐3) is the famous binary system containing a black hole. It is actively studied through the wide range of electromagnetic spectra from radio band up to ultrahigh energies. Cyg X‐3 has long been considered an object for very high energy gamma‐ray observations. We present the results of more than 20‐year‐long studies of Cyg X‐3 in the range of 800 GeV to 100 TeV with the SHALON telescope. The detected TeV γ ‐ray source was identified with Cyg X‐3 based on the detection of the γ ‐ray flux modulation during the orbital period of this binary system of 4.8 hr. The detected modulation of TeV γ ‐ray emission with orbit, together with the high luminosity of the companion star of Cyg X‐3 and the close orbit, leads to the efficient generation of the part of γ ‐ray emission in the inverse Compton scattering. The correlation of TeV flux increases with the flaring activity of Cyg X‐3 in X‐ray and radio ranges is found, which could be associated with powerful mass ejections from the central regions around the black hole.