Cyg X‐3: A gamma‐ray binary. Issue 1 (4th February 2021)

• Record Type: Journal Article
• Authors: Sinitsyna, Vera G.; Sinitsyna, Vera Yu.
• Other Names: Zen Vasconcellos C.A. guestEditor.; Hess P.O. guestEditor.; Piccinelli G. guestEditor.; Vargas Magaña M. guestEditor.; Ureña-Lopez L. guestEditor.; González Felipe R. guestEditor.; Boller Th. guestEditor.; Gullberg S. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 342:Issue 1/2(2021)
• Page Start: 337
• Page End: 341
• Publication Date: 2021-02-04
• Subjects: massive binary system -- Cyg X‐3 -- black hole -- multiwavelength electromagnetic emission; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.202113930
• Languages: English
• ISSNs: 0004-6337

Abstract

Abstract: 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.