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.

中文翻译：

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Cyg X-3：伽玛射线二进制

天鹅座X-3（Cyg X-3）是著名的包含黑洞的二进制系统。从无线电频段到超高能量的广泛电磁频谱，都对其进行了积极的研究。Cyg X-3长期以来一直被认为是超高能伽马射线观测的对象。我们介绍了使用SHALON望远镜对Cyg X-3进行的长达20年研究的结果，这些研究在800 GeV到100 TeV的范围内进行。所检测到的TeV γ射线源，用天鹅座X-3确定基于检测的γ期间4.8小时的该二元系统的轨道周期射线通量调制。的TeV的检测出的调制γ带有轨道的射线辐射，以及Cyg X-3伴星和紧密轨道的高发光度，导致在康普顿逆散射中有效生成部分γ射线辐射。TeV通量的相关性随着Cyg X-3在X射线中的爆发活动而增加，并且发现了射电范围，这可能与黑洞周围中心区域的强质量抛射有关。