Another major change in the radio source associated with CYG X-1

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radiant Flux Density, Radio Sources (Astronomy), Stellar Radiation, Variable Stars, X Ray Astronomy, X Ray Stars, Binary Stars, Black Holes (Astronomy), Radio Stars

Scientific paper

The sudden appearance of a faint radio source inside the probable position region for the X-ray source Cyg X-1 was associated with major changes in the X-ray emission observed during the period February-May 1971. The accurate position of the radio source led to an identification with the bright, blue star HDE226868. Optical investigations have established this object to be a binary system with a massive, invisible component that may be a black hole. One of the major characteristics of the Cyg X-1 radio source between March 31, 1971 and March 1975 is a flat radio spectrum, a spectral index of 0. The mean daily levels of Cyg X-1 during the period May 9 to May 20, 1975 are 0.031 Jy at 8,085 MHz, and 0.002 Jy at 2,695 MHz, representing a new state for the radio source.

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