Quasi-periodic variations in the radio emission from GRS 1915+105

Abstract

Observations of the radio emission at 15 GHz from GRS 1915+105 were made with the Ryle telescope intermittently during late 1995, early 1996, at a time when the source was active in the X-ray band. Wide variations in flux density were observed during the flaring activity. On several days when the flux was at an intermediate level there appeared to be a quasi-periodic component with a period close to 40 min. Later observations show that other periods are also present.