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We report the discovery in the Rossi X-Ray Timing Explorer data of GRS1915+105 of a second quasi-periodic oscillation at 34 Hz, simultaneous withthat observed at 68 Hz in the same observation. The data corresponded to thoseobservations from 2003 where the 68-Hz oscillation was very strong. Thesignificance of the detection is 4.2 sigma. These observations correspond to avery specific position in the colour-colour diagram for GRS 1915+105,corresponding to a harder spectrum compared to those where a 41 Hz oscillationwas discovered. We discuss the possible implications of the new pair offrequencies comparing them with the existing theoretical models.

Discovery of a 34 Hz Quasi-Periodic Oscillation in the X-ray emission of GRS 1915+105