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

Understand

We report the discovery in the Rossi X-Ray Timing Explorer data of GRS 1915+105 of a second quasi-periodic oscillation at 34 Hz, simultaneous with that observed at 68 Hz in the same observation.

• The data corresponded to those observations from 2003 where the 68-Hz oscillation was very strong.
• The significance of the detection is 4.2 sigma.
• These observations correspond to a very specific position in the colour-colour diagram for GRS 1915+105, corresponding to a harder spectrum compared to those where a 41 Hz oscillation was discovered.