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

Diego Altamirano (2) - ((1) INAF-Osservatorio Astronomico di Brera; Italy (2) University of Amsterdam; the Netherlands); Tomaso M. Belloni (1)

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

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arxiv 1303.4934 v1 pith:IVNJEZES submitted 2013-03-20 astro-ph.HE

Tomaso M. Belloni (1) , Diego Altamirano (2) - ((1) INAF-Osservatorio Astronomico di Brera , Italy (2) University of Amsterdam , the Netherlands) This is my paper · ORCID

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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. We discuss the possible implications of the new pair of frequencies comparing them with the existing theoretical models.

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