Period doubling and non-linear resonance in the black hole candidate IGR J17091-3624 ?

Details Period doubling and non-linear resonance in the black hole candidate IGR J17091-3624 ? Period doubling and non-linear resonance in the black hole candidate IGR J17091-3624 ?

2012-02-02

arxiv.org/abs/1202.0483v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, accepted by Astronomy & Astrophysics Letters

Scientific paper

The two high frequency quasi periodic oscillations (HFQPOs) recently reported in the black hole candidate IGR J17091-3624 by Altamirano and Belloni (2012) are in a 5:2 frequency ratio (164 Hz to 66 Hz). This ratio is strongly suggestive of period doubling and nonlinear resonance analogous to phenomena known in RV Tauri-type pulsating stars (and recently discovered also in oscillations of RR Lyrae-type and of BL Herculis-type variables). An interpretation of the frequency ratio in terms of nonlinear interactions and a comparison with the HFQPOs reported in GRS 1915+105 may imply a mass of about 6 solar masses for the black hole in IGR J17091- 3624.

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