A Likely Inclination Dependence in the Non-linear Variability of Quasi Periodic Oscillations from Black Hole Binaries

Abstract

We present a systematic analysis of the effects of orbital inclination angle on the non-linear variability properties of type-B and type-C QPOs from black hole binaries. We use the bicoherence, a measure of phase coupling at different Fourier frequencies for our analysis. We find that there is a likely inclination dependent change in the non-linear properties of type-C QPOs as the source transitions from a hard intermediate state to a soft intermediate state. High inclination (edge-on) sources show a change from a `web' to a `cross' pattern, while the low inclination (face-on) sources show a change from a `web' to a `hypotenuse' pattern. We present a scenario of a moderate increase in the optical depth of the Comptonising region as a possible explanation of these effects. The bicoherence of type-B QPOs do not exhibit any measurable inclination dependence.

arXiv comment13 pages, Accepted for publication in MNRAS

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