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Communication Dans Un Congrès Année : 2015

Impact of the QPO models on the pulse profile

Résumé

Quasi-periodic oscillations (QPO) are an important probe of the timing properties of black-hole binaries. Many models are proposed in order to account for these features and it is difficult to differentiate them with current data. Here we aim to look at the actual pulse profile from each model in order to see how they could be differentiated and what kind of sources are the best targets for such a test. We consider three classes of simple models: elongated hot spots, tori and spirals. We perturb the equilibrium temperature of a thin disk to create these structures. The perturbed disk is supposed to emit blackbody radiation at the local temperature. Radiation is ray-traced in the Schwarzschild metric to a distant observer. We study the dependency with the source inclination of the pulse profile for different frequencies for these three models. The departure from a pure sinusoid of certain models at high inclination will be visible in the power density spectra by a higher presence of harmonics. In particular, hot spots and spirals lead to a (complete or partial) harmonic series which is lacking for a radially oscillating tori. We conclude that analyzing the first harmonics of the dominant power density spectrum peak for high-inclination sources is an interesting probe and it might make it possible to differentiate between axisymmetric (tori) and non-axisymmetric (hotspots and spirals) models.
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Dates et versions

hal-03743315 , version 1 (02-08-2022)

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Peggy Varnière, Frédéric Vincent. Impact of the QPO models on the pulse profile. SF2A-2015: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, Jun 2015, Toulouse, France, France. pp.187-191. ⟨hal-03743315⟩
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