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Article Dans Une Revue New Astronomy Année : 2005

Flux modulation from non-axisymmetric structures in accretion discs

Résumé

Non-axisymmetric accretion discs can lead to flux variability. Here we provide an analytic framework for modeling non-axisymmetric structures like hotspots and spiral waves and their influence on observed timing measurements. The presently unexplained low-frequency quasi-periodic oscillations (LFQPO), observed in X-ray binaries and cataclysmic variables, could be the result of such discs. Our framework serves as a guide to quantify the properties that non-axisymmetric structures produced by nonlinear accretion disc models must have in order to explain observed features such as LFQPOs. The results from our microquasar applications also provide analogous predictions for X-ray modulation in active galactic nuclei. The formalism and physical interpretation is of practical use for generic non-axisymmetric accretion disc systems.

Dates et versions

hal-00176034 , version 1 (02-10-2007)

Identifiants

Citer

P. Varniere, Eric G. Blackman. Flux modulation from non-axisymmetric structures in accretion discs. New Astronomy, 2005, 11, pp.43-51. ⟨10.1016/J.NEWAST.2005.05.005⟩. ⟨hal-00176034⟩
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