The model constraints from the observed trends for the quasi-periodic oscillation in RE J1034+396

We analyze the time variability of the X-ray emission of RE J1034+396 – an active galactic nucleus with the first firm detection of a quasi-periodic oscillations (QPO). Based on the results of a wavelet analysis, we find a drift in the QPO central frequency. The change in the QPO frequency correlate...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2010-12, Vol.524, p.A26
Main Authors: Czerny, B., Lachowicz, P., Dovčiak, M., Karas, V., Pecháček, T., Das, T. K.
Format: Article
Language:English
Subjects:
accretion
accretion disks
Astronomy
Earth, ocean, space
Exact sciences and technology
galaxies: active
galaxies: individual: RE J1034+396
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Summary:We analyze the time variability of the X-ray emission of RE J1034+396 – an active galactic nucleus with the first firm detection of a quasi-periodic oscillations (QPO). Based on the results of a wavelet analysis, we find a drift in the QPO central frequency. The change in the QPO frequency correlates with the change in the X-ray flux with a short time delay. The data specifically suggest a linear dependence between the QPO period and the flux, and this gives important constraints on the QPO models. In particular, it excludes explanation in terms of the orbiting hot spot model close to a black hole. Linear structures such as shocks, spiral waves, or very distant flares are favored.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/200913724