On twin peak quasi-periodic oscillations resulting from the interaction between discoseismic modes and turbulence in accretion discs around black holes
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Date
2020Author
Ortega Rodríguez, Manuel
Solís Sánchez, Hugo
Álvarez García, L.
Dodero Rojas, Esteban
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Given the peculiar and (in spite of many efforts) unexplained quasi-periodic oscillation (QPO) twin peak phenomena in accretion disc psd observations, the present
exploratory analytical article tries to inquire deeper into the relationship between
discoseismic modes and the underlying driving turbulence in order to assess its importance. We employ a toy model in the form of a Gaussian white noise driven damped
harmonic oscillator with stochastic frequency. This oscillator represents the discoseismic mode. (Stochastic damping was also considered, but interestingly found to be less
relevant for the case at hand.) In the context of this model, we find that turbulence
interacts with disc oscillations in interesting ways. In particular, the stochastic part
in the oscillator frequency behaves as a separate driving agent. This gives rise to 3:2
twin peaks for some values of the physical parameters, which we find. We conclude
with the suggestion that the study of turbulence be brought to the forefront of disc
oscillation dynamics, as opposed to being a mere background feature. This change of
perspective carries immediate observable consequences, such as considerably shifting
the values of the (discoseismic) oscillator frequencies.
External link to the item
10.1093/mnras/stz3541
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- Meteorología [504]