English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Recent observations of accreting black holes reveal the presence ofquasi-periodic oscillations (QPO) in the optical power density spectra. Thecorresponding oscillation periods match those found in the X-rays, implying acommon origin. Among the numerous suggested X-ray QPO mechanisms, some may alsowork in the optical. However, their relevance to the broadband -- opticalthrough X-ray -- spectral properties have not been investigated. For the firsttime, we discuss the QPO mechanism in the context of the self-consistentspectral model. We propose that the QPOs are produced by Lense-Thirringprecession of the hot accretion flow, whose outer parts radiate in the opticalwavelengths. At the same time, its innermost parts are emitting the X-rays,explaining the observed connection of QPO periods. We predict that the X-rayand optical QPOs should be either in phase or shifted by half a period,depending on the observer position. We investigate the QPO harmonic content andfind that the variability amplitudes at the fundamental frequency are larger inthe optical, while the X-rays are expected to have strong harmonics. We thendiscuss the QPO spectral dependence and compare the expectations to theexisting data.

A unified Lense-Thirring precession model for optical and X-ray quasi-periodic oscillations in black hole binaries