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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The variability properties of Black Hole Binaries (BHBs) have been studied for well over 20 years and a very detailed phenomenological picture has been developed, particularly of the properties of the Power Spectral Density (PSD). However, the underlying physical processes that generate the variability are very poorly understood, especially low frequency Quasi Periodic Oscillations (QPOs). We describe a model that associates the QPO with Lense-Thirring Precession of the hot inner flow and show how this process is affected by fluctuations in mass accretion rate which themselves generate broadband variability power. This causal connection between physical processes allows us to define a full, self-consistent model of the PSD which we fit to data from the 1998 outburst of XTE J1550-564. This is the first ever attempt to fit a physical model of the PSD to data.

Fitting a self-consistent physical model to the power spectral density of XTE 1550-564