出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 ow and show how this process is affected by uctuations in mass accretion rate which themselves generate broadband variability power. This causal connection between physical processes allows us to dene a full, self-consistent model of the PSD which we t to data from the 1998 outburst of XTE J1550-564. This is the rst ever attempt to t a physical model of the PSD to data. Fast
