@article{psaltisOriginQuasiPeriodicOscillations2000,
	title = {On the {Origin} of {Quasi}-{Periodic} {Oscillations} and {Broad}-band {Noise} in {Accreting} {Neutron} {Stars} and {Black} {Holes}},
	url = {http://adsabs.harvard.edu/abs/2000astro.ph..1391P},
	abstract = {Accreting neutron stars and black holes share a number of rapid 
variability characteristics, such as quasi-periodic oscillations and
broad-band noise. The frequencies of these features were recently shown
to be comparable to fundamental general relativistic frequencies of
perturbed test-particle orbits near the compact objects. In this paper
we propose a dynamical model for producing modulations in the inner disk
properties at these characteristic frequencies. We postulate that a
transition radius exists in the accretion disk close to the compact
object and investigate its response to a broad spectrum of density
fluctuations. We find that the transition radius acts as a low band-pass
filter with a broadband response that is constant at frequencies lower
than the inverse radial drift timescale and decreases above it as the
inverse of the frequency. Moreover, the response shows strong resonances
at frequencies nearly equal to the orbital, periastron-precession, and
nodal-precession frequencies, thereby accounting for the observed
power-density spectra of accreting compact objects and the correlations
between their characteristic frequencies.},
	urldate = {2020-01-23},
	journal = {arXiv Astrophysics e-prints},
	author = {Psaltis, Dimitrios and Norman, Colin},
	month = jan,
	year = {2000},
	keywords = {Astrophysics},
	pages = {arXiv:astro--ph/0001391},
}

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