Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nyasa.773..256i&link_type=abstract
Waves in Astrophysics, vol. Volume 773, p. 256-260
Astronomy and Astrophysics
Astronomy
Pulsars, Accretion Disks, Low Frequencies, Variability, Stellar Gravitation, Relativistic Effects, X Rays, Approximation, Black Holes (Astronomy)
Scientific paper
Variability on a variety of timescales is a commonly observed feature of astronomical systems ranging from compact binaries to active galactic nuclei. In some cases, such as those involving the x-ray emissions of certain black-hole candidates and the Z-sources among low-mass x-ray binaries, quasi-periodic oscillations are observed to exhibit periods of oscillation that are much longer than the dynamical timescale of the underlying system. In an attempt to understand these long-timescale phenomena, several analyses have focused on the possibility that they are associated with low-frequency oscillations in the inner regions of accretion disks associated with the observed systems. These analyses are compromised by their use of a pseudo-Newtonian approximation in which the Newtonian gravitational potential is modified in a particular way in order to simulate certain effects of general relativity. Our purpose here is to point out and demonstrate that this approximation can be replaced by a fully relativistic treatment based on a relativistic formalism that has recently become available. We describe the first applications of the relativistic formalism to the problem of low-frequency modes in accretion disks around compact objects.
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