Is the Bardeen-Petterson effect responsible for the warping and precession in NGC 4258?
نویسندگان
چکیده
منابع مشابه
Hydrodynamic Simulations of the Bardeen–Petterson Effect
We present SPH simulations of accretion discs in orbit about rotating compact objects, such as black holes and neutron stars, and study the structure of warped discs produced by the Bardeen-Petterson effect. We calculate the transition radius out to which the disc specific angular momentum vector is aligned with that of the black hole. We focus on the parameter regime where the warp dynamics ar...
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15 صفحه اولThe Bardeen-Petterson Effect as a Possible Mechanism for Quasi-periodic Oscillations in X-Ray Binaries
The Bardeen-Petterson effect around a rapidly rotating compact object causes a tilted accretion disk to warp into the equatorial plane of the rotating body at a characteristic radius. We show that the orbital frequency at this transition radius naturally falls into a range (2-1600 Hz) required to explain observed quasi-periodic oscillations (QPOs) in low-mass X-ray binaries (LMXBs). The Bardeen...
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We consider the implications of recent infrared and radio observations of the nucleus of NGC 4258. There is no direct evidence that the nucleus has been steadily accreting on the viscous timescale of the outer masing disk, which is ∼> 10 9 yr. Thus the mass accretion rate in the outer disk need not be the same as in the inner accretion flow where most of the gravitational binding energy is rele...
متن کاملBardeen-petterson Effect and Quasi-periodic Oscillations in X-ray Binaries
The Bardeen-Petterson effect around a rapidly-rotating compact object causes a tilted accretion disk to warp into the equatorial plane of the rotating body. Viscous forces cause the accretion flow to divide into two distinct regions an inner aligned accretion disk and an outer tilted accretion disk. The transition between these two occurs at a characteristic radius that depends on the mass and ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2007
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2007.11918.x