Paper: astro-ph/0510053
Date: Mon, 3 Oct 2005 17:04:40 GMT (95kb)

Title: Frequency spectrum of gravitational radiation from global
hydromagnetic oscillations of a magnetically confined mountain on an
accreting neutron star

Authors: D. J. B. Payne and A. Melatos

Categories: astro-ph

Comments: 4 figures, accepted for publication in ApJ
\\
Recent time-dependent, ideal-magnetohydrodynamic (ideal-MHD) simulations of
polar magnetic burial in accreting neutron stars have demonstrated that stable,
magnetically confined mountains form at the magnetic poles, emitting
gravitational waves at $f_{*}$ (stellar spin frequency) and $2 f_{*}$. Global
MHD oscillations of the mountain, whether natural or stochastically driven, act
to modulate the gravitational wave signal, creating broad sidebands (full-width
half-maximum $\sim 0.2f_*$) in the frequency spectrum around $f_{*}$ and $2
f_{*}$. The oscillations can enhance the signal-to-noise ratio achieved by a
long-baseline interferometer with coherent matched filtering by up to 15 per
cent, depending on where $f_*$ lies relative to the noise curve minimum.
Coherent, multi-detector searches for continuous waves from nonaxisymmetric
pulsars should be tailored accordingly.

\\ ( http://arXiv.org/abs/astro-ph/0510053 , 95kb)