Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..406v&link_type=abstract
X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G
Physics
2
Neutron Stars, Relativistic Stars: Structure, Stability, And Oscillations, X-Ray Binaries, Physics Of Black Holes
Scientific paper
Twin kilohertz quasi-periodic oscillation peaks have been discovered with the Rossi X-Ray Timing Explorer in some 20 neutron-star low-mass X-ray binaries. The frequencies of these peaks vary between ~500 and ~1200 Hz and they likely diagnose the motion of the accreting matter in the accretion flow just a few kilometers from the neutron star surface. In these regions strong field gravity theory is essential to correctly describe the motion of matter, and the precise equation of state of supranuclear density matter, by determining the radius of and the mass distribution in the neutron star, becomes a crucial ingredient in understanding the observations. Models for kHz QPOs therefore explicitly include these fundamental theories and point the way as to how to test general relativity in the strong field limit and proposed equations of state. In this paper I review the observational situation with respect to this phenomenon. .
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