KiloHertz QPOs and the Marginally Stable Orbit

Details KiloHertz QPOs and the Marginally Stable Orbit KiloHertz QPOs and the Marginally Stable Orbit

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1502k&link_type=abstract

American Astronomical Society, HEAD meeting #4, #15.02; Bulletin of the American Astronomical Society, Vol. 31, p.712

Astronomy and Astrophysics

Astronomy

Scientific paper

The discovery of millisecond quasi-periodic oscillations (QPOs) from neutron-star x-ray binaries has opened a new window for the study of accretion flows in strong gravitational fields. Recently, QPO observations of 4U1820-30 have been interpreted as evidence for the existence of the marginally stable orbit, a key prediction of general relativity. I present new data on 4U1820-30 and on the relation between kHz QPOs, x-ray spectra, and low-frequency timing noise. I examine the claims for and against detection of the marginally stable orbit.

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