Discovery of rapid quasi-periodic oscillations in Scorpius X-1

Details Discovery of rapid quasi-periodic oscillations in Scorpius X-1 Discovery of rapid quasi-periodic oscillations in Scorpius X-1

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..230m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 230-237. DOE-sponsored research.

Astronomy and Astrophysics

Astronomy

70

Periodic Variations, Pulsars, Stellar Oscillations, X Ray Binaries, X Ray Spectra, Exosat Satellite, Flux Density, Fourier Analysis, Power Spectra, Spaceborne Astronomy, Spectrum Analysis

Scientific paper

The X-ray flux from Sco X-1 can vary quasi-periodically. Fourier analysis of 5-20 keV X-ray data taken while the source was quiescent shows a power density peak at 6 Hz, with a 2 Hz FWHM, and which corresponds to 5 percent of the flux (rms amplitude). No 6 Hz peak was observed when the source was more active, but rather a broad distribution of excess power up to 25 Hz was seen. The mode of variability switched from one to the other within 500 s, settling into the 6 Hz mode about 1 hr into quiescence. A different mode of quasi-periodic oscillation with power in a broad band between 14 and 24 Hz, corresponding to a 6 percent rms amplitude, occurred for short periods during the active phase whenever the flux reached the quiescent level.

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