Intensity-dependent quasi-periodic oscillations in the X-ray flux of GX5 - 1

Details Intensity-dependent quasi-periodic oscillations in the X-ray flux of GX5 - 1 Intensity-dependent quasi-periodic oscillations in the X-ray flux of GX5 - 1

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..225v&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, July 18, 1985, p. 225-230. Research supported by the Alexander von Humboldt-Stiftung and John

Physics

193

Neutron Stars, Stellar Oscillations, X Ray Binaries, Dwarf Novae, Field Strength, Galactic Bulge, Power Spectra, Stellar Magnetic Fields, Temporal Distribution

Scientific paper

The X-ray flux of the bright galactic bulge source GX 5-1 shows intensity-dependent quasi-periodic oscillations between ≡20 and ≡40 Hz, appearing as a broad peak in the power spectrum whose centroid frequency, width and integrated excess power strongly depend on the source intensity. The strength and steepness of low-frequency noise present in the power spectra below 15 Hz also depend on the source intensity. No evidence is found for coherent X-ray pulsations between 0.5 and 2,000 Hz. The authors discuss possible mechanisms to explain these new phenomena.

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