Quasi-periodic oscillations in the X-ray flux of CYG X-2

Details Quasi-periodic oscillations in the X-ray flux of CYG X-2 Quasi-periodic oscillations in the X-ray flux of CYG X-2

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..469h&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Feb. 6, 1986, p. 469-471. Research supported by the John Simon Guggenheim Memorial Foundation

Computer Science

68

Cosmic Noise, Periodic Variations, Variable Stars, X Ray Sources, X Ray Spectra, Black Body Radiation, Bremsstrahlung, Power Spectra, Radiant Flux Density, Thermal Emission

Scientific paper

Quasi-periodic X-ray oscillations (QPOs) and low-frequency noise have been discovered in Cyg X-2. The centroid frequency of the oscillations is correlated with the source intensity in the same way as in GX 5-1: the frequency increases when the source intensity goes up. Cyg X-2 differs from GX 5-1, where the amplitude of the oscillations and of the low-frequency noise go hand in hand, in that the amplitude of the QPOs decreases while that of the low-frequency noise increases with increasing source intensity. The spectrum of the persistent emission is described as the sum of a variable 1.2 keV black body component, a more or less constant 7 keV thermal bremsstrahlung component, and an iron emission line.

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