Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..121b&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 121 - 122
Astronomy and Astrophysics
Astrophysics
X-Ray Binaries: Power Spectra, X-Ray Binaries: Black Holes
Scientific paper
With SIGMA the authors measured in detail the power density spectra (PDS) of two black hole X-ray binaries, Cyg X-1 and GRO J0422+32, in hard X-rays (40-300 keV). Most of the time the limiting frequency was 0.125 Hz, but the long observations on a high orbit allowed to reach down to 10-5Hz. In GRO J0422+32 the PDS was flat top, breaking around 0.03 Hz with a 0.3 Hz QPO, and indications for a deficit at the lowest frequencies. This X-ray nova was followed while its flux decreased, and a coherent pattern of hardening and increase of the noise (from 15% to 25%) relative to the total flux emerged. Cyg X-1 was observed several times at different flux levels (but always in the hard state). Its PDS was flat top, with at times broad QPO features at the break, and a strong very low frequency noise. Its relative noise was around 20%, but strongly varying. Those variations were apparently uncorrelated to the source flux.
Ballet Jean
Churazov Eugene
Denis Miroslav
Gilfanov Marat
Olive Jean-Francios
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