Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19411502l&link_type=abstract
American Astronomical Society Meeting 194, #115.02
Astronomy and Astrophysics
Astronomy
Scientific paper
In this paper, we systematically explore the different energy dependencies of variability for Cygnus X-1, GRS 1758-258, GX 339-4 and 1E 1740.7-2942 by using the RXTE data. The power spectrum of Cygnus X-1 becomes flatter in higher energy while its overall variability does not have a definitive trend with energy. The overall variability can increase, decrease or keep constant as energy increases. For GRS 1758-258, its power spectrum shape does not significantly change with energy, and its overall variability has maximum value the medium energy band (5-10keV). For most of the cases, the shape of the power spectrum of GX 339-4 does not change with energy, and its overall variability decreases with energy. We find that 1E 1740.7-2942 has higher overall variability and flatter spectra in higher energies, but there are some cases that the power spectrum shape doesn't significantly change with energy. By comparing these results with several X-ray emission models of BHCs, we are able to rule out some of the models.
Böttcher Markus
Liang Edison P.
Lin Dacheng
Smith Ian A.
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