Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17076r&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Our continuing investigations of QPOs in black hole binaries yields evidence that pairs of high-frequency QPOs in XTE J15550--564 (near 184, 276 Hz) and GRO J1655--40 (300, 450 Hz) are harmonically related. When we select and average the power density spectra (PDS) for XTE J1550--564 (1998-1999 outburst) when the QPO at 282 Hz was detected, we find an additional QPO at 187 Hz. Selection of PDS with a QPO at 185 Hz results in an average PDS with a weak features at both 92 and 278. In addition, we confirm the suggestion of Miller et al. (2001) that the 270 Hz QPO seen in the April 2000 outburst is accompanied by a second feature at 180 Hz. Moreover, in both X-ray binaries the X-ray spectra show the same pattern of evolution as the QPO strength shifts from the lower to higher frequency. The fundamental frequencies for the two sources scale as M-1, suggesting similar values of the dimensionless spin parameter for the black holes.
McClintock Jeffrey
Muno Michael
Orosz Jerome
Remillard Ronald
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