QPO-Spectral Index relation in Galactic Black Holes. Mass determination of Cygnus X-1.

Details QPO-Spectral Index relation in Galactic Black Holes. Mass determination of Cygnus X-1. QPO-Spectral Index relation in Galactic Black Holes. Mass determination of Cygnus X-1.

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0766s&link_type=abstract

American Astronomical Society, HEAD meeting #9, #7.66; Bulletin of the American Astronomical Society, Vol. 38, p.360

Astronomy and Astrophysics

Astronomy

Scientific paper

Correlation of spectral versus temporal properties in Black
Hole (BH) X-ray binaries during transitions between states provides
important information on the properties of the system. Recently, the
saturation effect observed in photon index - quasi-periodic
oscillation (QPO) frequency dependence has been proposed as a BH
signature. Our analysis confirmed the saturation for the BH source
Cygnus X-1. The absence of saturation was established for at least one
neutron star source, 4U 1728-34. I will review these results and
discuss an application of spectral index-OPQ correlation for BH mass
determination in Cygnus X-1, using a correlation scaling method. We
use GRO J1655-40 (for which the BH mass is known) as a reference
source during our mass determination procedure.

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