Correlations between X-Ray Spectral Characteristics and Quasi-Periodic Oscillations in Scorpius X-1

Details Correlations between X-Ray Spectral Characteristics and Quasi-Periodic Oscillations in Scorpius X-1 Correlations between X-Ray Spectral Characteristics and Quasi-Periodic Oscillations in Scorpius X-1

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...663.1225b&link_type=abstract

The Astrophysical Journal, Volume 663, Issue 2, pp. 1225-1231.

Astronomy and Astrophysics

Astronomy

8

Accretion, Accretion Disks, Stars: Individual: Constellation Name: Scorpius X-1, Stars: Neutron, X-Rays: Individual: Constellation Name: Scorpius X-1

Scientific paper

Correlations between 1-10 Hz quasi-periodic oscillations (QPOs) and spectral power-law index have been reported for black hole (BH) candidate sources and one neutron star source, 4U 1728-34. An examination of QPO frequency and index relationships in Sco X-1 is reported here. We discover that Sco X-1, representing Z-source groups, can be adequately modeled by a simple two-component model of Compton up-scattering with a soft photon electron temperature of about 0.4 keV, plus an Iron K line. The results show a strong correlation between spectral power-law index and kHz QPOs. Because Sco X-1 radiates near the Eddington limit, one can infer that the geometrical configuration of the Compton cloud (CC) is quasi-spherical from high radiation pressure in the CC. Thus, we conclude that the high Thomson optical depth of the Compton cloud, in the range of ~5-6 from the best-fit model parameters, is consistent with the neutron star's surface being obscured by material. Moreover, a spin frequency of Sco X-1 is likely suppressed due to photon scattering off CC electrons. In addition, we demonstrate how the power spectrum evolves when Sco X-1 transitions from the horizontal branch to the normal branch.

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