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Title:
Correlations between X-ray Spectra and kHz QPOS in Sco X-1
Authors:
Bradshaw, Charles F.; Titarchuk, Lev; Kuznetsov, Sergey
Affiliation:
AA(The MITRE Corporation, McLean, VA 22102 and George Mason University Center for Earth Observing and Space Research, Fairfax, VA 22030. cbradshawatmitre.org), AB(George Mason University/Center for Earth Observing and Space Research, Fairfax, VA 22030), AC(US Naval Research Laboratory, Code 7655, Washington, DC 20375-5352)
Publication:
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 1010, pp. 180-182 (2008). (AIPC Homepage)
Publication Date:
05/2008
Origin:
AIP
PACS Keywords:
X-ray scattering, X-ray binaries, Stellar content and populations; morphology and overall structure
DOI:
10.1063/1.2945033
Bibliographic Code:
2008AIPC.1010..180B

Abstract

Recent analysis of the RXTE X-ray spectra of Sco X-1 discovered that Sco X-1 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. Sco X-1 is the prototypical Z-source low-mass X-ray binary (LMXB) system radiating near the Eddington limit. This radiation produces a high radiation pressure in its Compton cloud. We infer that the radiation pressure produces a geometrical configuration of the cloud that is quasi-spherical. 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, which would likely suppress a spin frequency of Sco X-1 due to photon scattering off cloud electrons. We also demonstrate the evolution of its power spectrum when Sco X-1 transitions from the horizontal branch to the normal branch.
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