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faculty: "FNWI" and publication year: "2005"
| Authors||S. Migliari, R.P. Fender, M. van der Klis|
|Title||Correlation between radio luminosity and X-ray timing frequencies in neutron star and black hole X-ray binaries|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Astronomical Institute Anton Pannekoek (IAP)|
|Keywords||accretion, accretion discs; black hole physics; stars: neutron; ISM: jets and outflows; X-rays: binaries.|
|Abstract||We report on correlations between radio luminosity and X-ray timing features in X-ray binary systems containing low magnetic field neutron stars and black holes. The sample of neutron star systems consists of 4U 1728-34, 4U 1820-34, Ser X-1, MXB 1730-335, GX 13+1, the millisecond X-ray pulsars SAX J1808.4-3658 and IGR J00291+5934, and these are compared with the black hole system GX 339-4. The analysis has been performed using data from pointed observations of the Rossi X-ray Timing Explorer coordinated with radio observations. In the neutron star systems the radio luminosity L<SUB>R</SUB> is correlated with the characteristic frequency of the L<SUB>h</SUB> Lorentzian component detected contemporaneously in the power spectrum, and anticorrelated with its strength. Similarly, in the black hole system GX 339-4 L<SUB>R</SUB> is correlated with the frequency of the L<SUB>l</SUB> component in the power spectrum and anticorrelated with its strength. The index of a power-law fit to the correlation is similar in both cases, L<SUB>R</SUB>~nu<SUP>~1.4</SUP> and L<SUB>R</SUB>~ (rms)<SUP>-2.3</SUP>. At lower timing frequencies, the radio luminosity is further found to be correlated with the characteristic (break) frequency of the L<SUB>b</SUB> component of the power spectra in the neutron stars and, marginally, with the equivalent break frequency in GX 339-4. We briefly discuss the coupling between the innermost regions of the accretion disc and the production of the jet and, from the behaviour of the millisecond accreting X-ray pulsars, the possible role of the neutron star magnetic field.|
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