5 papers
Correlations between X-ray Spectral Characteristics and Quasi-Periodic Oscillations in Sco X-1
Charles F. Bradshaw, Lev Titarchuk, Sergey Kuznetsov
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, 4…
B-field Determination from Magnetoacoustic Oscillations in kHz QPO Neutron Star Binaries: Theory and Observations
L. G. Titarchuk, C. F. Bradshaw, K. S. Wood
We present a method for determining the B-field around neutron stars based on observed kHz and viscous QPO frequencies used in combination with the best-fit optical depth and tempe…
Normal Branch Quasi-Periodic Oscillations in Sco X-1: Viscous Oscillations of a Spherical Shell Near the Neutron Star
L. Titarchuk, C. F. Bradshaw, B. J. Geldzahler +1
We present a comprehensive classification of all observed QPOs within the framework of the transition layer model using a large set of Rossi X-ray Timing Explorer (RXTE) data for S…
Sco X-1: The Evolution and Nature of the Twin Compact Radio Lobes
E. B. Fomalont, B. J. Geldzahler, C. F. Bradshaw
The radio components associated with the LMXB Sco X-1 have been monitored with extensive VLBI imaging at 1.7 and 5.0 GHz over four years, including a 56-hour continuous VLBI observ…
Sco X-1: Energy Transfer from the Core to the Radio Lobes
E. B. Fomalont, B. J. Geldzahler, C. F. Bradshaw
The evolution of the radio emission from Sco X-1 is determined from a 56-hour continuous VLBI observation and from shorter observations over a four-year period. The radio source co…