Recent Observations of X-Ray Emission from Galactic Binary Neutron Stars

Abstract

Recent measurements of young accreting binary neutron stars are determining more precise magnetic field and accretion parameters. A low magnetic field accreting, millisecond pulsar has finally been found in a binary burster. At least 20 low-mass binaries have exhibited high frequency oscillations, 300--1200 Hertz. The majority have, for some range of luminosity, the pair of quasiperiodic oscillations that have never been seen in a black hole candidate. Recent evidence from burst oscillations strengthens the case that the difference frequency of this pair is close to the spin frequency of the neutron star. These oscillations are correlated with the spectra, luminosity, and low frequency oscillations. Quasiperiodic oscillations are also seen sometimes in strong magnetic field pulsars, where their origin can be closely examined.

arXiv comment10 pages, 3 figures, to appear in "IAU Symposium 195: Highly Energetic Physical Processes and Mechanisms for Emission from Astrophysical Plasmas", ed. P. C. H. Martens, S. Tsuruta, and M. A. Weber, (San Francisco: ASP)

References in corpus (14)

• Lense-Thirring Precession and QPOs in Low Mass X-Ray Binaries
• Sonic-Point Model of Kilohertz Quasi-Periodic Brightness Oscillations in Low-Mass X-ray Binaries
• kHz Quasi Periodic Oscillations in Low Mass X-ray Binaries as Probes of General Relativity in the Strong Field Regime
• The two-hour orbit of a binary millisecond X-ray pulsar
• Neutron Star Masses and Radii as Inferred from kilo-Hertz QPOs
• Strong Correlation Between Noise Features at Low Frequency and the Kilohertz QPOs in the X-Ray Binary 4U 1728-34
• Discovery of a Third Harmonic Cyclotron Resonance Scattering Feature in the X-ray Spectrum of 4U 0115+63
• Cyclotron Line Variability
• On the Frequency Evolution of X-ray Brightness Oscillations During Thermonuclear X-ray Bursts: Evidence for Coherent Oscillations
• Strong Field Gravity and X-Ray Observations of 4U1820-30
• Evidence for Antipodal Hot Spots During X-ray Bursts From 4U 1636-536
• Timing Spectroscopy of Quasi-Periodic Oscillations in the Low-Mass X-ray Neutron Star Binaries
• Measurement of Hard Lags and Coherences in the X-Ray Flux of Accreting Neutron Stars and Comparison with Accreting Black Holes
• Sidebands Due to Quasi-periodic Oscillations in 4U 1626-67