Search Publications

Quasi-Periodic Oscillations in Low-Mass X-ray Binaries

van der Klis, M.

Strong, persistent, high-frequency QPO (quasi-periodic oscillations) have been discovered with EXOSAT in seven luminous, persistently bright low-mass X-ray binaries. The detailed properties of these QPO, in particular their dependence on source intensity, are discussed. A large variety is observed in the relations between source intensity and QPO …

The Soft X-ray Spectra of Active Galactic Nuclei

Branduardi-Raymont, G.

EXOSAT LE and ME data on Seyfert 1 galaxies and quasars are reviewed: the observations indicate that a strong flux of soft X-rays, in excess of the power-law continuum that extends over most of the spectrum, is a common feature of the emission of active galactic nuclei (AGN). This low-energy X-ray spectral component, which is often identified with…

X-ray Spectral Formation in Low Mass X-ray Binaries

White, N. E.

The spectral properties of the non-pulsing low mass X-ray binaries are reviewed using recent EXOSAT observations. The spectra of the persistent emission from a sample of the lower luminosity, 10³⁷erg/s systems (usually X-ray burst sources), are well modelled by a simple power law attenuated at high energies by an exponential cutoff. The…