Observable properties of accretion disks

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Disk Galaxies, Stellar Mass Accretion, X Ray Sources, Astronomical Models, Astrophysics, Gamma Ray Beams, Plasma-Electromagnetic Interaction, Pulsars, Space Plasmas, X Ray Absorption, X Ray Irradiation

Scientific paper

Astronomical phenomena associated with the accretion of matter onto stars and galaxies are surveyed. The standard disk model from plasma physics is introduced and its modification by X-ray irradiation is discussed. Properties of the accretion disk formed around neutron stars are found from observations of the absorption of X-rays by the accretion disk, radiation emitted from the disk, and the change of the spin periods of X-ray pulsars. The standard model is constructed for the stationary disk, while nonstationary disks can be responsible for transient phenomena including X-ray and gamma-ray bursts.

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