X-rays from quasars and active galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galaxies, Astronomical Spectroscopy, Galactic Nuclei, Galactic Radiation, Quasars, X Ray Astronomy, Black Holes (Astronomy), Electron-Positron Pairs, Gas Flow, Luminosity, Nonthermal Radiation, Pair Production, Temporal Resolution

Scientific paper

Some of the most important theoretical ideas and observations for quasars and the nuclei of active galaxies are reviewed, and areas of future research are suggested. Emphasis is on the nature of the power source, the radiation processes, and the mechanism for formation and collimation of jets. Phenomena that produce X-rays are of particular concern. Particular topics discussed are the observed and expected time variabilility, the gas supply mechanisms and luminosity evolution, thermal and nonthermal radiation processes, observed and theoretical spectra, criteria for thermalization of electrons and ions, effects of electron-positron pairs on relativistic plasmas, hydrodynamic, electrodynamic and inertial methods for producing and confining jets. The paper concludes with a list of needed observations.

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