Relativistic Flows in Astrophysics

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  • Relativistic Flows in Astrophysics Book Detail

  • Author : A.W. Guthmann
  • Release Date : 2008-01-11
  • Publisher : Springer
  • Genre : Science
  • Pages : 252
  • ISBN 13 : 354046025X
  • File Size : 88,88 MB

Relativistic Flows in Astrophysics by A.W. Guthmann PDF Summary

Book Description: 1. 1 Schematic Picture of AGN Some galaxies are known to emit radiation with extremely high luminosities from a rather small volume in the ??ray, X-ray and UV continuum. Such active cores are the so-called Active Galactic Nuclei (AGN) and the radiation is commonly believed to be a result of gravitational energy released by matter spiraling around 9 a supermassive central black hole of about 10 M (see Fig. 1). Though the central engine which produces the enormous observed activity cannot be resolved observationally, a standard picture of an AGN has gradually emerged to explain the richness of the radiation spectra: • an accretion disk with radius from about 2 to 100 gravitational radii, R , g feeding the central black hole and emitting mainly in the UV and soft X-rays; • the broad line optically emitting clouds (BLR), which seem to be absent in 3 some sources (e. g. FRI, see hereafter) and extend up to a few 10 R from g the center.

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