Produktnummer:
18fbd30e5b9acc4923ae12293fc82f819a
| Themengebiete: | active galactic nuclei astrophysical jets astrophysics gamma-ray bursts particle acceleration relativistic hydrodynamics |
|---|---|
| Veröffentlichungsdatum: | 04.12.2010 |
| EAN: | 9783642078040 |
| Sprache: | Englisch |
| Seitenzahl: | 246 |
| Produktart: | Kartoniert / Broschiert |
| Herausgeber: | Georganopoulos, M. Guthmann, A.W. Manolakou, K. Marcowith, A. |
| Verlag: | Springer Berlin |
Produktinformationen "Relativistic Flows in Astrophysics"
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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