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Additional resources for Black holes : theory and observation : 179. WE-Heraeus Seminar, held a Physikzentrum Bad Honnef, Germany, 18-22 August 1997
E- e+ + (4) - of this conversion photon-photon interaction -2(mec 2)2 (1 - The 511-keV our galaxy occurs in + e+ annihilation proving that real astrophysical the -+ (5) cosa)' energies, m, the electron angle between the photons. interaction possible. -4 is valid: e- is 7 + nucleus and momentum conservation energy El with e+, + -y-ray of the y rest mass, c The inverse the speed of light, process (6) +,y line has been observed pair-production environments. process from the (generation in- of 2. 2 Holes Black Massive Observations The CGROobservations of -y-ray in the Nuclei of Active Galaxies 49 of Garnma-Blazars blazars shown that have these can sources enormously luminous at y-ray energies and at the same time show shortmultiand especially Simultaneous term variability.
To the to Evidence energy is lead of a object. massive The AGNluminosity generated by the release of gravitational energy of field of central The massive a gravitational object. mass of this object can be estimated by the physics of the accretion process. The so-called force Eddington limit describes the balance between the gravitational and the radiation material. If the radiation on the pressure accreting pressure accretion in the Thomson regime dominates, the accretion stops. 3 ::-- - 10 M erg 38 Mo (12) s of 1046 erg/s, its Eddington limit with a luminosity Therefore nuclei of active Mo.
3). There is no commonly accepted interpretation and others not. Whether this has to do with the why some AGNare radio-loud host galaxy radio-loud while sources are mainly found in elliptical galaxies, with the spin of the putative ones in central BH or or radio-quiet spirals one of the something else remains unclear to date. This question is currently major unresolved problems in AGNresearch. model' for AGN, which explains the different Fig. 3 shows the 'standard effect. types as simply being an orientational Despite the fact that many details the scenario are not which is described in the following is yet understood, facts reasonably commonly accepted because it explains the major observational well and consistently.
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