The possible nature of quasars in a compact model for the Universe

Details The possible nature of quasars in a compact model for the Universe The possible nature of quasars in a compact model for the Universe

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..567r&link_type=abstract

Astronomy Reports, Volume 42, Issue 5, September 1998, pp.567-575

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The gravitational focusing of light rays in a compact model for the Universe is considered. In a compact space, light can return to its source. Therefore, it is proposed that light rays emitted by a young, hot galaxy can return and be focused in the nuclear region of the galaxy, due to gravitational lensing by density inhomogeneities, such as clusters of galaxies. The analysis takes into account changes in the frequency and flux density of the emitted radiation due to the cosmological expansion of space and to the gravitation of giant density inhomogeneities (beats), which may consist of several superclusters of galaxies. It is shown that the energy flux of the returning radiation decreases more slowly than the flux from a source in a uniform and isotropic model. Because of the expansion of space, the ultraviolet radiation of the galaxy at the epoch of the return of the radiation becomes infrared. Due to the focusing effect, the flux of infrared photons is so large that they rapidly heat the plasma in the galactic nucleus to relativistic temperatures of the order of 10^12 K. Further heating results from induced Compton scattering on the electrons of the plasma. Compton scattering of the infrared emission on the hot electrons then transforms this emission into optical, ultraviolet, and X-ray radiation. As a result, a `Compton reactor' forms in the nucleus of the galaxy. In this region, the processes of heating of the plasma by incident infrared radiation and cooling of the plasma by the transformation of the incident infrared radiation into higher- frequency radiation by hot electrons are dynamically balanced. The luminosity of the reactor is two to three orders of magnitude lower than the luminosity of the young galaxy. The radiation of the reactor has a characteristic power-law spectrum. Its properties as a bright, variable nucleus resemble those of quasars or the nuclei of active galaxies.

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