Physics – Plasma Physics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996plas.work..137g&link_type=abstract
Proceedings of the Fourth Brazilian Meeting on Plasma Physics and the Sixth Brazilian Plasma Astrophysics Workshop, p. 137
Physics
Plasma Physics
Magnetohydrodynamic Waves, Quasars, Thermal Instability, Wave-Particle Interactions, Heating, Cooling, Normal Shock Waves, Plasma Waves
Scientific paper
In previous works, we have determined the criterion for the formation of the broad emission-line clouds (BLR) of quasars, for two-phase equilibrium of the BLR due to thermal instability, in the presence of Alfvenic Heating (Goncalves et al. 1993, 1996). Now, we're particularly interested in the temporal evolution of the thermally unstable regions determined previously. Other authors have estudied the hydrodynamical evolution of this region, concluding that it would be necessary to assume initial perturbations implausibly large in order to form the BLR clouds via a thermal instability. It means that the perturbations which permit the formation of these clouds in time scales smaller than the dynamical time (approximately 30 years) are extremely large. As the time scales related with cloud formation (such as dynamical and cooling times) depend on the heating-cooling function, evolutive models, in the BLR of quasars, which include Alfvenic heating, are investigated.
Friaça Amâncio C. S.
Goncalves Denise R.
Jatenco-Pereira Vera
Opher Reuven
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