Statistics – Computation
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184...79c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 79-85. CNPq-supported research.
Statistics
Computation
Confinement, Extragalactic Radio Sources, Faraday Effect, Flux Density, Galactic Mass, Galactic Nuclei, Computational Astrophysics, Cygnus Constellation
Scientific paper
Confinement mechanisms of extragalactic radio sources are reviewed and different observational constraints are studied. General expressions are obtained for the maximum flux density as a function of the source angular size, which is allowed by considering thermal absorption, X-ray emission and Faraday effects. Extended and compact sources are analysed. Numerical computation and comparison with a large sample of sources show that ram pressure containment is more likely to work than other mechanisms for extended sources. A general analysis also shows that ram pressure is unlikely to work for most of the compact sources as extremely high densities are required. In the particular case of sources which suffer Doppler enhancement due to relativistic beaming effect, less severe constraints on confinement mechanisms exist.
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