Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221...41w&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, Apr. 1, 1978, p. 41-50.
Astronomy and Astrophysics
Astronomy
27
Astronomical Models, Galactic Radio Waves, Galactic Structure, Radio Sources (Astronomy), Galactic Nuclei, Relativistic Plasmas, Steady State, Very Long Base Interferometry
Scientific paper
Continuous ejection models for extragalactic symmetric double radio sources are discussed, with emphasis on the twin-exhaust proposal of Blandford and Rees, since it accounts for the data reasonably well. Their steady-state model is refined through the introduction of parameters related to constraints imposed by the observations (optical, radio, and X-ray). We construct models for Cygnus A that have considerably more compact inner regions than those of Blandford and Rees, and we argue that our version may provide a more natural explanation of the alignment between inner and outer radio emission regions. Our models require a hotter, denser, confining gas housed within a galactic nucleus; the nucleus is assumed to supply the energy and plasma for the entire double source. Suggestions for further relevant observations are made.
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