Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..408l&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 408-412.
Astronomy and Astrophysics
Astronomy
20
Astronomical Models, Black Holes (Astronomy), Galactic Nuclei, Radio Galaxies, Beams (Radiation), Collimation, Gravitational Effects, Orbital Elements, Point Sources, Red Shift
Scientific paper
The radio source 3C 449 contains a point source with two radio jets extending from it and is associated with a cD galaxy at redshift z=0.0181. Both jets undergo periodic oscillations in position angle as a function of radius from the point source. The whole configuration shows a reflection symmetry about an axis through the point source and therefore could not be explained by a precessing beam model. The proposed model is that of a massive object orbiting about 1 kpc from the center of the cD galaxy and emitting twin beams, with V(beam) approximately equal to 6.25 V(orb). It is this periodic orbital velocity component added to the beam velocity which produces the observed beam oscillations and explains the observed mirror symmetry of the beams. The predicted beam velocity is in agreement with independent radio determinations. Since cD galaxies often have multiple nuclei and may be the result of galaxy mergers, finding a massive object 1 kpc from the center would be quite plausible.
Gott Richard J. III
Lupton Robert H.
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