Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..534b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Sept. 1986, p. 534-545.
Astronomy and Astrophysics
Astronomy
48
Collimation, Linear Polarization, Plasma Jets, Radio Galaxies, Astronomical Maps, Astronomical Spectroscopy, Galactic Nuclei, Magnetic Fields
Scientific paper
New 4885 MHz VLA maps of the powerful radio galaxy 3C 219 show that the transverse width of its brighter radio jet does not grow significantly between 13 and 35 kpc from its nucleus. An elongated radio knot that is probably part of a counterjet has been discovered. The apparent magnetic field structure of the brighter jet has been mapped at higher resolution than before. The field is well organized, and its mean apparent direction is near the major axis of elongation of the jet over most of the jet's length. Some deviations from this mean direction are systematic, and the largest deviations occur at regular intervals along the jet. The spreading (i.e., lateral expansion) rate of the jet cannot have been constant with distance from the core. If the spreading rate of the synchrotron emission reflects that of an underlying flow, the flow cannot be freely expanding. It is unlikely that the jet is thermally confined by hot gas that is bound to 3C 219 alone, but it may be thermally confined by gas that is bound to the surrounding cluster of galaxies.
Bridle Alan H.
Henriksen Richard N.
Perley Richard A.
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