The core and halo structure of the quasar 4C 18.68

Details The core and halo structure of the quasar 4C 18.68 The core and halo structure of the quasar 4C 18.68

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..275g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 275-278. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

4

Halos, Quasars, Radio Astronomy, Red Shift, Heao 2, Very Long Base Interferometry

Scientific paper

New VLA observations of the complex low-redshift quasar 4C 18.68, which was previously modeled as a precessing twin-jet source are presented. A 2-cm A configuration map fails to reveal the curvature of the jet near the nucleus predicted by this model. B and C configuration maps have been obtained to study the halo of the source, which is compact and shows no edge-brightened outer lobes. These results suggest that the radio source is not very old, and that it appears to have undergone two major changes of orientation in its less than 10 to the 7th yr history.

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