Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..371p&link_type=abstract
Astronomical Journal, vol. 86, Mar. 1981, p. 371-385.
Astronomy and Astrophysics
Astronomy
69
Bl Lacertae Objects, Galactic Nuclei, Radio Sources (Astronomy), Radio Spectra, Very Long Base Interferometry, Centimeter Waves, Quasars, Radiant Flux Density, Radio Interferometers
Scientific paper
VLBI observations made at 6-cm wavelength have been used to derive the brightness distribution of the radio emission from three galactic nuclei (M87, 3C 120, and NGC 1275), five quasars (4C 39.25, 3C 273, 3C 279, PKS 2134+004, and 3C 454.3), and two BL Lacertae objects (BL Lac and OJ 287). These observations have sufficient resolution and sensitivity to allow a wide range of surface brightness to be mapped. In four sources (3C 273, 3C 279, 3C 454.3, and BL Lac), the brightness distribution has an asymmetric structure, with one or more bright components and an elongated, jet-like feature. Two of these (3C 273 and 3C 279), as well as 3C 120, show superluminal expansion; in the case of 3C 279, the present data show an extremely high rate of component separation, with an apparent velocity of ∼45c. Comparison with observations at other wavelengths shows that the compact components have inverted or flat spectra, while the more extended ones have the "normal" spectra characteristic of trans- parent sources.
Graham Dave
Kellerman Kenneth I.
Pauliny-Toth I. I. K.
Preuss E.
Ronnang Bernt
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