Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.308..617a&link_type=abstract
Nature (ISSN 0028-0836), vol. 308, April 12, 1984, p. 617-619.
Astronomy and Astrophysics
Astronomy
19
Bl Lacertae Objects, Blazars, Quasars, Radio Astronomy, Radio Sources (Astronomy), Spectral Energy Distribution, Astronomical Maps, Optical Polarization, Periodic Variations, Point Sources, Radio Spectra, Relativistic Velocity
Scientific paper
The relevant properties of the blazars having extended double sources are reviewed, and the discovery of further normal double sources in objects whose cores demonstrate evidence for bulk relativistic motion near the line of sight is reported. Radio frequency contour maps and discussion of the following blazars are provided: PKS0736+017, MC31522+155, PKS2208-137, and PKS0548-322. The first three are clear double radio sources around strong central point sources (two almost symmetrical and one classical). PKS0548-322 exhibits tail-head morphology and shows a linear structure somewhat separated from the eastern tail by an area of low surface brightness. Other observations of PKS0548-322 include the lack of emission lines, and a trail at least 49 arc s long. It is concluded that jets may not lie exactly along the line of sight, or that the lobes are misaligned with the jets.
Antonucci Robert R. J.
Ulvestad James S.
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