Two new candidate superluminal quasars - 4C 28.45 and 4C 21.35

Details Two new candidate superluminal quasars - 4C 28.45 and 4C 21.35 Two new candidate superluminal quasars - 4C 28.45 and 4C 21.35

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261....5h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 5-8.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Interferometry, Quasars, Galactic Structure, Very Long Base Interferometry

Scientific paper

Multiepoch VLBI observations are presented of two large double-lobed quasars, 4C 28.45 (1830 + 285) and 4C 21.35 (1222 + 216). On mas-scales, both quasars contain a multicomponent asymmetric radio structure. In 4C 28.45 the nuclear emission was seen to expand, the observed proper motions corresponding to an apparent expansion velocity of (3.0 +/- 0.8)c. In the case of 4C 21.35, the evidence for superluminal motion is less strong; the data are compatible with an apparent expansion velocity of (1.6 +/- 0.6)c.

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