1642 + 690 - A superluminal quasar

Details 1642 + 690 - A superluminal quasar 1642 + 690 - A superluminal quasar

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300l..25p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. L25-L29.

Astronomy and Astrophysics

Astronomy

21

Quasars, Radio Sources (Astronomy), Very Long Base Interferometry, Astronomical Maps, Radio Spectra, Red Shift

Scientific paper

The radio source 1642 + 690 (4C 69.21) has previously been found to contain a dominant, compact core with a jet extending 5 arcsec to the south. This paper presents two 5 GHz VLBI maps of the core, made in 1980 and 1983, which show that the milliarcsecond structure of the source is similar to that of the well-known superluminal sources 3C 273 and 3C 345. A milliarcsecond jet is closely aligned with the arcsecond jet, and a 'knot' in the jet is moving outwards along the jet at 0.34 mas/yr. It is found that the associated optical object is a quasar with redshift z = 0.75. At this redshift, the displacement of the knot implies an apparent transverse velocity of 9.3/h c (H0 = 100h km/s Mpc, q0 = 0.05).

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