The parsec-scale evolution of the superluminal quasar 1642+690.

Details The parsec-scale evolution of the superluminal quasar 1642+690. The parsec-scale evolution of the superluminal quasar 1642+690.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..484v&link_type=abstract

Astronomy and Astrophysics, v.325, p.484-492

Astronomy and Astrophysics

Astrophysics

2

Galaxies: Active, Quasars: General, Radio Continuum: Galaxies, Quasars: Individual: Q 1642+690

Scientific paper

We present the results of a 6 cm VLBI monitoring program of the core dominated, radio loud quasar 1642+690. 3.6 cm VLBI observations are also presented. The 6 cm observations, carried out in 1986.4, 1988.2, 1992.2 and 1994.7 confirm that the source is variable, both in morphology and in flux density, its changes reflecting a complicated evolution. We propose a few evolutionary scenarios, and favour the interpretation of the superluminal character of 1642+690, with a flow of superluminal components ejected from the core at a very similar high apparent speed, β_app_~9, in agreement with the first claim of superluminal motion in this source.

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