Time-dependent radio fine structure of the quasar 3C 345

Details Time-dependent radio fine structure of the quasar 3C 345 Time-dependent radio fine structure of the quasar 3C 345

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..933w&link_type=abstract

Astronomical Journal, vol. 81, Nov. 1976, p. 933-945. Research supported by the Statens Naturvetenskapliga Forskningsrad and Sty

Astronomy and Astrophysics

Astronomy

28

Fine Structure, Quasars, Radio Sources (Astronomy), Angular Distribution, Brightness, Circular Polarization, Flux Density, Interferometry, Mathematical Models, Time Dependence

Scientific paper

Results are reported for VLBI observations of 3C 345 at a wavelength of 3.8 cm with left circular polarization. Sixteen sets of correlated flux densities and three sets of closure phases were obtained from observations made over a three-year period with six independent interferometers formed from up to four antennas. The mathematical models employed to represent the radio brightness distribution of the source are described, and the data are analyzed on the basis of a two-component model. The results show that the compact source in 3C 345 consists of two components whose separation increased by about 0.3 milliarcsec over the observational period, that the smaller and weaker component is to the east and south of the larger and stronger one, and that the apparent expansion velocity would be about 2.5c for a redshift of 0.6, a Hubble constant of 60 km/sec per Mpc, and a deceleration parameter of unity. It is concluded that these findings are difficult to reconcile with the 'Christmas tree' model for the apparent change of separation with time over any given series of observations.

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