Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..561p&link_type=abstract
Astronomy Reports, Volume 43, Issue 9, September 1999, pp.561-571
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We have performed a statistical analysis of published data for a VLBI survey of a sample of compact extragalactic radio sources carried out in 1994 and 1995 at 2.32 and 8.55 GHz. The aim of this survey was to investigate the effect of source radio structure on the accuracy of determining astrometrical coordinates. The radio images of 94 quasars with known redshifts are analyzed. Using the dependence of the angular size of the core components on redshift, the deceleration parameter is estimated for a uniform, isotropic Universe with zero cosmological constant (q_0 = 0.5 +/- 0.15). The observed brightness temperatures for the core components are confined to the interval 10121013 K; the upper boundary to the distribution is very sharp. The distribution of spectral indices for various components in the radio images and the distribution of relative component sizes at 2.32 and 8.55 GHz are also analyzed. The magnetic-field strength near the core region is estimated in the framework of a Blandford-Konigl relativistic-jet model (B >= 0.1 G). The brightness temperatures of the jet components vary with distance from the core according to a power law with index -2.43. The relation between the total radio fluxes in the VLBI images and integrated fluxes observed using the RATAN-600 radio telescope is discussed.
Kovalev Yu. Yu.
Popov Michail V.
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