========================================================================== J/A+A/342/378 6 and 20cm flux densities of radio galaxies (Gurvits+ 1999) The following files can be converted to FITS (extension .fit .fgz or .fiZ) table1.dat refs.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=J/A+A/342/378 ==========================================================================
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Beginning of ReadMe : J/A+A/342/378 6 and 20cm flux densities of radio galaxies (Gurvits+ 1999) ================================================================================ The "angular size - redshift" relation for compact radio structures in quasars and radio galaxies Gurvits L.I., Kellermann K.I., Frey S. <Astron. Astrophys. 342, 378 (1999)> =1999A&A...342..378G (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Active gal. nuclei ; QSOs ; Galaxies, radio ; Redshifts ; Radio sources ; VLBI Keywords: galaxies: active - galaxies: quasars: general - cosmology: observations - radio continuum: galaxies Abstract: We discuss the "angular size-redshift" relation for compact radio sources distributed over a wide range of redshifts 0.011<=z<=4.72. Our study is based on a sample of 330 5 GHz VLBI contour maps taken from the literature. Unlike extended source samples, the "angular size - redshift" relation for compact radio sources appears consistent with the predictions of standard Friedmann world models with q_0_= 0.5 without the need to consider evolutionary or selection effects due to a "linear size-luminosity" dependence. By confining our analysis to sources having a spectral index, -0.38<=alpha<=0.18, and a total radio luminosity, Lh^2^>= 10^26^W/Hz (H_0_=100hkm/s/Mpc, q_0_=0.5 used as a numerical example), we are able to restrict the dispersion in the "angular size-redshift" relation. The best fitting regression analysis in the framework of the Friedmann-Robertson-Walker model gives the value of the deceleration parameter q_0_=0.21+/-0.30 if there are no evolutionary or selection effects due to a "linear size-luminosity", "linear size-redshift" or "linear size-spectral index" dependence.
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