Computer Science
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..33420378g&link_type=abstract
VizieR On-line Data Catalog: J/A+A/342/378. Originally published in: 1999A&A...342..378G
Computer Science
Active Gal. Nuclei, Qsos, Galaxies: Radio, Redshifts, Radio Sources, Vlbi
Scientific paper
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 q0=~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<=α<=0.18, and a total radio luminosity, Lh2>= 1026W/Hz (H0=100hkm/s/Mpc, q0=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 q0=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. (2 data files).
Frey Sabine
Gurvits Leonid I.
Kellermann Kenneth I.
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