The ``angular size - redshift'' relation for compact radio structures in quasars and radio galaxies

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dc.creatorGurvits, L. I.
dc.creatorKellermann, K. I.
dc.creatorFrey, S.
dc.date1998-12-01
dc.date.accessioned2026-07-07T02:29:24Z
dc.date.available2026-07-07T02:29:24Z
dc.descriptionWe discuss the ``angular size - redshift'' relation for compact radio sources distributed over a wide range of redshifts 0.01 < z < 4.73. 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_o ~ 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 greater than 10^{26} W/Hz, 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_o = 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.
dc.description21 pages, 2 tables (one large multipage), 10 figures. To appear in Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9812018
dc.identifierhttp://arxiv.org/abs/astro-ph/9812018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13461
dc.subjectAstrophysics
dc.titleThe ``angular size - redshift'' relation for compact radio structures in quasars and radio galaxies
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