Exploring the properties of milliarcsecond radio sources

Abstract

Cosmological applications of the "redshift - angular size" test require knowledge of the linear size of the "standard rod" used. In this paper, we study the properties of a large sample of 140 milliarcsecond compact radio sources with flux densities measured at 6 cm and 20 cm, compiled by Gurvits et al.(1999). Using the best-fitted cosmological parameters given by Planck/WMAP9 observations, we investigate the characteristic length $l_m$ as well as its dependence on the source luminosity $L$ and redshift $l_m=l{L}^{\beta }(1+z{)}^n$. For the full sample, measurements of the angular size $\theta$ provide a tight constraint on the linear size parameters. We find that cosmological evolution of the linear size is small ($|n|\simeq 10^{-2}$) and consistent with previous analysis. However, a substantial evolution of linear sizes with luminosity is still required ($\beta \simeq 0.17$). Furthermore, similar analysis done on sub-samples defined by different source optical counterparts and different redshift ranges, seems to support the scheme of treating radio galaxies and quasars with distinct strategies. Finally, a cosmological-model-independent method is discussed to probe the properties of angular size of milliarcsecond radio quasars. Using the corrected redshift - angular size relation for quasar sample, we obtained a value of the matter density parameter, ${\Omega }_m=0.292_{-0.090}^{+0.065}$, in the spatially flat $\Lambda$CDM cosmology.

8 pages, 6 figures, Accepted for publication in ApJ

References in corpus (3)

• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Testing Models of Radio Galaxy Evolution and the Cosmological Impact of FR II Radio Galaxies
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