Parsec-scale radio structures in quasars and AGN as a tool for measuring cosmological parameters

Details Parsec-scale radio structures in quasars and AGN as a tool for measuring cosmological parameters Parsec-scale radio structures in quasars and AGN as a tool for measuring cosmological parameters

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.148g&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We discuss the ``angular size - redshift'' relation for compact radio sources distributed over a wide range of redshifts 0.01 <= z <= 4.72 as a tool for cosmological tests. Our study is based on a sample of 330 extragalactic radio sources, mostly quasars, observed with VLBI primarily at 5 GHz, but includes a smaller sub-sample observed at 15 GHz as well. By confining our analysis to sources with a spectral index, -0.4 <= alpha <= 0.2, and a total radio luminosity, Lh2 >= 1026 W/Hz, we 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 qcirc = 3D 0.21 +- 0.30 if there are no evolutionary or selection effects (i.e., no linear size dependence on luminosity, redshift or spectral index). With our sample, we are also investigating the constraints for Friedmann models with a cosmological constant Lambda not equal to 0.

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