Estimating q_0 from angular size statistics

Details Estimating q_0 from angular size statistics Estimating q_0 from angular size statistics

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272l..13s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 3, pp. L13-L15.

Astronomy and Astrophysics

Astronomy

10

Methods, Statistical-Cosmology, Miscellaneous-Radio Continuum, Galaxies.

Scientific paper

Compact radio sources, being relatively small (parsec-scale) and short-lived, are likely to be little affected by evolutionary changes, and are therefore good probes of the angular size-redshift relation. Kellermann has analysed a sample of 82 compact radio sources and finds that they are consistent with q_0=1/2. We develop a likelihoods method for analysing angular size data without having to bin them, and apply the method to an updated version of Kellermann's sample. From this analysis we argue that, while the angular size data are consistent with q_0=1/2, they do not at present rule out extreme values such as q_0~5.

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