Statistics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18310003v&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #100.03; Bulletin of the American Astronomical Society, Vol. 25, p.1440
Statistics
Scientific paper
We present an up-to-date compilation of internal proper motion measurements. We demonstrate how their statistics, and those of future large homogeneous samples, may be used to infer the distribution of Lorentz gamma factors, and how superluminal motion statistics may impact AGN unification studies. The current data are derived from inhomogeneous observations, but none-the-less suggest that there is either a wide spread of gamma s in quasars, or that there are separate bulk and pattern gamma s, or both; the simplest model, without separate pattern velocities, and identical or similar gamma in all quasars, is now ruled out. There is a well-defined upper envelope in the mu -z diagram, as indeed predicted by beaming models. Its shape currently suggests that either the universe is closed, or the Lorentz factors increase with redshift. Second-epoch observations of the Caltech-Jodrell VLBI survey are in progress. They will allow a detailed study of the distribution of Lorentz factors in narrow redshift bins, from which evolution of gamma on parsec scales, if any, will be apparent. Thereafter, intercomparison of the statistics between redshift bins will allow q0 to be constrained.
Cohen Morrel H.
Vermeulen Rene C.
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