Statistics – Applications
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pnas...9211385v&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 92, Issue 25, pp. 11385-11389
Statistics
Applications
26
Scientific paper
Predictions for the apparent velocity statistics under simple beaming models are presented and compared to the observations. The potential applications for tests of unification models and for cosmology (source counts, measurements of the Hubble constant H_0 and the deceleration parameter q_0) are discussed. First results from a large homogeneous survey are presented. The data do not show compelling evidence for the existence of intrinsically different populations of galaxies, BL Lacertae objects, or quasars. Apparent velocities βapp in the range 1-5 h-1, where h = H_0/100 km.s-1.Mpc-1 [1 megaparsec (Mpc) = 3.09 x 1022 m], occur with roughly equal frequency; higher values, up to βapp = 10 h-1, are rather more scarce than appeared to be the case from earlier work, which evidently concentrated on sources that are not representative of the general population. The βapp distribution suggests that there might be a skewed distribution of Lorentz factors over the sample, with a peak at γ_b ≈ 2 h-1 and a tail up to at least γ_b ≈ 10 h-1. There appears to be a clearly rising upper envelope to the βapp distribution when plotted as a function of observed 5-GHz luminosity; a combination of source counts and the apparent velocity statistics in a larger sample could provide much insight into the properties of radio jet sources.
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