Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets

Details Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets

2006-11-20

arxiv.org/abs/astro-ph/0611642v1

Astrophys.J.658:232-244,2007

Astronomy and Astrophysics

Astrophysics

12 pages, 9 figures, 1 table, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/511063

Relations between the observed quantities for a beamed radio jet, apparent transverse speed and apparent luminosity (beta_app,L), and the intrinsic quantities, Lorentz factor and intrinsic luminosity (gamma,L_o), are investigated. The inversion from measured to intrinsic values is not unique, but approximate limits to gamma and L_o can be found using probability arguments. Roughly half the sources in a flux density--limited, beamed sample have a value of gamma close to the measured beta_app. The methods are applied to observations of 119 AGN jets made with the VLBA at 15 GHz during 1994-2002. The results strongly support the common relativistic beam model for an extragalactic radio jet. The (beta_app,L) data are closely bounded by a theoretical envelope, an aspect curve for gamma=32, L_o= 10^25 W/Hz. This gives limits to the maximum values of gamma and L_o in the sample: gamma_max about 32, and L_o,max ~ 10^26 W/Hz. No sources with both high beta_app and low L are observed. This is not the result of selection effects due to the observing limits, which are flux density S>0.5 Jy, and angular velocity mu<4 mas/yr. Many of the fastest quasars have a pattern Lorentz factor gamma_p close to that of the beam, gamma_b, but some of the slow quasars must have gamma_p<

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