Mathematics – Probability
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20923902c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #239.02; Bulletin of the American Astronomical Society,
Mathematics
Probability
Scientific paper
A 15-GHz VLBA survey of 119 compact extragalactic radio jets has yielded accurate values of apparent transverse velocity, β (units of c), and apparent luminosity, L. A plot on the (β, L) plane shows the 119 points closely bounded by an aspect curve, which is the track of (β, L) for a source when the aspect (angle to the LOS) is changed. From the parameters of this envelope the maximum Lorentz factor in the sample is estimated at Γ 32, and the maximum intrinsic luminosity is estimated at 10E26 W/Hz. Probability arguments show that there are too many low-speed (β<3) quasars in the sample, and in some of them the pattern speed must be less than the beam speed. Three of the 10 galaxies in the sample show superluminal motion and have values of Γ up to 6, but the others are only mildly relativistic. They are not off-axis versions of the powerful quasars. Cygnus A may be an exception. It has a weak subluminal jet in spite of its powerful lobes. and we suggest that it has a "spine-sheath" structure, with a fast off-axis jet that is deboosted and not seen from our direction. This work shows that the common model for a compact extragalactic jet, that the beam is relativistic and that the fastest moving component has about the same velocity as the beam, is valid for many sources.
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