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2003ApJ...588..716P - Astrophys. J., 588, 716-730 (2003/May-2)
The speed and orientation of the parsec-scale jet in 3C 279.
PINER B.G., UNWIN S.C., WEHRLE A.E., ZOOK A.C., URRY C.M. and GILMORE D.M.
Abstract (from CDS):
The conical jet model can be made to match both the observed X-ray emission and the VLBI properties of the core with a suitable choice of Doppler factor, implying that the core makes a significant contribution to the X-ray emission, in contrast to the situation for 3C 345, where the jet components dominated the X-ray emission. The parameters of the Königl models indicate that the jet is particle dominated at the radii that produce significant emission (from ∼5 to 20 pc from the apex of the jet for most models) and is not in equipartition. At the inner radius of the Königl jet the magnetic field is of order 0.1 G and the relativistic-particle number density is of order 10 cm–3. The kinetic energy flux in the jet is of order 1046(1+k) ergs/s, where k is the ratio of proton to electron energy, which implies a mass accretion rate of order 0.1(1+k)/ηM☉yr–1, where η is the efficiency of conversion of mass to kinetic energy.
When all components are included in the calculation, then on average the core produces about half of the X-rays, with the other half being split between the long-lived component C4 and the brightest inner-jet component. We calculate an average speed and angle to the line of sight for the region of the jet interior to 1 mas of v=0.992c (γ=8) and θ=4° and an average speed and angle to the line of sight for C4 (at r~3 mas) of v=0.997c (γ=13) and θ=2°. These values imply average Doppler factors of δ=12 for the inner jet and δ=21 for C4.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Active - Galaxies: Jets - Galaxies: Quasars: Individual: Alphanumeric: 3C 279 - Radiation Mechanisms: Nonthermal - Radio Continuum: Galaxies
Simbad objects: 9
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