Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..36m&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #36
Astronomy and Astrophysics
Astrophysics
Scientific paper
A similarity of the jet structures on parsec and kiloparsec scales may testify to the similarity of the propagation velocities of these outflows at different distances from the active nucleus objects. Most quasars and galaxies display strongly collimated jets with lengths of the order of dozens of kiloparsecs, indicating the high velocities of these jets. On the assumption of the synchrotron mechanism of radio emission we derive estimations of the propagation velocities of the jets of radio sources in our sample. Then, we suppose that the jet luminosity has a comparable value with the corresponding kinetic luminosity of the jet. So, from this comparison we have the estimation of the jet velocity. As we found, the jet velocities are subluminal for the sample quasars and galaxies. We consider the relationship between the jet velocity and the physical characteristics from the radio source. In the sample the jet velocities positively correlate with the object redshifts, luminosities in different frequency ranges. Note, that the jet velocities strongly correlate with the linear sizes of the radio sources. The derived relationships provide evidence that younger radio sources have higher velocities of the jet propagation.
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