Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9941792l&link_type=abstract
Technical Report, PB99-135980; HUT-MET-28 Metsaehovi Radio Observatory
Other
Radiant Flux Density, Active Galactic Nuclei, Lorentz Force, Doppler Effect, Quasars, Bl Lacertae Objects, Extragalactic Radio Sources, Variability
Scientific paper
We have calculated Doppler boosting factors D(var) for a sample of active galactic nuclei (AGN) using total flux density variation monitoring data at 22 GHz and 37 GHz. We compare our Doppler factors with other results and conclude that even if the average D(var) for a class of sources is very similar to all others, the variability Doppler factors for individual objects are more accurate and reliable. An important application of precise Doppler factors is presented, namely calculating the Lorentz factors Gamma and the viewing angles theta of relativistic outflows in AGN. We find that high polarization quasars are the most Doppler boosted objects while low polarization quasars and BL Lac objects are less boosted. The two groups of quasars show different characteristics due to a different combination of the Lorentz factor and the viewing angle rather than either different Gamma or theta alone.
Laehteenmaeki A.
Valtaoja Esko
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