Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3314k&link_type=abstract
American Astronomical Society, HEAD meeting #11, #33.14; Bulletin of the American Astronomical Society, Vol. 41, p.708
Other
Scientific paper
We have been using the VLBA to observe the outflow in blazer jets with a goal of better understanding the process of acceleration and collimation of relativistic jets and the production of radio and gamma ray emission. We have obtained 2500 images of 250 different blazars and have used the position of bright jet features to characterize the jet flow reaching as close as 0.1 parsecs from the central engine in the more nearby radio galaxies. Typically we have available about 15 different epochs spread over the past 15 years to analyze the motions within each jet. Most jets appear one-sided, likely the result of differential Doppler boosting of an intrinsically symmetric structure. In almost every case, the jet flow appears to be outward with a speed that may be characteristic of each individual jet. However, in more than half of the jets we see changes in speed and/or direction with accelerated motion often found close to the origin followed by decelerated motion further out. In some cases, such as in the gamma-ray loud quasar 3C 279 or the gamma-ray quiet quasar 0738+313, the flow appears to follow a pre-determined curved or twisted trajectory and may not reach its final orientation until it is as much as 1 kpc or more away from the ejection point. However, in other cases, such as the BL Lac Object 1308+326, the initial ejection direction appears to change with time. In some sources, including 3C 273, different components show a variety of accelerated motions. Although, there appears to be a clear association between gamma-ray emission and jet Doppler factors, strong gamma-ray emission is also observed from radio galaxies, including M87 and NGC 1275, that display only subluminal motions.
Kellermann Kenneth I.
Mojave Collaboration
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