Evidence for Jet Acceleration on 10-100 Pc Scales in Lobe-dominated Quasars

Details Evidence for Jet Acceleration on 10-100 Pc Scales in Lobe-dominated Quasars Evidence for Jet Acceleration on 10-100 Pc Scales in Lobe-dominated Quasars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543417p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #434.17; Bulletin of the American Astronomical Society, Vol. 42, p.377

Astronomy and Astrophysics

Astronomy

Scientific paper

We imaged milliarcsecond-scale radio jets in six lobe-dominated quasars (LDQs) from 1995 to 2008 using the NRAO VLBA at 8.4 GHz (and 15 GHz in some cases). These observations have been sufficiently frequent to unambiguously identify and track multiple jet components. There is a correlation between apparent jet speed and projected core distance in these LDQs at greater than 99 per cent confidence levels (Hough 2008, ASP Conf. Series, 386, 274)). Four sources show this effect particularly strongly. We have followed only one component long enough to measure its acceleration directly. But we have sampled apparent speed vs. projected distance rather well by close observation of multiple components in each source. On the simple assumption of a unique velocity profile followed by all components in a given source, this allows us to study component motion on an effective timescale of approximately 20-50 years. Results for 3C207 and 3C263 show an excellent fit using a constant acceleration model. The cause of such acceleration on 10-100 pc scales is not certain, but "magnetic acceleration” by a gradient in magnetic field pressure is one possibility (Vlahakis and Konigl 2004, ApJ, 605, 656). NRAO is a facility of the NSF operated under cooperative agreement by AUI.

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