Kiloparsec-scale Jets In The 3cr Lobe-dominated Quasars

Details Kiloparsec-scale Jets In The 3cr Lobe-dominated Quasars Kiloparsec-scale Jets In The 3cr Lobe-dominated Quasars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915426j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #154.26

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Scientific paper

We are investigating the physics of kiloparsec-scale jets in a complete sample of lobe-dominated quasars (LDQs). Previously, Bridle et al. (1994, AJ, 108, 766) reported results for 13 of 21 LDQs in a well-defined 3CR complete sample. Here, we add results for the other 8 LDQs, and present new analyses for all 21 sources. No new counterjets were detected, leaving the number of counterjet candidates at 7. The jet/counterjet brightness ratio J ranges from 1.2:1 to >1750:1. Many jets have quasiperiodic trains of knots. The first jet knot is often the brightest. Two key correlations in Bridle et al. are confirmed here: (1) the prominences (normalized brightnesses) of the parsec-scale and kiloparsec-scale jets are highly correlated (99.9% confidence); and (2) the prominence of the kpc jet terminal hot spots is anti-correlated with jet bending angle (99% confidence, but largely dependent on just 3 sources). The first correlation strongly suggests relativistic motion on both pc and kpc scales. The slope of the log prominence correlation ( 0.75) is consistent with deceleration on kpc scales, with a range of Lorentz factor centered on 3. Further, the distribution of J does not require Lorentz factor > 3. The second correlation suggests that highly-bent kpc jets are less able to form powerful hot spots. Future work will explore velocity fields in the kpc jets, and revisit inverse Compton models for their X-ray emission.
This work was supported in part by an AAS Small Research Grant.

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