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Parsec-Scale Morphology of PKS 2152-699 and the Radio/Optical Misalignment


Tingay, SJ and Jauncey, DL and Reynolds, JE and Tzioumis, AK and Migenes, V and Gough, RG and Lovell, JEJ and McCulloch, PM and Costa, ME and Preston, RA and Harbison, P, Parsec-Scale Morphology of PKS 2152-699 and the Radio/Optical Misalignment, The Astronomical Journal, 111, (2) pp. 718-721. ISSN 0004-6256 (1996) [Refereed Article]

DOI: doi:10.1086/117818


We present the first very-long-baseline interferometry (VLBI) image of the parsec-scale structure in the nearby (z=0.0282) Fanaroff-Riley type II radio galaxy PKS 2152-699, revealing the core-jet morphology typical of compact radio sources. Tadhunter et al. [MNRAS, 235, 403 (1988)] have identified this object as one in which the radio axis and optical emission line features on the kiloparsec-scale appear to have an obvious connection but are somewhat misaligned. They interpret this relationship as most likely being due to an interaction between the radio jet and an extra-nuclear cloud of gas, the misalignment possibly caused by the deflection of the radio jet in the interaction. The VLBI observations presented here further strengthen the evidence for the interaction interpretation. The parsec-scale radio jet aligns strongly with optical emission line features, and not with the kiloparsec-scale radio structure. We explore a mechanism which could produce the misalignment and which is consistent with the interaction concept, namely oblique shocks in a relativistic jet. With a minimal model we find that reasonable values of the model parameters can provide the required misalignment over a wide range of initial conditions. © 1996 American Astronomical Society.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
UTAS Author:McCulloch, PM (Professor Peter McCulloch)
ID Code:36
Year Published:1996
Web of Science® Times Cited:13
Deposited By:Physics
Deposited On:1996-08-01
Last Modified:2011-08-15

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