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Investigating the evolution of PKS B1144-379: comparison of VLBI and scintillation techniques

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Said, NMM, Ellingsen, SP ORCID: 0000-0002-1363-5457, Shabala, S ORCID: 0000-0001-5064-0493, Orosz, G ORCID: 0000-0002-5526-990X, Liu, J, Bignall, HE, McCallum, JN ORCID: 0000-0002-0233-6937 and Reynolds, C 2021 , 'Investigating the evolution of PKS B1144-379: comparison of VLBI and scintillation techniques' , Monthly Notices of the Royal Astronomical Society, vol. 508, no. 2 , pp. 2881-2896 , doi: 10.1093/mnras/stab2724.

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Abstract

We have investigated the evolution of the BL Lac object PKS B1144-379 using the University of Tasmania Ceduna 30-m radio telescope at a frequency of 6.7 GHz and very long baseline interferometry (VLBI) data at 8.6 GHz. Variability time-scales associated with two flares detected in 2005 November and 2008 August were derived from long-term variations in total flux density monitored by Ceduna between 2003 and 2011. A kinematic study of the parsec-scale jet of PKS B1144-379 was performed using VLBI data obtained between 1997 and 2018. Quasi-periodic flarings with a period of ∼3-4 yr were observed. Over the 20-yr interval, the average jet position angle was found to be ∼150°.

Item Type: Article
Authors/Creators:Said, NMM and Ellingsen, SP and Shabala, S and Orosz, G and Liu, J and Bignall, HE and McCallum, JN and Reynolds, C
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/stab2724
Copyright Information:

Copyright 2021 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©2021 The Authors. Published by Oxford University Press on behalf on the Royal Astronomical Society. All rights reserved.

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