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

N. M.M. Said, S. P. Ellingsen, S. Shabala, G. Orosz, J. Liu, H. E. Bignall, J. N. Mccallum, C. Reynolds

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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°.

Original languageEnglish
Pages (from-to)2881-2896
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume508
Issue number2
DOIs
Publication statusPublished - 1 Dec 2021
Externally publishedYes

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