Investigating the evolution of PKS B1144−379: comparison of VLBI and scintillation techniques | Zendy

N. M. M. Said | Zendy; S. P. Ellingsen | Zendy; Stanislav S. Shabala | Zendy; Gábor Orosz | Zendy; J Liu | Zendy; Hayley Bignall | Zendy; James L. McCallum | Zendy; Cormac Reynolds | Zendy

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

Author(s) -

N. M. M. Said,

S. P. Ellingsen,

Stanislav S. Shabala,

Gábor Orosz,

J Liu,

Hayley Bignall,

James L. McCallum,

Cormac Reynolds

Publication year - 2021

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/stab2724

Subject(s) - very long baseline interferometry , physics , bl lac object , astrophysics , scintillation , radio telescope , telescope , astronomy , position angle , flux (metallurgy) , jet (fluid) , interferometry , blazar , optics , galaxy , gamma ray , detector , materials science , metallurgy , thermodynamics

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°.

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