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  • Faculty of Design and Creative Technologies (Te Ara Auaha)
  • School of Engineering, Computer and Mathematical Sciences - Te Kura Mātai Pūhanga, Rorohiko, Pāngarau
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Unprecedented Change in the Position of Four Radio Sources

Titov, O; Frey, S; Melnikov, A; Lambert, S; Shu, F; Xia, B; Gonzalez, J; Tercero, B; Gulayev, S; Weston, S; Natusch, T
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http://hdl.handle.net/10292/15400
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Abstract
Astrometric positions of radio-emitting active galactic nuclei (AGNs) can be determined with sub-milliarcsec accuracy using very long baseline interferometry (VLBI). The usually small apparent proper motion of distant extragalactic targets allow us to realize the fundamental celestial reference frame with VLBI observations. However, long-term astrometric monitoring may reveal extreme changes in some AGN positions. Using new VLBI observations in 2018–2021, we show here that four extragalactic radio sources (3C 48, CTA 21, 1144+352, 1328+254) have a dramatic shift in their positions by 20–130 mas over two decades. For all four sources, the apparent positional shift is caused by their radio structure change.
Keywords
Astrometry; Astronomy & Astrophysics; Galaxies: Active; Galaxies: Jets; JET; KINEMATICS; OPTICAL-IDENTIFICATION; Physical Sciences; PROPER MOTIONS; QUASARS; Radio continuum: Galaxies; REFERENCE FRAME; Reference systems; SAMPLE; Science & Technology; VLA
Date
2022
Source
Monthly Notices of the Royal Astronomical Society, Volume 512, Issue 1, May 2022, Pages 874–883, https://doi.org/10.1093/mnras/stac038
Item Type
Journal Article
Publisher
Royal Astronomical Society
DOI
10.1093/mnras/stac038
Publisher's Version
https://academic.oup.com/mnras/article/512/1/874/6548138
Rights Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 Oleg Titov, Sándor Frey, Alexey Melnikov, Sébastien Lambert, Fengchun Shu, Bo Xia, Javier González, Belén Tercero, Sergey Gulayev, Stuart Weston, Tim Natusch Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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