TY - JOUR

T1 - Extragalactic Radio Sources with Large Changes in Their Apparent Coordinates

AU - Osetrova, A.A.

AU - Titov, O.A.

AU - Melnikov, A.E.

N1 - Export Date: 01 November 2025; Cited By: 2; Correspondence Address: A.A. Osetrova; St. Petersburg State University, St. Petersburg, 199034, Russian Federation; email: gelaosetrova@gmail.com

PY - 2024

Y1 - 2024

N2 - Abstract: We have analyzed the time series of coordinates for 5468 radio sources obtained from geodetic VLBI observations in 1993–2024. We have identified 49 objects whose coordinates change within the range from 6 to 143 mas. We have revealed several types of astrometric instability probably associated with different astrophysical processes in active galactic nuclei. In some cases, the coordinates change rapidly over a relatively short time interval (1–3 years). These peculiarities should be taken into account while compiling the next fundamental astrometric ICRF catalogue. © 2025 Elsevier B.V., All rights reserved.

AB - Abstract: We have analyzed the time series of coordinates for 5468 radio sources obtained from geodetic VLBI observations in 1993–2024. We have identified 49 objects whose coordinates change within the range from 6 to 143 mas. We have revealed several types of astrometric instability probably associated with different astrophysical processes in active galactic nuclei. In some cases, the coordinates change rapidly over a relatively short time interval (1–3 years). These peculiarities should be taken into account while compiling the next fundamental astrometric ICRF catalogue. © 2025 Elsevier B.V., All rights reserved.

KW - active galactic nuclei

KW - extragalactic radio sources

KW - ICRF

KW - IVS

KW - proper motions

KW - VLBI

U2 - 10.1134/S1063773725700045

DO - 10.1134/S1063773725700045

M3 - статья

VL - 50

SP - 657

EP - 670

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 11

ER -