Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric variability (unexplained variance) for each source a...

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Bibliographic Details

Published in:	The Astrophysical Journal Supplement Series
Main Authors:	Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert
Format:	Article
Language:	English
Published:	IOP Publishing 2024-01-01
Subjects:	Very long baseline interferometry Astrometry Quasars Radio sources
Online Access:	https://doi.org/10.3847/1538-4365/ad6772