Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3
Abstract
We compare ICRF3 S/X, K, and X/Ka positions with Gaia EDR3 for 512 common sources. After aligning the reference frames, we examine radio–optical offsets and their relationships with observing frequency and source properties. The offsets correlate statistically with radio structure. The S/X frame remains the preferred choice for alignment with the Gaia celestial reference frame.
Type
Publication
Astronomy & Astrophysics 652, A87 (2021)
Niu Liu
Assistant Professor
My research focuses on astronomical reference systems, VLBI astrometry, space astrometry, and pulsar astrometry.
Zi Zhu
Professor
My research focuses on astrometric methods, astronomical reference systems, and Galactic astronomy.
Jia-Cheng Liu
Professor
My research interests include theoretical mechanics, space astrometry, and astronomical reference systems.
Nan Jiang
Master’s Graduate (2022)
