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AGN astrometry: A powerful tool for galaxy kinematic studies

Published online by Cambridge University Press:  29 January 2021

Naftali Kimani ,
Andreas Brunthaler  and
Karl M. Menten
Naftali Kimani
Affiliation:
Kenyatta University, P.O. Box 43844, 00100 Nairobi, Kenya email: kimani.naftali@ku.ac.ke
Andreas Brunthaler
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
Karl M. Menten
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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Abstract

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This article highlights the successes of the high resolution astrometric VLBI observations used for measuring proper motion of galaxies in the Local group. The required, high accuracies, often in the μ as yr−1 regime, are only attainable through the use of the phase-referencing technique. These require either a compact radio source (AGN) or strong maser emission in the target galaxy and, additionally, some compact extra-galactic radio sources (quasars) to serve as ideal background reference source. The derived proper motions can lead to lower limits on the orbital lower estimates to the mass of the host galaxy, promise a new handle on dynamical models of interacting galaxy systems and offer insights on the spatial distribution of dark matter in the near universe.

Keywords

AGNVLBIproper motionGalaxy evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 276 - 279
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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