University Of Tasmania
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Maser astrometry with VLBI and the SKA

conference contribution
posted on 2023-05-23, 10:18 authored by Green, JA, Jan van Langevelde, H, Brunthaler, A, Simon EllingsenSimon Ellingsen, Imai, H, Vlemmings, W, Reid, M, Richards, A
We discuss the unique opportunities for maser astrometry with the inclusion of the Square Kilometre Array (SKA) in Very Long Baseline Interferometry (VLBI) networks. The first phase of the SKA will enable observations of hydroxyl and methanol masers, positioning the latter to an accuracy of 5 microarcseconds, and the second phase may allow water maser observations. These observations will provide trigonometric distances with errors as small as 1%. The unrivalled sensitivity of the SKA will enable large-scale surveys and, through joint operations, will turn any VLBI network into a fast astrometry device. Both evolved stars and high mass star formation regions will be accessible throughout the (Southern) Milky Way, completing our understanding of the content, dynamics and history of our Galaxy. Maser velocities and proper motions will be measurable in the Local Group of galaxies and beyond, providing new insights into their kinematics and evolution.


Publication title

Advancing Astrophysics with the Square Kilometre Array


TL Bourke, R Braun, R Fender et al






School of Natural Sciences


Dolman Scott Ltd

Place of publication

United Kingdom

Event title

Advancing Astrophysics with the Square Kilometre Array

Event Venue

Giardini Naxos, Italy

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright 2015 the Author Licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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