Southern Hemisphere Maser Astrometry

Simon Ellingsen, Mark Reid, Karl Menten, Lucas Hyland, Jayender Kumar, Gabor Oroz, Stuart Weston, Richard Dodson, Maria Rioja

Research output: Contribution to journalConference articlepeer-review


Many astrophysical phenomena can only be studied in detail for objects in our galaxy, the Milly Way, but we know much more about the structure of thousands of nearby galaxies than we do about our own Galaxy. Accurate distance measurements in the Milky Way underpin our ability to understand a wide range of astrophysical phenomena and this requires observations from both the northern and southern hemisphere. Our ability to measure accurate parallaxes to southern masers has been hampered a range of factors, in particular the absence of a dedicated, homogeneous VLBI array in the south. We have recently made significant advances in astrometric calibration techniques which allow us to achieve trigonometric parallax accuracies of around 10 micro-arcseconds (as) for 6.7 GHz methanol masers with a hetrogeneous array of 4 antennas. We outline the details of this new multiview technique and present the first trigonometric parallax measurements that utilise this approach.
Original languageEnglish
Pages (from-to)457-460
Number of pages4
JournalProceedings of the International Astronomical Union
Publication statusPublished - 7 Dec 2022


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