Hostname: page-component-848d4c4894-v5vhk Total loading time: 0 Render date: 2024-06-15T11:02:39.604Z Has data issue: false hasContentIssue false

Structure of the Milky Way: View from the Southern Hemisphere

Published online by Cambridge University Press:  16 July 2018

Lucas J. Hyland
Affiliation:
School of Physical Sciences, University of Tasmania 7005 Tasmania, Australia email: Lucas.Hyland@utas.edu.au, Simon.Ellingsen@utas.edu.au
Simon P. Ellingsen
Affiliation:
School of Physical Sciences, University of Tasmania 7005 Tasmania, Australia email: Lucas.Hyland@utas.edu.au, Simon.Ellingsen@utas.edu.au
Mark J. Reid
Affiliation:
Harvard–Smithsonian Centre for Astrophysics, CambridgeMA 02138, USA email: mreid@cfa.harvard.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The exclusive association of Class II methanol masers with high mass star formation regions and in turn spiral arms, makes them ideal tracers of spiral structure. The bright and compact nature of masers also makes them good sources for Very Long Baseline Interferometry, with their fluxes visible on some of the longest terrestrial baselines. The success of the BeSSeL (Bar and Spiral Structure Legacy) project has demonstrated the use of masers in large scale high–precision trigonometric parallax surveys. This survey was then able to precisely map the spiral arms visible from the Northern Hemisphere and recalculate the fundamental Milky Way parameters R0 and θ0. The majority of the Milky Way is visible from the Southern Hemisphere and at the present time the Australian LBA (Long Baseline Array) is the only Southern Hemisphere array capable of taking high–precision trigonometric parallax data. We present the progress–to–date of the Southern Hemisphere experiment. We will also unveil a new broadband Southern Hemisphere array, capable of much faster parallax turnaround and atmospheric calibration.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

Krishnan, V., Ellingsen, S. P., Reid, M. J., et al. 2017, MRNAS, 465, 1095CrossRefGoogle Scholar
Krishnan, V., Ellingsen, S. P., Reid, M. J., et al. 2015, ApJ, 805, 129Google Scholar
Lovell, J. E. J., McCallum, J. N., Reid, P. B., et al. 2013, Journal of Geodesy, 87, 527CrossRefGoogle Scholar
Reid, M. J., Menten, K. M., Brunthaler, A., & Moellenbrock, G. A. 2009, in Astronomy, Vol. 2010, astro2010: The Astronomy and Astrophysics Decadal SurveyGoogle Scholar
Reid, M. J., Menten, K. M., Zheng, X. W., et al. 2009b, ApJ, 700, 137Google Scholar
Reid, M. J., Menten, K. M., Brunthaler, A., et al. 2014, ApJ, 783, 130CrossRefGoogle Scholar
Reid, M. J., Dame, T. M., Menten, K. M., & Brunthaler, A., 2016, ApJ, 823, 77CrossRefGoogle Scholar
Rioja, M. J., Stevens, E., Gurvits, L., et al. 1997, Vistas in Astronomy, 41, 213Google Scholar
Rioja, M. J., Dodson, R., Orosz, G., Imai, H., & Frey, S., 2017, AJ, 153, 105Google Scholar
Sun, J., Böhm, J., Nilsson, T., et al. 2014, Journal of Geodesy, 88, 449CrossRefGoogle Scholar