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Maser Astrometry: from Galactic Structure to Local Group Cosmology

Published online by Cambridge University Press:  24 July 2012

Mark J. Reid
Mark J. Reid*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
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Abstract

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This review summarizes current advances in astrometry of masers as they pertain to large-scale Galactic structure and dynamics and Local Group cosmology. Parallaxes and proper motions have now been measured for more than 60 massive star forming regions using the Japanese VERA array, the EVN and the VLBA. These results provide “gold standard” distances and 3-dimensional velocities for sources across the Milky Way, revealing its spiral structure. Modeling these data tightly constrains the fundamental parameters of the Milky Way: R0 and Θ0. Proper motions of Local Group galaxies have been measured, improving our understanding of the history and fate of the Group.

Keywords

astrometrymasersstars: formationGalaxy: fundamental parametersGalaxy: structureGalaxy: kinematics and dynamicsgalaxies: kinematics and dynamicsLocal Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 359 - 367
Copyright
Copyright © International Astronomical Union 2012

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