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OH masers in the Milky Way and Local Group galaxies in the SKA era


Etoka, S and Engels, D and Imai, H and Dawson, J and Ellingsen, S and Sjouwerman, L and van Langevelde, H, OH masers in the Milky Way and Local Group galaxies in the SKA era, Advancing Astrophysics with the Square Kilometre Array, 09-13 June 2014, Giardini Naxos, Italy, pp. 139-152. ISBN 978-1-909204-70-6 (2015) [Refereed Conference Paper]


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

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The intense line emission of OH masers is a perfect tracer of regions where new stars are born as well as of evolved stars, shedding large amounts of processed matter into the interstellar medium. From SKA deep surveys at 18 cm, where the maser lines from the ground-state of the OH molecule arise, we predict the discovery of more than 20000 sources of stellar and interstellar origin throughout the Galaxy. The study of this maser emission has many applications, including the determination of magnetic field strengths from polarisation measurements, studies of stellar kinematics using the precisely determined radial velocities, and distance determinations from VLBI astrometry. A new opportunity to study shocked gas in different galactic environments is expected to arise with the detection of lower luminosity masers. For the first time, larger numbers of OH masers will be detected in Local Group galaxies. New insights are expected in structure formation in galaxies by comparing maser populations in galaxies of different metallicity, as both their properties as well as their numbers depend on it. With the full capabilities of SKA, further maser transitions such as from excited OH and from methanol will be accessible, providing new tools to study the evolution of star-forming regions in particular.

Item Details

Item Type:Refereed Conference Paper
Keywords:star formation, masers
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, S (Professor Simon Ellingsen)
ID Code:102555
Year Published:2015
Deposited By:Mathematics and Physics
Deposited On:2015-08-28
Last Modified:2017-11-03
Downloads:311 View Download Statistics

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