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Periodic masers in massive star forming regions

Published online by Cambridge University Press:  16 July 2018

S. Goedhart ,
R. van Rooyen ,
D. J. van der Walt ,
J. P. Maswanaganye ,
G. C. MacCleod  and
A. Sanna
S. Goedhart
Affiliation:
SKA SA, The Park, Park Rd, Pinelands, Cape Town, 7405, South Africa email: sharmila@ska.ac.za
R. van Rooyen
Affiliation:
SKA SA, The Park, Park Rd, Pinelands, Cape Town, 7405, South Africa email: sharmila@ska.ac.za
D. J. van der Walt
Affiliation:
Space Research Unit, Physics Department, North-West University, Potchefstroom, South Africa
J. P. Maswanaganye
Affiliation:
Space Research Unit, Physics Department, North-West University, Potchefstroom, South Africa
G. C. MacCleod
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp, 1740, South Africa
A. Sanna
Affiliation:
Max-Planck-Institut für Radioastonomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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Abstract

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The first periodic Class II methanol maser was reported on in 2003. Since that time, a number of different monitoring programmes have found periodic masers, as well as other modes of variability. In a few cases, periodicity has been found in other maser species such as formaldehyde and water. Several distinct characteristics of light curves have been noted, possibly pointing to different underlying mechanisms for periodicity if one assumes a linear response to incoming radiation. I will give a brief overview of the known periodic sources, discuss current theories, and present new results obtained from monitoring mainline hydroxyl masers using the seven-element Karoo Array Telescope (KAT-7) during its science verification phase.

Keywords

masersstars: formationISM: moleculesradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 225 - 230
Copyright
Copyright © International Astronomical Union 2018 

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