New periodic 6.7 GHz class II methanol maser associated with G358.460-0.391

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Authors

Maswanganye, J.P.
Gaylard, M.J.
Goedhart, S.
Van der Walt, D.J.
Booth, Roy S.

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Publisher

Oxford University Press

Abstract

Eight new class II methanol masers selected from the 6.7 GHz Methanol Multibeam survey catalogues I and II were monitored at 6.7 GHz with the 26m Hartebeesthoek Radio Astronomy Observatory (HartRAO) radio telescope for three years and seven months, from February 2011 to September 2014. The sources were also observed at 12.2 GHz and two were sufficiently bright to permit monitoring. One of the eight sources, namely G358.460-0.391, was found to show periodic variations at 6.7 GHz. The period was determined and tested for significance using the Lomb-Scargle, epoch-folding and Jurkevich methods, and by fitting a simple analytic function. The best estimate for the period of the 6.7 GHz class II methanol maser line associated with G358.460-0.391 is 220.0 ± 0.2 day.

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Keywords

Masers HII regions ISM, Clouds Radio lines, ISM stars, Formation

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Citation

Maswanganye, JP, Gaylard, MJ, Goehart, S, Van der Walt, DJ & Booth, RS 2014, 'New periodic 6.7 GHz class II methanol maser associated with G358.460-0.391', Monthly Notices of the Royal Astronomical Society, vol. 446, no. 3, pp. 2730-2737.