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14 years of 6.7 GHz periodic methanol maser observations towards G188.95+0.89

Published online by Cambridge University Press:  29 January 2021

Martin M. Mutie ,
Paul Baki ,
James O. Chibueze  and
Khadija El Bouchefry
Martin M. Mutie
Affiliation:
Department of Physics, Technical University of Kenya, P. O. Box 52428-00200, Nairobi, Kenya Department of Physical Sciences, Chuka University, P. O. Box 109-60400, Chuka, Kenya
Paul Baki
Affiliation:
Department of Physics, Technical University of Kenya, P. O. Box 52428-00200, Nairobi, Kenya
James O. Chibueze
Affiliation:
Centre for Space Research, Physics Department, North-West University, Potchefstroom2520, South Africa Department of Physics and Astronomy, University of Nigeria, Carver Building, 1 University Road, Nsukka, Nigeria
Khadija El Bouchefry
Affiliation:
South African Radio Astronomy Observatory, Rosebank, Johannesburg, South Africa emails: martmulesh@gmail.com; paulbaki@gmail.com; james.chibueze@gmail.com and kelbouchefry@ska.ac.za
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Abstract

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We report the results of 14 years of monitoring of G188.95+0.89 periodic 6.7 GHz methanol masers using the Hartebeesthoek 26-m radio telescope. G188.95+0.89 (S252, AFGL5180) is a radio-quiet methanol maser site that is often interpreted as precursors of ultra-compact HII regions or massive protostar sites. At least five bright spectral components were identified. The maser feature at 11.36 km s-1 was found to experience an exponential decay during the monitoring period. The millimetre continuum reveals two cores associated with the source.

Keywords

ISM: individual (G188.95+0.89)ISM: moleculesstars: imaging
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 393 - 394
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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