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On the methanol masers in G9.62+0.20E and G188.95+0.89

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dc.contributor.author Van der Walt, Diederick Johannes
dc.date.accessioned 2012-09-03T11:21:53Z
dc.date.available 2012-09-03T11:21:53Z
dc.date.issued 2011
dc.identifier.citation Van der Walt, D.J. 2011. On the methanol masers in G9.62+0.20E and g188.95+0.89. The Astronomical journal, 141(152):1-6. [http://iopscience.iop.org/1538-3881] en_US
dc.identifier.issn 0004-6256
dc.identifier.issn 1538-3881 (Online)
dc.identifier.uri http://hdl.handle.net/10394/7209
dc.description.abstract A comparison between the observed light curves of periodic masers in G9.62+0.20E and G188.95+0.89 and the results of a simple colliding-wind binary model is made to establish whether the flaring and other time-dependent behavior of the masers in these two star-forming regions can be ascribed to changes in the environment of the masers or in the continuum emission from parts of the background Hii region. It is found that the light curves of widely different shape and amplitude in these two objects can be explained within the framework of a periodic pulse of ionizing radiation that raises the electron density in a volume of partially ionized gas against which the masers are projected. It is also shown that the decay of the 11.405 km s−1 maser in G188.95+0.89 can be explained very well in terms of the recombination of the ionized gas against which the maser is projected, while it would require very special conditions to explain it in terms of changes in the environment of the maser. We conclude that for G9.62+0.20E and G188.95+0.89 the observed changes in the masers are most likely due to changes in the background free-free emission which is amplified by the masers. en_US
dc.description.uri http://iopscience.iop.org/1538-3881/141/5/152/pdf/1538-3881_141_5_152.pdf
dc.description.uri http://dx.doi.org/10.1088/0004-6256/141/5/152
dc.language.iso en en_US
dc.publisher IOP publishers en_US
dc.subject ISM individual objects (G9.62+0.20E, G188.95+0.89) en_US
dc.subject ISM: molicules en_US
dc.subject masers en_US
dc.subject radio lines en_US
dc.title On the methanol masers in G9.62+0.20E and G188.95+0.89 en_US
dc.type Article en_US


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