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dc.contributor.authorVan den Heever, S.P.
dc.contributor.authorVan der Walt, D.J.
dc.contributor.authorPittard, J.M.
dc.contributor.authorHoare, M.G.
dc.date.accessioned2019-07-22T12:49:51Z
dc.date.available2019-07-22T12:49:51Z
dc.date.issued2019
dc.identifier.citationVan den Heever, S.P. et al. 2019. Periodic methanol masers: from a colliding wind binary (CWB) perspective. Monthly notices of the Royal Astronomical Society, 485(2):2759-2771. [https://doi.org/10.1093/mnras/stz576]en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/32947
dc.identifier.urihttps://academic.oup.com/mnras/article-pdf/485/2/2759/28066924/stz576.pdf
dc.identifier.urihttps://doi.org/10.1093/mnras/stz576
dc.description.abstractSince the discovery of periodic class II methanol masers at 6.7 and 12.2 GHz associated with high-mass star formation regions (HMSFRs), a number of possible driving mechanisms have been proposed to explain this phenomenon. Here, we apply a more realistic treatment of the original colliding wind binary (CWB) model explanation to investigate to what extent it can describe the flare profiles of the periodic methanol masers. It was found that the CWB hypothesis is feasible from an energetics standpoint, because the emission from the shocked gas does cause an outward shift of the position of the ionization front (IF). This confirms that the energy budget available from the shocked gas is enough to be the driving force behind the CWB model. The CWB model describes the light curve of the 1.25 km s−1 12.2 GHz velocity feature of G9.62 + 0.20E very well over 4000 d. The quiescent state flux density of the 1.25 km s−1 velocity feature can also be described very well by the time-dependent change in electron density (ne). The CWB model also describes the other periodic methanol masers, G22.357 + 0.066, G37.55 + 0.20, and G45.473 + 0.134, which have similar light curves, very well. This strongly suggests that these periodic methanol masers can be described by the time-dependent change in the free–free emission from some part of the background H II region against which the masers are projecteden_US
dc.language.isoenen_US
dc.publisherOxford Univ Pressen_US
dc.subjectHydrodynamicsen_US
dc.subjectMasersen_US
dc.subjectH II regionsen_US
dc.subjectISM: moleculesen_US
dc.subjectRadio lines: ISMen_US
dc.subjectXrays: binariesen_US
dc.titlePeriodic methanol masers: from a colliding wind binary (CWB) perspectiveen_US
dc.typeArticleen_US
dc.contributor.researchID10060499 - Van der Walt, Diederick Johannes
dc.contributor.researchID13077724 - Van den Heever, Stefanus Petrus


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