Milliarcsecond structure of water maser emission in two young high-mass stellar objects associated with methanol masers

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dc.contributor.author Bartkiewicz, Anna
dc.contributor.author Szymczak, Marian
dc.contributor.author van Langevelde, Huib Jan
dc.date.accessioned 2017-05-07T10:59:21Z
dc.date.available 2017-05-07T10:59:21Z
dc.date.issued 2012
dc.identifier.citation Astronomy and Astrophysics
dc.identifier.other 10.1051/0004-6361/201218999
dc.identifier.uri http://repozytorium.umk.pl/handle/item/4324
dc.description.abstract Context. The 22.2 GHz water masers are often associated with the 6.7 GHz methanol masers but owing to the different excitation conditions they likely probe independent spatial and kinematic regions around the powering young massive star. Aims. We compared the emission of these two maser species on milliarcsecond scales to determine in which structures the masers arise and to test a disc-outflow scenario where the methanol emission arises in a circumstellar disc while the water emission comes from an outflow. Methods. We obtained high-angular and spectral resolution 22.2 GHz water maser observations of the two sources G31.581+00.077 and G33.641−00.228 using the EVN. Results. In both objects the water maser spots form complex and filamentary structures of sizes 18–160 AU. The emission towards the source G31.581+00.077 comes from two distinct regions of which one is related to the methanol maser source of ring-like shape. In both targets the main axis of methanol distribution is orthogonal to the water maser distribution. Most of water masers appear to trace shocks on a working surface between an outflow/jet and a dense envelope. Some spots are possibly related to the disc-wind interface which is as close as 100–150 AU to the regions of methanol emission.
dc.description.sponsorship The Polish Ministry of Science and Higher Education through grant N N203 386937
dc.language.iso eng
dc.publisher EDP Sciences
dc.relation.ispartofseries 541;A72
dc.rights Attribution-NoDerivs 3.0 Poland
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri http://creativecommons.org/licenses/by-nd/3.0/pl/
dc.subject stars: formation
dc.subject ISM: molecules
dc.subject masers
dc.subject instrumentation: high angular resolution
dc.title Milliarcsecond structure of water maser emission in two young high-mass stellar objects associated with methanol masers
dc.type info:eu-repo/semantics/article

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