European VLBI Network observations of 6.7 GHz methanol masers in clusters of massive young stellar objects

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dc.contributor.author Bartkiewicz, Anna
dc.contributor.author Szymczak, Marian
dc.contributor.author van Langevelde, Huib Jan
dc.date.accessioned 2017-05-07T10:59:39Z
dc.date.available 2017-05-07T10:59:39Z
dc.date.issued 2014
dc.identifier.citation Astronomy and Astrophysics
dc.identifier.other 10.1051/0004-6361/201322629
dc.identifier.uri http://repozytorium.umk.pl/handle/item/4325
dc.description.abstract Context. Methanol masers at 6.7 GHz are associated with high-mass star-forming regions (HMSFRs) and often have mid-infrared (MIR) counterparts characterized by extended emission at 4.5 μm, which likely traces outflows from massive young stellar objects (MYSOs). Aims. Our objectives are to determine the milliarcsecond (mas) morphology of the maser emission and to examine if it comes from one or several candidate MIR counterparts in the clusters of MYSOs. Methods. The European VLBI Network (EVN) was used to image the 6.7 GHz maser line with ∼2.1' field of view toward 14 maser sites from the Torun catalog. Quasi-simultaneous observations were carried out with the Torun 32 m telescope. Results. We obtained maps with mas angular resolution that showed diversity of methanol emission morphology: a linear distribution (e.g., G37.753−00.189), a ring-like (G40.425+00.700), and a complex one (e.g., G45.467+00.053). The maser emission is usually associated with the strongest MIR counterpart in the clusters; no maser emission was detected from other MIR sources in the fields of view of 2.1' in diameter. The maser source luminosity seems to correlate with the total luminosity of the central MYSO. Although the Very Long Baseline Interferometry (VLBI) technique resolves a significant part of the maser emission, the morphology is still well determined. This indicates that the majority of maser components have compact cores.
dc.description.sponsorship The National Science Centre Poland (NCN) grant no. 2011/03/B/ST9/00627
dc.language.iso eng
dc.publisher EDP Sciences
dc.relation.ispartofseries 564;A110
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 European VLBI Network observations of 6.7 GHz methanol masers in clusters of massive young stellar objects
dc.type info:eu-repo/semantics/article

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