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dc.contributor.authorTowner, A. P. M.
dc.contributor.authorBrogan, C. L.
dc.contributor.authorHunter, T. R.
dc.contributor.authorCyganowski, C. J.
dc.contributor.authorMcGuire, B. A.
dc.contributor.authorIndebetouw, R.
dc.contributor.authorFriesen, R. K.
dc.contributor.authorChandler, C. J.
dc.date.accessioned2017-07-12T12:30:20Z
dc.date.available2017-07-12T12:30:20Z
dc.date.issued2017-06-16
dc.identifier.citationTowner , A P M , Brogan , C L , Hunter , T R , Cyganowski , C J , McGuire , B A , Indebetouw , R , Friesen , R K & Chandler , C J 2017 , ' VLA Survey of dense gas in extended green objects : prevalence of 25 GHz methanol masers ' , Astrophysical Journal Supplement Series , vol. 230 , no. 2 , 22 . https://doi.org/10.3847/1538-4365/aa73d8en
dc.identifier.issn0067-0049
dc.identifier.otherPURE: 250497307
dc.identifier.otherPURE UUID: 04d6f50c-55e2-4cc8-8a29-c530d58f944f
dc.identifier.otherScopus: 85021341382
dc.identifier.otherWOS: 000404107900002
dc.identifier.urihttps://hdl.handle.net/10023/11191
dc.descriptionC.J. Cyganowski acknowledges support from the STFC (grant number ST/M001296/1).en
dc.description.abstractWe present ∼1″-4″ resolution Very Large Array (VLA) observations of four CH3OH-E 25 GHz transitions (J = 3, 5, 8, 10) along with the 1.3 cm continuum toward 20 regions of active massive star formation containing Extended Green Objects (EGOs), 14 of which we have previously studied with the VLA in the Class I 44 GHz and Class II 6.7 GHz maser lines. Sixteen regions are detected in at least one 25 GHz line (J = 5), with 13 of 16 exhibiting maser emission. In total, we report 34 new sites of CH3OH maser emission and 10 new sites of thermal CH3OH emission, significantly increasing the number of 25 GHz Class I CH3OH masers observed at high angular resolution. We identify probable or likely maser counterparts at 44 GHz for all 15 of the 25 GHz masers for which we have complementary data, providing further evidence that these masers trace similar physical conditions despite uncorrelated flux densities. The sites of thermal and maser emission of CH3OH are both predominantly associated with the 4.5 μm emission from the EGO, and the presence of thermal CH3OH emission is accompanied by 1.3 cm continuum emission in 9 out of 10 cases. Of the 19 regions that exhibit 1.3 cm continuum emission, it is associated with the EGO in 16 cases (out of a total of 20 sites), 13 of which are new detections at 1.3 cm. Twelve of the 1.3 cm continuum sources are associated with 6.7 GHz maser emission and likely trace deeply embedded massive protostars.
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Supplement Seriesen
dc.rights© 2017 The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://doi.org/10.3847/1538-4365/aa73d8en
dc.subjectISM: jets and outflowsen
dc.subjectMasersen
dc.subjectStars: formationen
dc.subjectStars: massiveen
dc.subjectTechniques: interferometricen
dc.subjectAstronomy and Astrophysicsen
dc.subjectSpace and Planetary Scienceen
dc.subjectNDASen
dc.titleVLA Survey of dense gas in extended green objects : prevalence of 25 GHz methanol masersen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doihttps://doi.org/10.3847/1538-4365/aa73d8
dc.description.statusPeer revieweden
dc.identifier.grantnumberST/M001296/1en


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