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Ammonia Masers in W51: Interferometric Studies

dc.contributor.authorWILSON, Thomas L.
dc.contributor.authorCLARKE, T. E.
hal.structure.identifierU.S. Naval Observatory
dc.contributor.authorBOBOLTZ, D. A.
hal.structure.identifierInstitut für Physik [Potsdam]
dc.contributor.authorHENKEL, C.
dc.contributor.authorMAUERSBERGER, R.
dc.contributor.authorWOOTTEN, H. A.
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorBROUILLET, N.
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorBAUDRY, Alain
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorDESPOIS, D.
dc.date.conference2014
dc.description.abstractEnThe galactic continuum sources W51D and W51e1e2 have been long recognized as remarkable centers of ammonia maser phenomena in the centimeter wavelength range. Henkel et al. (2013 A&A 549, A90) have measured 19 masers, of which 13 are newly found for W51-IRS2, otherwise known as W51D. These arise from inversion-rotation transitions. The single dish data were taken with the Effelsberg 100-m radio telescope of the MPIfR with an angular resolution of 43 arc seconds. The conclusion that these lines were caused by maser action is based on: (1) time variability, and (2) narrow linewidths. In addition, some lines showed systematic velocity variations. High brightness temperatures and compact sizes are needed to conclusively prove maser action. We have measured a sub-set of these ammonia lines with the C array of the Jansky-Very Large Array of the National Radio Astronomy Observatory in June 2013 with an angular resolution of better than 1 arc second. Source sizes, positions, excitation models and reasons why W51 shows such a plethora of masers will be presented.
dc.language.isoen
dc.title.enAmmonia Masers in W51: Interferometric Studies
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
bordeaux.conference.titleAmerican Astronomical Society, AAS Meeting #223, #331.03 - 5-9 January 2014 in Washington, DC
bordeaux.countryUS
bordeaux.conference.cityWashington, DC
bordeaux.peerReviewedoui
hal.identifierhal-00944129
hal.version1
hal.invitednon
hal.proceedingsnon
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00944129v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=WILSON,%20Thomas%20L.&CLARKE,%20T.%20E.&BOBOLTZ,%20D.%20A.&HENKEL,%20C.&MAUERSBERGER,%20R.&rft.genre=unknown


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