Ammonia Masers in W51: Interferometric Studies
| dc.contributor.author | WILSON, Thomas L. | |
| dc.contributor.author | CLARKE, T. E. | |
| hal.structure.identifier | U.S. Naval Observatory | |
| dc.contributor.author | BOBOLTZ, D. A. | |
| hal.structure.identifier | Institut für Physik [Potsdam] | |
| dc.contributor.author | HENKEL, C. | |
| dc.contributor.author | MAUERSBERGER, R. | |
| dc.contributor.author | WOOTTEN, H. A. | |
| hal.structure.identifier | FORMATION STELLAIRE 2014 | |
| dc.contributor.author | BROUILLET, N. | |
| hal.structure.identifier | FORMATION STELLAIRE 2014 | |
| dc.contributor.author | BAUDRY, Alain | |
| hal.structure.identifier | FORMATION STELLAIRE 2014 | |
| dc.contributor.author | DESPOIS, D. | |
| dc.date.conference | 2014 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.title.en | Ammonia Masers in W51: Interferometric Studies | |
| dc.type | Communication dans un congrès | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR] | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR] | |
| bordeaux.conference.title | American Astronomical Society, AAS Meeting #223, #331.03 - 5-9 January 2014 in Washington, DC | |
| bordeaux.country | US | |
| bordeaux.conference.city | Washington, DC | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00944129 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.proceedings | non | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00944129v1 | |
| bordeaux.COinS | ctx_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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