Ammonia Masers in W51: Interferometric Studies

Thomas L. Wilson T. E. Clarke D. A. Boboltz 1 C. Henkel 2 R. Mauersberger H. A. Wootten N. Brouillet 3 Alain Baudry 3 D. Despois 3
3 FORMATION STELLAIRE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : 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.
Type de document :
Communication dans un congrès
American Astronomical Society, AAS Meeting #223, #331.03 - 5-9 January 2014 in Washington, DC, 2014, Washington, DC, United States
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https://hal.archives-ouvertes.fr/hal-00944129
Contributeur : Marie-Paule Pomies <>
Soumis le : lundi 10 février 2014 - 10:55:03
Dernière modification le : lundi 13 octobre 2014 - 15:43:25

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Thomas L. Wilson, T. E. Clarke, D. A. Boboltz, C. Henkel, R. Mauersberger, et al.. Ammonia Masers in W51: Interferometric Studies. American Astronomical Society, AAS Meeting #223, #331.03 - 5-9 January 2014 in Washington, DC, 2014, Washington, DC, United States. 〈hal-00944129〉

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