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Water Masers Outburst in the Massive Stellar Cluster W49A

Published online by Cambridge University Press:  31 March 2017

Busaba H. Kramer ,
Karl M. Menten ,
Tomasz Kamiński ,
Bo Zhang ,
Nimesh A. Patel  and
Alex Kraus
Busaba H. Kramer
Affiliation:
Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: [email protected] National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
Karl M. Menten
Affiliation:
Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: [email protected]
Tomasz Kamiński
Affiliation:
European Southern Observatory, Alonso de Cordova 3107 Vitacura, Santiago, Chile
Bo Zhang
Affiliation:
Shanghai Astronomical Observatory, Shanghai 200030, P. R. China
Nimesh A. Patel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
Alex Kraus
Affiliation:
Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: [email protected]
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Abstract

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We report a multi-wavelength study of a recent major flare (~ 80,000 Jy at VLSR ~ -98.1 km s−1) of the 22-GHz water maser in W49A. In February 2014, we started monthly monitoring with the Effelsberg 100-m radio telescope. In May 2014, we carried out the nearly simultaneous observations of the 22-GHz transition with selected submillimeter water transitions using the IRAM 30-m telescope (at 183 GHz) and the Atacama Pathfinder Experiment (APEX) 12-m telescope (from 321 to 475 GHz). We have also performed interferometric observations using the NRAO Very Long Baseline Array (VLBA) at 22 GHz and the Submillimeter Array (SMA) at 321 and 325 GHz. One remarkable result is the detection of very high velocity emission features in several transitions. Our data also represent its first detection of the 475-GHz water transition in a star-forming region. Studying these multiple masing transitions in conjunction with theoretical modeling of their excitation not only places strong constraints on the physical conditions of the masing gas but also allows us to study their association with the embedded massive stellar cluster in W49A.

Keywords

masersstars: formationISM: moleculesradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 155 - 156
Copyright
Copyright © International Astronomical Union 2017 

References

Honma, M., Choi, Y. K. & Bushimata, T., et al. 2004, PASJ, 56, L15 Google Scholar
Kramer, B. H., Menten, K. M., Kamiński, T., et al. in prep.Google Scholar