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Submillimeter Array observations of 321 GHz water maser emission in Cepheus A

Published online by Cambridge University Press:  01 March 2007

Nimesh A. Patel ,
Salvador Curiel ,
Qizhou Zhang ,
T. K. Sridharan ,
Paul T. P. Ho  and
José M. Torrelles
Nimesh A. Patel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA email: npatel@cfa.harvard.edu
Salvador Curiel
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM), Mexico
Qizhou Zhang
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA email: npatel@cfa.harvard.edu
T. K. Sridharan
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA email: npatel@cfa.harvard.edu
Paul T. P. Ho
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA email: npatel@cfa.harvard.edu Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan
José M. Torrelles
Affiliation:
Instituto de Ciencias del Espacio (CSIC)-IEEC, Facultat de Física, Universitat de Barcelona, Barcelona, Spain
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Abstract

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Using the Submillimeter Array (SMA) we have imaged for the first time the 321.226 GHz, 1029 − 936 ortho-H2O maser emission. This is also the first detection of this line in the Cepheus A high-mass star-forming region. The 22.235 GHz, 616 – 523 water masers were also observed with the Very Large Array 43 days following the SMA observations. Three of the nine detected submillimeter maser spots are associated with the centimeter masers spatially as well as kinematically, while there are 36 22 GHz maser spots without corresponding submillimeter masers. In the HW2 source, both the 321 GHz and 22 GHz masers occur within the region of ~1″ which includes the disk-jet system, but the position angles of the roughly linear structures traced by the masers indicate that the 321 GHz masers are along the jet while the 22 GHz masers are perpendicular to it. We interpret the submillimeter masers in Cepheus A to be tracing significantly hotter regions (600~2000 K) than the centimeter masers.

Keywords

ISM: jets and outflowssubmillimetermasersstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 489 - 493
Copyright
Copyright © International Astronomical Union 2008

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