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SMA imaging of the masers in MWC349A

Published online by Cambridge University Press:  01 March 2007

Jonathan Weintroub ,
James Moran ,
Ramprasad Rao ,
Hiroko Shinnaga ,
David Wilner  and
Ken Young
Jonathan Weintroub*
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS78, Cambridge, MA 02138, USA email: jweintroub@cfa.harvard.edu
James Moran
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS78, Cambridge, MA 02138, USA email: jweintroub@cfa.harvard.edu
Ramprasad Rao
Affiliation:
ASIAA, 645 North A'ohoku Place, Hilo, Hawaii 96720
Hiroko Shinnaga
Affiliation:
Caltech Submillimeter Observatory, 111 Nowelo Street, Hilo, HI 96720
David Wilner
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS78, Cambridge, MA 02138, USA email: jweintroub@cfa.harvard.edu
Ken Young
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS78, Cambridge, MA 02138, USA email: jweintroub@cfa.harvard.edu
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Abstract

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In September 2004 and September 2005 we used the Submillimeter Array (SMA) to map the distribution of hydrogen recombination line (HRL) maser spots that originate in the envelope of the peculiar star MWC349A. We measured positions in the line over a 100 km/s velocity range with 1 km/s spectral resolution. Relative angular position was estimated to an accuracy of about 0.01 arcseconds. The H30α maser components can be tracked continuously in frequency between the red- and blue-shifted peaks of the spectrum. The masers appear to trace a nearly edge-on disk-like structure. The position-velocity relationship is quite remarkable, and reminiscent of that of NCG4258. However, the “wings” in the PV relation are too steep for a simple Keplerian prescription to be correct. We present our data, and suggest a simple model to account for the steep wings.

Keywords

masersinstrumentation: high angular resolutionsubmillimeterradio lines: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 494 - 495
Copyright
Copyright © International Astronomical Union 2008

References

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