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VLBI Observations of Ammonia (9,6) Masers

Published online by Cambridge University Press:  07 August 2017

Preethi Pratap ,
Karl M. Menten ,
Mark J. Reid ,
James M. Moran  and
C. Malcolm Walmsley
Preethi Pratap
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138
Karl M. Menten
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138
Mark J. Reid
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138
James M. Moran
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138
C. Malcolm Walmsley
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69, D-5300 Bonn 1, Germany

Abstract

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We present the first VLBI measurement of interstellar ammonia (NH3) masers. Two masers were found toward the ultracompact Hii regions, W51-e1 and e2. The masers are unresolved in angle and smaller than 0.1 milliarcseconds. Unless these masers are highly beamed, they appear to be saturated.

Type
Chemistry of Interface Regions
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 345 - 346
Copyright
Copyright © Kluwer 1992 

References

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