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First VLBI Observations of 6.3 cm OH Masers in Compact HII Regions

Published online by Cambridge University Press:  03 August 2017

A. Baudry ,
P. J. Diamond ,
D. Graham ,
M. Walmsley ,
R. Booth ,
N. Brouillet  and
G. Daigne
A. Baudry
Affiliation:
Observatoire de Bordeaux, 33270 Floriac, France
P. J. Diamond
Affiliation:
NRAO, Charlottesville, 2015 Ivy Rd, Charlottesville, VA 22903
D. Graham
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-5300 Bonn 1, FRG
M. Walmsley
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-5300 Bonn 1, FRG
R. Booth
Affiliation:
Onsala Space Observatory, S-43900 Onsala, Sweden
N. Brouillet
Affiliation:
Observatoire de Bordeaux, 33270 Floriac, France
G. Daigne
Affiliation:
Observatoire de Bordeaux, 33270 Floriac, France

Abstract

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VLBI synthesis observations of the 2Π1/2, J = 1/2 excited-state of OH at 6.3 cm (ΔF = 1–0 = 4765.562 MHz) have been made towards four compact HII regions. Detailed maps have been produced for W3(OH) where three groups of sources are distributed over a region ∼ 0.01 pc in size. The brightest sources are shown to be saturated masers with TB ≳ 109 K. In ONl a weak feature gives fringes with a ∼ 0.05″ lobe spacing.

Type
Galactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 235 - 236
Copyright
Copyright © Reidel 1988 

References

Baudry, A., Diamond, P.J., Graham, D., Walmsley, M., Booth, R., 1987, Astron. Astrophys., in preparation Google Scholar
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