Proposal code
v077
Proposal title
VSOP Observations of OH masers - interstellar scattering and the structure of
The |
Investigators and their |
Affiliations |
| P.I. |
R.S. Booth |
Onsala Space Observatory |
| |
P.J. Diamond |
NRAO, Socorro |
| |
M. Lindqvist |
Onsala Space Observatory |
| |
A.J. Kemball |
NRAO, Socorro |
Proposal Abstract
In order to investigate interstellar scattering and its repercussions for
Space VLBI of OH masers, we have tried to
measure the apparent sizes of different types of maser as a
function of baseline and
their Galactic coordinates. Many Type I masers are fully resolved
on baselines of 35
megalambda, however, some still have significant correlated flux. Indeed,
the 1720 MHz maser spots in W3 are barely resolved, a result which may be
understood in terms of the geometrical beaming model (Gray et al.).
The same theory also predicts that the size of the 1665 MHz spots are
intrinsic sizes, making it important to investigate the partially resolved
sources and the W3 1720 MHz maser at the higher resolution given by VSOP.
The masers associated with IR stars also show measureable correlated flux
on the longest Earth baselines, although their visibility curves are
complex. We will attempt to measure their intrinsic structure
with VSOP.
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