VLBI Measurements of Interstellar Scattering Towards W49N

Details VLBI Measurements of Interstellar Scattering Towards W49N VLBI Measurements of Interstellar Scattering Towards W49N

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3709d&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #37.09; Bulletin of the American Astronomical Society, Vol. 25, p.855

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Scientific paper

We report on VLBI observations of OH masers in W49N. The angular sizes we measure for these masers, about 11 kpc distant, are greater than those of other closer OH masers. We believe that the masers have small intrinsic dimension, but suffer from heavy angular broadening by interstellar scattering. This is consistent with previous measurements of H_2O masers in the same region whose sizes are thought to be dominated by the effects of scattering. We discuss the implications of this measurement for turbulence in the interstellar medium. The masers are observed to have extremely narrow intrinsic linewidths. We suggest that, in future observations, narrower bandwidths and higher spectral resolution would increase sensitivity to faint maser features.

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