Fine structure and refractive scattering of the H2O maser in star-forming region W49N
Abstract
We used the unprecedented resolution of ∼25 μas of the VLBI array formed with the RadioAstron satellite to study the structures of H2O maser spots in the star forming region W49N. We found that anisotropic diffractive scattering of the ISM dominates the images of the maser spot, but does not completely blur them. The refractive scattering floor is about 0.001 in visibility at a baseline of 8 Gλ.
- Publication:
-
Cosmic Masers: Proper Motion Toward the Next-Generation Large Projects
- Pub Date:
- 2024
- DOI:
- Bibcode:
- 2024IAUS..380..238S
- Keywords:
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- Water masers;
- interstellar scattering;
- space VLBI