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Fine structure and refractive scattering of the H2O maser in star-forming region W49N

Published online by Cambridge University Press:  07 February 2024

N. N. Shakhvorostova Open the ORCID record for N. N. Shakhvorostova [Opens in a new window] ,
J. M. Moran Open the ORCID record for J. M. Moran [Opens in a new window] ,
A. V. Alakoz ,
H. Imai ,
C. R. Gwinn  and
A. M. Sobolev
N. N. Shakhvorostova*
Affiliation:
Astro-Space Center of the P.N. Lebedev Institute of RAS, Russia.
J. M. Moran
Affiliation:
Center for Astrophysics | Harvard & Smithsonian, USA
A. V. Alakoz
Affiliation:
Astro-Space Center of the P.N. Lebedev Institute of RAS, Russia.
H. Imai
Affiliation:
Center for General Education, Institute for Comprehensive Education, Kagoshima University, Japan
C. R. Gwinn
Affiliation:
University of California at Santa Barbara, USA
A. M. Sobolev
Affiliation:
Astronomical Observatory, Ural Federal University, Russia
*
email: [email protected]
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Abstract

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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.

Keywords

Water masersinterstellar scatteringspace VLBI
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 238 - 239
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

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