Abstract
The spectra of several H2O maser sources exhibit single λ0 = 1.35 cm maser lines with narrow asymmetric profiles. We consider the hyperfine structure of the line that corresponds to the transition between the rotational 616 → 523 levels of ortho-H2O molecules to account for the line asymmetry. Our numerical simulations of the maser line profile agree well with the observations if the hyperfine structure is taken into account.
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Varshalovich, D.A., Ivanchik, A.V. & Babkovskaya, N.S. The λ0 = 1.35 cm H2O maser line: The hyperfine structure and profile asymmetry. Astron. Lett. 32, 29–38 (2006). https://doi.org/10.1134/S1063773706010051
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DOI: https://doi.org/10.1134/S1063773706010051