Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..365..196s&link_type=abstract
SINS - Small Ionized and Neutral Structures in the Diffuse Interstellar Medium ASP Conference Series, Vol. 365, Proceedings of t
Astronomy and Astrophysics
Astronomy
Scientific paper
Water masers were historically the first understood indicators of powerful gas outflows from young stellar objects (YSOs). Subsequent studies demonstrated strong signatures of intermittent turbulent motion in these sources - a power-law velocity spectrum, a fractal spatial structure, and non-Gaussian statistics of velocity increments. This makes H2O masers a potentially valuable probe of highly supersonic turbulence. Comparison of the observed VLBI maps with recent computer simulations of maser propagation in turbulent media indicate that the observed maser ``hot spots'' are physically isolated structures, not a mere optical effect. The observed sizes of H2O condensations are close to the hypothetical ``shock-wave dissipation scale'' of supersonic turbulence. Connection with small-scale random shocks dissipating the bulk of turbulent energy can also be a solution for the problem of pumping these extremely bright masers.
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