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Spatially Resolved H2O Masers as Probes of Supersonic Turbulence

Published online by Cambridge University Press:  12 April 2016

V. S. Strelnitski ,
J. Alexander ,
J. M. Moran  and
M. J. Reid
V. S. Strelnitski
Affiliation:
National Air and Space Museum, Smithsonian Institution, Washington DC and New Mexico Institute of Mining and Technology, Socorro, NM, USA
J. Alexander
Affiliation:
New Mexico Institute of Mining and Technology, Socorro, NM, USA
J. M. Moran
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
M. J. Reid
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA

Abstract

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VLBI of the H2O maser sources associated with outflows from young stars reveals, besides the regular velocity component (expansion and rotation), a random component suggestive of highly supersonic turbulence generated by the interaction of the star’s jets with the quiescent ambient gas. Our analysis of the geometry and velocity statistics in Sgr B2(M)–H2O demonstrates low fractal dimension of the turbulence and strong deviations of the velocity increments from Gaussian statistics—both indicating strong intermittency of the turbulent energy dissipation. These properties are discussed, along with the two-point velocity scaling law, and compared with the related properties of incompressible turbulence.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 369 - 370
Copyright
Copyright © Astronomical Society of the Pacific 1998