Statistics – Computation
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812926m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #129.26; Bulletin of the American Astronomical Society, Vol. 43, 2011
Statistics
Computation
Scientific paper
Recent observational and computational results have begun to indicate the importance of ambipolar diffusion in star formation. Li & Houde have reported observations of star-forming regions where the observed line widths of ionized and neutral molecules differed. Balsara & Tilley show that this phenomenon can be reproduced in two-fluid MHD simulations. In this work, we present new high resolution 3-D simulations of two-fluid turbulence using the RIEMANN code which illustrate the importance of two-fluid effects. We show that a difference develops in the normalized power spectra for the ion and the neutral species. Synthetic line profiles show a marked difference between ion neutral line widths on different length scales, which indicates that ambipolar diffusion may have an observational signature. Structure functions and two-dimensional spectra are also analyzed and their dependence on ionization fraction has been catalogued.
Deducing the orientation of the magnetic field relative to the observational line of sight has proved one of the greatest observational challenges. We show via simulations that there is an observationally significant difference between the ion and neutral line profiles when the magnetic field is aligned with our line of sight as opposed to when it is orthogonal to our line of sight.
Balsara Dinshaw S.
Meyer Chad
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