Uncovering the Multi-scale Mechanisms of Star Formation
Blakesley Burkhart (UW-Madison) - October 14, 2013 at 12:10 pm
It is generally accepted that magneto-gravitational turbulence is of critical importance to the star formation process, yet the full interplay between gravity, magnetic fields, and turbulent motions is not well understood and is highly scale dependent. In this talk I will discuss several new techniques to estimate key properties of turbulence from molecular line observations and dust emission maps as compared with MHD simulations with and without self-gravity. On the scales of GMCs, progress that has been made on measuring the turbulence velocity power spectrum with the Velocity Channel Analysis/ Velocity Coordinate Spectrum, which provides information about the turbulent cascade, injection scale and gas temperature. However, the density power spectrum taken from CO maps should be treated with care, as we have recently confirmed analytical predictions that the spectral index saturates to a universal value of -3 in an optically thick medium. Furthermore, using AMR simulations, I will show that signatures of gravitational collapse can be unveiled with the power spectrum and probability distribution functions in dust extinction and emission maps. I will highlight the importance of the magnetic field in the cloud collapse evolution.
The seminar will be held in B-1 Hearst Field Annex.
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