Probing Turbulence in the Interstellar Medium using Radio-Interferometric Observations of Neutral Hydrogen

Understand

We develop a visibility based power spectrum estimator to probe the power spectrum directly from the interferometric observations and also estimate the errors in it.

• A numerical simulation of synthetic observations is also performed to access the efficacy and limitations of this estimator.
• We use this estimator to evaluate the power spectrum of three individual spiral galaxies, a dwarf galaxy sample and THINGS * spiral galaxies.
• In each case, the power spectrum is found to follow a power law PHI (U) = AU {\alpha} over a specific length scale range.