Probing interstellar turbulence in spiral galaxies using H i power spectrum analysis

► H i intensity fluctuation power spectrum for a sample of 18 spiral galaxies chosen from THINGS are estimated. ► Our analysis spans a large range of length-scales from ∼300 pc to ∼16 kpc across the entire galaxy sample. ► Power spectrum are well fitted by single power laws with the power law index in the range α = −1.9 to 1.5 for 60% of the galaxies. ► We find no significant correlation between α and the star formation rate, dynamical mass, H i mass or velocity dispersion of the galaxies.