Properties of 13CO structures

Using the ^13^CO (J=1-0) data from the Milky Way Imaging Scroll Painting survey, we built a sample with 360 structures having relatively accurate distances obtained from either the reddened background stars with Gaia parallaxes or associated maser parallaxes, spanning from 0.4 to ~15kpc.

Using this sample and about 0.3 million pixels, we analyzed the correlations between velocity dispersion, surface/column density, and spatial scales. Our structure-wise results show power-law indices smaller than 0.5 in both the {sigma}_v_-Reff and {sigma}_v_-Reff.{SIGMA} relations. In the pixel-wise results, the {sigma}^pix^_v_ is statistically scaling with the beam physical size (Rs={THETA}D/2) in form of {sigma}^pix^_v_{prop.to}Rs^0.43+/-0.03^.