The Relation Between Variances of a 3D Density and Its 2D Column Density Revisited

Heesun Yoon, Jungyeon Cho

We revisit the relation between the variance of three-dimensional (3D) density (${\sigma }_{\rho }^2$) and that of the projected two-dimensional (2D) column density (${\sigma }_{\Sigma }^2$) in turbulent me…