Physics of Nonuniversal Larson’s Relation

Abstract From a new perspective, we reexamine self-gravity and turbulence jointly, in hopes of understanding the physical basis for one most important empirical relations governing clouds interstellar medium (ISM), Larson’s relation relating velocity dispersion ( σ R ) to cloud size ). We report on two key findings. First, correct form is , where α v virial parameter pc strength turbulence, if has Kolmogorov spectrum. Second, amplitude relation, not universal, differing by factor about 2 between Galactic disk those at center, as evidenced observational data.