Persistence of Galactic turbulence-mode behavior beyond the Milky Way

Determine whether the variation in solenoidal and compressive turbulence modes observed among Galactic molecular clouds persists in molecular clouds beyond the Milky Way.

Background

The paper motivates extragalactic turbulence-mode studies by noting that Galactic molecular clouds exhibit substantial variations in the balance between compressive and solenoidal motions, with implications for cloud structure and star formation efficiency. It identifies the extension of this behavior to external galaxies as unresolved because extragalactic molecular clouds are difficult to study systematically and are generally observed with limited spatial resolution and dynamic range.

Although the paper measures the solenoidal fraction in a selected sample of molecular clouds in M33, it does not establish whether the broader patterns of turbulence-mode variation found in the Milky Way persist generally beyond the Milky Way. The question remains relevant for separating universal cloud-scale physics from effects associated with galactic environment.