Formation of star-forming clouds from the magnetised, diffuse interstellar medium

TL;DR

This paper investigates how star-forming molecular clouds form from the magnetized, diffuse interstellar medium, highlighting the ongoing challenge of understanding the generation of magnetically supercritical regions necessary for star formation.

Contribution

It provides a parameter study of 3D MHD simulations to explore the formation of supercritical regions in molecular clouds, addressing a key open problem.

Findings

Magnetic fields significantly influence the dynamics of the ISM.

The formation of supercritical regions remains an unresolved issue.

Simulations reveal complex interactions affecting cloud collapse.

Abstract

Molecular clouds, the birthplaces of stars in galaxies, form dynamically from the diffuse atomic gas of the interstellar medium (ISM). The ISM is also threaded by magnetic fields which have a large impact on its dynamics. In particular, star forming regions must be magnetically supercrit- ical in order to accomodate gas clumps which can collapse under their own weight. Based on a parameter study of three dimensional magneto-hydrodyamical (MHD) simulations, we show that the long-standing problem of how such supercritical regions are generated is still an open issue.