Lee Hartmann

TL;DR: In this article, a new analysis of data from simulations of globally gravitationally collapsing clouds of progenitor gas is presented to answer questions about sub-structured star formation in the context of cold collapse.

TL;DR: In this article, the authors present radiation-magnetohydrodynamic simulations aimed at studying evolutionary properties of H\,{ ormalsize II} regions in turbulent, magnetised, and collapsing molecular clouds formed by converging flows in the warm neutral medium.

TL;DR: In this article, it is suggested that the chaotic velocity fields result from a recent merger or collision with another small system or gas cloud(s) and the close, small, gas-rich companions of both NGC 4214 and NGC 4449 lend support to this hypothesis.

TL;DR: The presence of debris disks around D1 Gyr old main-sequence stars suggests that an appreciable amount of dust may persist even in mature planetary systems as discussed by the authors, which suggests that far-infrared and submillimeter observations are powerful tools for probing the outer regions of extrasolar planetary systems.

TL;DR: In this article, the self-gravitational collapse of an initially sheet-like, nonrotating cloud is considered, with rotation at a wide range of initial rates (10-15 to 10-13 rad s-1).