Solid H2 in the interstellar medium

The Local Interstellar Medium

Substantial progress in the field of the Local Interstellar Medium has been largely due to recent launches of space missions, mostly in the UV and X–ray domains, but also to ground-based observations, mainly in high resolution spectroscopy. However, a clear gap seems to remain between the wealth of new data and the theoretical understanding. This paper gives an overview of some observational as...

The Local Interstellar Medium

The Local Interstellar Medium (LISM) is a unique environment that presents an opportunity to study general interstellar phenomena in great detail and in three dimensions. In particular, high resolution optical and ultraviolet spectroscopy have proven to be powerful tools for addressing fundamental questions concerning the physical conditions and three-dimensional (3D) morphology of this local m...

Reactions Involving the Nuclear Spin Modifications of H3 and H2; Implications for the Interstellar Medium

The Interstellar Medium of Iras

We confirm the first detection of themolecular ionH3 in an extragalactic object, the highly obscured ultraluminous galaxy IRAS 08572+3915 NW.We also have detected absorption lines of the fundamental band of CO in this galaxy. The CO absorption consists of a cold component close to the systemic velocity and warm, highly blueshifted and redshifted components. The warm blueshifted component is rem...

The Interstellar Medium in the Magellanic Bridge

HST ultra-violet and ground-based optical spectroscopy are presented for DI 1388, an early-type star in the Magellanic Bridge. These data have been supplemented with H I radio mapping of its environment. The spectroscopy shows interstellar components at LSR velocities of 0, 90 and 200 km s-l corresponding to the local ISM, a high velocity cloud and the Magellanic Bridge ISM, respectively. The l...