This article gives an overview of the constitution, physical conditions, and observables of
dust in the interstellar medium of nearby galaxies. We first review the macroscopic, spatial …

Molecular absorption and emission bands dominate the visible, infrared, and submillimeter
spectra of most objects with associated gas. These observations reveal a surprisingly rich …

Self-assembly enables nature to build complex forms, from multicellular organisms to
complex animal structures such as flocks of birds, through the interaction of vast numbers of …

Observations of H+ 3 in the Galactic diffuse interstellar medium have led to various
surprising results, including the conclusion that the cosmic-ray ionization rate (ζ 2) is about …

Diffuse interstellar clouds have long been thought to be relatively devoid of molecules,
because of their low densities and high radiation fields. However, in the past ten years or so …

Using high-resolution infrared spectroscopy we have surveyed twenty sight lines for\mathrm
{H}\,^{+} _ {3} absorption.\mathrm {H}\,^{+} _ {3} is detected in eight diffuse cloud sight lines …

We carried out a comprehensive far-UV survey of 12 CO and H 2 column densities along
diffuse molecular Galactic sight lines. This sample includes new measurements of CO from …

Echelle spectra of HD 183143 [B7Iae, E (B− V)= 1.27] were obtained on three nights, at a
resolving power R= 38,000 and with a signal-to-noise ratio≈ 1000 at 6400 Å in the final …

We present maps at high spatial and spectral resolution in emission lines of CCH, cC 3 H 2,
C 4 H, 12 CO and C 18 O of the edge of the Horsehead nebula obtained with the IRAM …

Echelle spectra of the double-lined spectroscopic binary HD 204827 were obtained on five
nights, at a resolving power R= 38,000 and with a\mathrm {S}\,/\mathrm {N}\,= 750 near 6000 …