Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000isass..14...59s&link_type=abstract
The Institute of Space and Astronautical Science Report SP No. 14, p. 59-65.
Astronomy and Astrophysics
Astronomy
Infrared Astronomy, Interstellar Medium, Infrared Spectroscopy, Infrared Space Telescopes
Scientific paper
The mid-infrared and far-infrared regions of the electromagnetic spectrum contain a rich assortment of spectral features which can be used as tracers of the physical properties of interstellar and circumstellar material. In the broadest sense, these features include the thermal blackbody emission from dust grains at a variety of temperatures, solid state vibrational modes in the refractory and icy components of dust grains, vibrational spectra of ``large'' molecules such as polycyclic aromatic hydrocarbons (PAHs), vibrational and rotational bands of simple molecules, atomic recombination lines in the lighter atoms, and fine-structure transitions in heavier atoms and ions. The spectroscopic possibilities in the infrared increase still further if highly red-shifted features from shorter wavelength regimes are considered. In the following, the types of spectroscopic observations enabled by access to mid- and far-infrared (here, roughly 5 micron to 30 micron, and 30 micron to 1 mm, respectively) spectra are briefly summarized.
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