Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-09
Astronomy and Astrophysics
Astrophysics
39 pages including 10 figures; Lecture notes from the Les Houches Summer School "Infrared Astronomy: Today and Tomorrow," Augu
Scientific paper
This review addresses what can be learned from infrared observations about galaxies powered predominantly by star formation. Infrared techniques mostly probe the interstellar medium of galaxies, yielding physical and chemical information on the medium out of which stars form, which is in turn affected by those stars. Methods traditionally used in the study of such normal galaxies at wavelengths longer than 3 microns are described, and major questions currently pursued in the field are outlined. The most prominent results from the IRAS survey are reviewed. Contributions by ISO in the field of broad-band photometry are then presented, followed by ISO results in spectrospcopy. Normal galaxy studies not directly concerned with the ISM are quickly reviewed. The outlook and challenges in pursuing the interpretation of infrared data on the ISM are discussed.
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