ARlogo Annu. Rev. Astron. Astrophys. 2000. 38: 761-814
Copyright © 2000 by Annual Reviews. All rights reserved

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Reinhard Genzel 1, 2 and Catherine J. Cesarsky 3, 4

1 Max-Planck Institut für extraterrestrische Physik (MPE), Garching, FRG;
2 Department of Physics, University of California, Berkeley
3 Service d'Astrophysique, DAPNIA/DSM, CEA Saclay, France
4 European Southern Observatory, Garching, FRG;

Abstract. More than a decade ago the IRAS satellite opened the realm of external galaxies for studies in the 10 to 100 µm band and discovered emission from tens of thousands of normal and active galaxies. With the 1995-1998 mission of the Infrared Space Observatory 1, the next major steps in extragalactic infrared astronomy became possible: detailed imaging, spectroscopy, and spectrophotometry of many galaxies detected by IRAS, as well as deep surveys in the mid- and far-IR. The spectroscopic data reveal a wealth of detail about the nature of the energy source(s) and about the physical conditions in galaxies. ISO's surveys for the first time explore the infrared emission of distant, high-redshift galaxies. ISO's main theme in extragalactic astronomy is the role of star formation in the activity and evolution of galaxies.

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1 The Infrared Space Observatory (ISO) is a project of the European Space Agency (ESA). The satellite and its instruments were funded by the ESA member states (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of the Japanese Space Agency ISAS and NASA. Back.