Normal Nearby Galaxies |
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Authors: | Marc Sauvage Richard J Tuffs Cristina C Popescu |
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Institution: | (1) CEA/DSM/DAPNIA/Service d'Astrophysique, C.E. Saclay, 91191 Gif sur Yvette CEDEX, France;(2) Astrophysics Department, Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany |
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Abstract: | Following on from IRAS, ISO has provided a huge advancement in our knowledge of the phenomenology of the infrared (IR) emission
of normal galaxies and the underlying physical processes. Highlights include the discovery of an extended cold dust emission
component, present in all types of gas-rich galaxies and carrying the bulk of the dust luminosity; the definitive characterisation
of the spectral energy distribution in the IR, revealing the channels through which stars power the IR light; the derivation
of realistic geometries for stars and dust from ISO imaging; the discovery of cold dust associated with H I extending beyond the optical body of galaxies; the remarkable similarity of the near-IR (NIR)/mid-IR (MIR) SEDs for spiral
galaxies, revealing the importance of the photo-dissociation regions in the energy budget for that wavelength range; the importance
of the emission from the central regions in shaping up the intensity and the colour of the global MIR luminosity; the discovery
of the “hot” NIR continuum emission component of interstellar dust; the predominance of the diffuse cold neutral medium as
the origin for the main interstellar cooling line, C II] 158 μm, in normal galaxies.
Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries:
France, Germany, The Netherlands, and the United Kingdom), and with the participation of ISAS and NASA. |
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Keywords: | galaxies: spiral galaxies: dwarf galaxies: ellipticals galaxies: ISM |
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