Chapter 4

Infrared astronomy
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Infrared sources...........................................160
 Stars.....................................................160
 Planetary nebula..........................................160
 H 1I regions..............................................160
 Molecular clouds..........................................161
 Galactic nucleus..........................................161
 Galactic nuclei...........................................161
 QSO.......................................................161
Infrared background........................................162
Atmospheric transmission...................................164
Source temperatures........................................165
 Brightness temperature....................................165
 Color temperature.........................................165
 Effective temperature.....................................165
Blackbody flux densities...................................165
Bibliography...............................................165

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