Infrared cirrus point sources

The IRAS discovered a large number of unresolved sources which were more intense at 100 microns than at shorter IR wavelengths. A sample of these point sources was isolated which are located in regions of very low Galactic H I column density. Whereas it was initially believed these sources to be prime candidates for a class of previously unknown astronomical object, the observations has proven that most of these sources are associated with the interstellar medium (ISM) of our Galaxy.