IRAS Explanatory Supplement
V. Data Reduction
A. Overview
A.2 IRAS Catalogs and Atlases
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The results of the survey are to be found in either the catalogs of point sources or small extended sources, or in the catalog of low-resolution spectra or in the atlas of sky brightness images. Where the data for a given astronomical object are located depends primarily on its angular size. Sources with angular extents less than approximately 0.5, 0.5, 1.0, 2.0' (in the in-scan direction) at 12, 25, 60 and 100 µm, respectively, are listed in the point source catalog. As discussed in Chapter IX, low-resolution spectra in the 8-22 µm region are available for objects brighter than about 10 Jy at 12 or 25 µm. Sources with angular extents larger than the above values but less than about 8' may be found in the catalog of small extended sources. Information about sources larger than about 8' in-scan will be found only in the atlas of sky brightness images. The images have a pixel size of 2' and an angular resolution of 4-6'.
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