IRAS Explanatory Supplement
VII. Analysis of Processing
A. Overview
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The purpose of this chapter is to describe the general characteristics
of the catalogs of point and small extended sources and of the sky brightness
images. The distribution on the sky of different types of infrared sources
is presented not for scientific purposes, but to provide a context within
which to interpret the characteristics of specific objects (Section
VII.B). Detailed discussions are presented of the positional and photometric
accuracy of the point sources (Sections VII.C,D).
Although the important questions of the completeness and reliability of
the catalogs are deferred until the next chapter, some of the results of
the processing relevant to these topics are discussed in Sections VII.E
and VII.F. An overview of the results of associating
IRAS sources with objects appearing in other catalogs is given in Section
VII.G. Because it is crucial that the user gain an understanding of
the various flags that accompany the observations of a source, the properties
of these flags, in particular the threshold values that indicate that the
measurement of a source may be suspect, are described in Section
VII.H. The properties of the catalog of small extended sources are
presented in Section VII.I. The extended emission
images are discussed in Section VII.J.
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