Well over 100 submm-selected galaxies are now known (see Fig.
9), although their redshifts and detailed astrophysical
properties are very largely uncertain. The key information
available about their properties comes from observations of
discrete galaxies made using the SCUBA and MAMBO bolometer array
cameras at wavelengths of 450, 850 and 1200 µm. Counts of
distant galaxies at far-IR wavelengths of 95 and 175 µm have
also been measured using the PHOT instrument aboard ISO. Limits
to the counts at 2.8 mm have been obtained using the Berkeley-
Illinois-Maryland Association (BIMA) mm-wave interferometer. The
results of all the relevant observations are compiled in Figs. 9
and 10. Information is also available about the population of
mid-IR 15-µm sources using the CAM instrument aboard ISO
(Altieri et al., 1999; Elbaz et al., 1999): see Fig. 22. Figure
9. A summary of count data from several mm, submm and far-IR
surveys. The overplotted curves are derived in models that
provide good fits to the compilation of data