Recent observations by the Midcourse Space Experiment ( MSX ) have revealed the presence of compact objects seen in absorption against bright mid-infrared emission from the Galactic plane. Examination of MSX and IRAS images of these objects reveal that they are dark from 7 to 100 μm. We find ~2000 clouds in a 1° × 180° scan along the Galactic equator. The data suggest these objects are dense ( n > 10 5 cm −3 ), cold ( T <20 K) cores, without accompanying envelopes.
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Egan et al. (1998) studied this question.
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