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C. C. Dudley (NRL), M. Imanishi (NAO, Japan), P. R. Maloney (U. Colorado)
For six of the 45 submillimeter sources recently cataloged in the GOODS-N field, there are no clear candidate 24 \mum counterparts within the 2\sigma radius error circles, whereas one would expect only a couple such cases. One explanation is that the redshifts are larger than 4 so that dust does not strongly emit in the observed 24 \mum passband. We have compared 3.6 or 4.5 \mum Spitzer GOODS data with I and Z band Hubble ACS GOODS data for these six error circles and find two sources detected at 3.6 \mum but undetected at I or Z. Supposing that rest frame far infrared ice emission can extend the redshift range over which submillimeter sources can be detected as we have recently proposed, the absence of I or Z band emission may possibly be explained by Gunn-Peterson saturation with the shortest detectable wavelength falling in the near infrared similar to HDF 850.1.
Infrared Astronomy at the Naval Research Laboratory is supported by the Office of Naval Research (USA).
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.