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D. W. Hogg, G. Neugebauer (IAS), J. G. Cohen (Caltech), M. E. Dickinson, S. G. Djorgovski, K. Matthews (STScI), B. T. Soifer (Caltech)
Images of the Hubble Deep Field at 3.2~{\rm \mu m}, taken with the 10-m Keck Telescope, are presented. The images cover a total area of ~2.5~{\rm arcmin2}. To a 5-sigma limit of [3.2]\rm total\approx 17.5~{\rm mag} (Vega-relative), 11 sources are detected, 9 of which are extragalactic. The integrated galaxy number counts are therefore ~1.3\times 104~{\rm deg-2} to this depth. The sources detected at 3.2~{\rm \mu m} have a median redshift of z= 0.56. All 3.2~{\rm \mu m} sources have 1.6~{\rm \mu m}, 1.1~{\rm \mu m} and visual counterparts, all of fairly regular morphologies; several also have 6.7~{\rm \mu m}, 15~{\rm \mu m}, 850~{\rm \mu m}, 8.5~{\rm GHz}, or 1.4~{\rm GHz} counterparts. No sources are found which are either anomalously red or anomalously blue in their H-[3.2] color, and there are significant detections of most of the known near-infrared HDF sources for which detection in these 3.2~{\rm \mu m} data seemed likely.
Financial support was provided by NASA and the NSF.
The author(s) of this abstract have provided an email address for comments about the abstract: hogg@ias.edu