Three-micron Imaging of the Hubble Deep Field

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Images of the Hubble Deep Field at 3.2 μm , taken with the 10-m Keck Telescope, are presented. The images cover a total area of 2.5 arcmin2. To a 5-sigma limit of [3.2] total 17.5 mag (Vega-relative), 11 sources are detected, 9 of which are extragalactic. The integrated galaxy number counts are therefore 1.3x 104 deg-2 to this depth. The sources detected at 3.2 μm have a median redshift of z= 0.56. All 3.2 μm sources have 1.6 μm , 1.1 μm and visual counterparts, all of fairly regular morphologies; several also have 6.7 μm , 15 μm , 850 μm , 8.5 GHz, or 1.4 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 μm data seemed likely. Financial support was provided by NASA and the NSF.

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