Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-22
Astronomy and Astrophysics
Astrophysics
8 pages. Accepted for publication in ApJ Letters
Scientific paper
10.1086/311521
We present deep galaxy counts and half-light radii from F160W ($\lambda_c=1.6\mu$) images obtained with NICMOS on HST. Nearly 9 arcmin$^2$ have been imaged with camera 3, with $3\sigma$ depths ranging from H = 24.3 to 25.5 in a 0.6$''$ diameter aperture. The slope of the counts fainter than H~$= 20$ is 0.31, and the integrated surface density to H$\leq 24.75$ is $4 \times 10^5$ galaxies per square degree. The half-light radii of the galaxies declines steeply with apparent magnitude. At H~$=24$ we are limited by both the delivered FWHM and the detection threshold of the images.
McCarthy Patrick
Storrie-Lombardi Lisa
Weymann Ray
Yan Lin
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