Deep H-band Galaxy Counts and Half-light Radii from HST/NICMOS Parallel Observations

Details Deep H-band Galaxy Counts and Half-light Radii from HST/NICMOS Parallel Observations Deep H-band Galaxy Counts and Half-light Radii from HST/NICMOS Parallel Observations

1998-04-22

arxiv.org/abs/astro-ph/9804234v1

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.

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