Deep <i>H</i>-band galaxy counts and half-light radii from <i>Hubble Space Telescope</i> NICMOS parallel observations

We present deep galaxy counts and half-light radii from F160W (lambda(c) = 1.6 mu m) images obtained with the Near-Infrared Camera and Multiobject Spectrograph on the Hubble Space Telescope. 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 less than or equal to 24.75 is 4 x 10(5) galaxies deg(-2). The half-light radii of the galaxies decline steeply with apparent magnitude. At H = 24, we are limited by both the delivered FWHM and the detection threshold of the images.