HST NICMOS Observations of FSC10214+4724
  High-resolution, 1.10, 2.05, 2.12, and 2.15 micron imaging of the gravitationally lensed system FSC10214+4724 are presented. These data extend HST observations of the lens system to redder wavelengths, thus providing the highest resolution images to date of the rest-frame optical and narrow-line (i.e., H-alpha+[N II]) regions of the background quasar. The length of the arc in the wide-band continuum images increases with increasing wavelength, and the H-alpha+[N II] emission has a length in between that of the 1.10 and 2.05 microns. The structure of the arc changes from having an eastern and western peak at 1.10 microns to a single peak in the center at 2.05 microns. The changing structure and length of the arc can be understood in terms of a model where the background quasar consists of a region of scattered AGN light that dominates at 1.10 microns (rest-frame 3300 angstroms), surrounded by a more extended narrow-line region. An even more extended red stellar population would thus contribute light at 2.05 microns... 
A.S. Evans (Caltech), N.Z. Scoville, N. Dinshaw, L. Armus, B.T.   Soifer, G. Neugebauer, M. Rieke