Infrared Imaging of the Gravitational Lens PG 1115+080 with the Subaru   Telescope
  We present high spatial resolution images of the gravitational-lens system PG 1115+080 taken with the near-infrared camera (CISCO) on the Subaru telescope. The FWHM of the combined image is $0.''32$ in the $K'$-band, yielding spatial resolution of $0.''14$ after a deconvolution procedure. This is a first detection of an extended emission adjacent to the A1/A2 components, indicating the presence of a fairly bright emission region with a characteristic angular radius of $\sim$ 5 mas (40 pc). The near-infrared image of the Einstein ring was extracted in both the $J$ and $K'$ bands. The $J-K'$ color is found to be significantly redder than that of a synthetic model galaxy with an age of 3 Gyr, the age of the universe at the quasar redshift. 
F. Iwamuro, K. Motohara, T. Maihara, J. Iwai, H. Tanabe, T. Taguchi,   R. Hata, T. Terada, M. Goto, S. Oya, Subaru project team