Adaptive Optics imaging of Quasar Hosts
  We present the results of adaptive-optics imaging of 12 (z < 0.6) quasars in the H and K bands using the PUEO system mounted on the Canada-France-Hawaii telescope. The QSOs (m_V > 15.0) themselves are used as reference for the correction. The images, obtained under poor seeing conditions, have typical spatial resolution of FWHM ~ 0.3arcsec before deconvolution. The deconvolved H-band image of PG 1700+514 has a spatial resolution of 0.16arcsec and reveals a wealth of details on the companion and the host-galaxy. The comparison between the HST and CFHT images of PG 1700+514 shows how powerful and competitive ground-based AO can be. Close companions and obvious signs of interactions are found in 4 out of the 12 objects. The 2D images of 3 of the host-galaxies unambiguously reveal bars and spiral arms. The morphology of the other host-galaxies are difficult to determine from 1D surface brightness profiles and deeper images are needed that could be obtained with AO systems on 10m class telescopes. Analysis of mocked data shows that elliptical galaxies are always recognized as such, whereas disk hosts can be missed for small disk scale lengths and large QSO contributions. 
I. Marquez (Instituto de Astrofisica de Andalucia, CSIC) and P.   Petitjean (Institut d'Astrophysique de Paris)