Adaptive Optics observations of LBQS 0108+0028: K-band detection of the   host galaxy of a radio-quiet QSO at z=2
  We report the first unambiguous detection of the host galaxy of a normal radio-quiet QSO at high-redshift in K-band. The luminosity of the host comprises about 35% of the total K-band luminosity. Assuming the average colour of QSOs at z=2, the host would be about 5 to 6 mag brighter than an unevolved L* galaxy placed at z=2, and 3 to 4 mag brighter than a passively evolved L* galaxy at the same redshift. The luminosity of the host galaxy of the QSO would thus overlap with the highest found in radio-loud QSOs and radio-galaxies at the same redshift. 
I. Aretxaga (MPA, Germany), D. Le Mignant (ESO, Chile), J. Melnick   (ESO, Chile), R.J. Terlevich (RGO, UK), B.J. Boyle (AAO...