The host galaxy of Q 0151 1 048 A

We report the detection of the host Galaxy of the radio quiet QSO Q01511048A at z51.922. Deep U, B and I imaging of the QSO pair Q01511048A1B obtained at the Nordic Optical Telescope in good seeing has revealed a very luminous host (M ̄ 2 24 in all three bands assuming V 51) centred on the position of Q01511048A. The colours and extreme obs m brightness of this host galaxy resembles the ones reported for high redshift radio galaxies. The host galaxy of the 3.2 magnitudes fainter z 5 1.937 Q01511048B is marginally detected in our deepest image, which is in the B-band. This host galaxy is about 3 magnitudes fainter than the host galaxy of Q01511048A consistent with a strong correlation between QSO and host galaxy brightness.  2002 Elsevier Science B.V. All rights reserved.