Summary: THE HOST GALAXIES OF Z ß 2 RADIOQUIET QSOS
ITZIAR ARETXAGA, B.J. BOYLE AND R.J. TERLEVICH
Royal Greenwich Observatory
Madingley Road. Cambridge CB3 0EZ. UK.
Based on an Rband imaging survey of highredshift (z ß 2) QSOs with
the 4.2m WHT, we report the detection of extensions to the nuclear PSFs
of two radioquiet and one radioloud QSO. The extensions are most likely
host galaxies, with luminosities of at least 3 \Gamma 7% of the QSO luminosity.
The most likely values for the luminosities lie in the range 6 \Gamma 18% of the
QSO luminosity (R ¸ 19:8 \Gamma 20:9 mag). Our observations show that, if
the extensions we have detected are indeed galaxies, extraordinary massive
and luminous galaxies are not only characteristic of radioloud objects, but
of QSOs as an entire class. For a detailed description of this work, see
Aretxaga, Boyle & Terlevich (1995) MNRAS, 275, L27.
Figure 1: The left panel shows a 50 00
\Theta 50 00
field of one of the radioquiet QSOs
(1630.5+3749) for which we have found and extension to its nuclear PSF. The right
pannel shows the field after subtracting a 2D PSF profile to both QSO and stars. Note
that the stars are subtracted while the QSO is left with significant residuals (? 3oe).