| Description |
The nature of the connection between the growth of a black hole via accretion and
that of its host galaxy bulge via star formation remains a fundamental
question in galaxy evolution. SCUBA/850micron observations of matched
samples of high redshift X-ray absorbed and unabsorbed QSOs demonstrated that
the X-ray absorbed QSO were far more likely to be detected suggesting that
their host galaxies had very high star formation rates. This result implies
that the zvirgul2 X-ray absorbed QSO population are undergoing the transition from the main
star forming phase and the QSO phase of a massive galaxy. Follow-up X-ray
observations of the absorbed X-ray QSOs found that the X-ray absorption is
due to an outflowing, ionized wind which is potentially the feedback invoked
by theorists to terminate star formation in the host galaxy. However, no
QSOs from the samples, X-ray absorbed or unabsorbed, were detected with SCUBA below z=1.5.
We propose SPIRE and PACS observations of a sample of 10 X-ray absorbed QSOs
in the 1<z<1.5 redshift range, with the aim of identifying the star-formation
properties of their host galaxies as well as their locus within the luminous
infrared galaxy population at these redshifts. Our sample is selected such
that it will enable us to probe the transition between the star-formation and
QSO phases of massive galaxies to lower redshifts than previously
and hence allow us to assess the differences (if any) in the relationship between accretion and
star formation in massive galaxies as a function of cosmic epoch. |
