|Star Formation in X-ray Absorbed QSOs through cosmic time
|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&amp;lt;z&amp;lt;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.
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2012, OT1_mpage_1, SPG v14.2.0. https://doi.org/10.5270/esa-jj6ivik