|A Herschel SPIRE study of star-formation in the host galaxies of the most luminous high-redshift quasars
|We propose to use this final Herschel call to obtain SPIRE 250,350,500 micron images of a sample of nearly 300 of the most luminous quasars to have ever existed in the universe. Our proposed programme samples the top decade of quasar optical luminosities, over the key redshift range 2.5 &amp;lt; z &amp;lt; 4.5, which corresponds essentially to the 1-2 Gyr epoch over which such objects are found. This regime has been neglected by current Herschel programmes, and our targets are too rare on the sky for more than a handful to be contained within the existing-planned Herschel SPIRE surveys. Via careful sample construction, including matched sub-samples of radio-loud and radio-quiet SDSS quasars, we aim to determine how dust-enshrouded star-formation activity in the host galaxies of these super-massive active black holes depends on their redshifts, and their optical-radio power. This will allow fundamental tests of the proposed linkage between galaxy and black-hole growth, and possible modes of feedback which seem to be required to shut down star formation in massive galaxies at these high redshifts. We believe it would be a major missed opportunity if Herschel is not used to assemble a legacy dataset for these, the presumed progenitors of today.s most massive galaxies, especially since the data from this (relatively inexpensive) programme can ultimately be combined with comparable statistics on lower-luminosity quasars from the major SPIRE surveys such as H-ATLAS and HerMES (thus providing excellent coverage of the luminosity-redshift plane). Finally, since our quasar targets should mark some of the highest density regions in the young universe, we will explore the 12 sq arcmin sampled by Small-Map mode around each quasar to quantify the evidence for enhanced star-formation activity in the general vicinity of these quasar hosts, as anticipated if we are observing the progenitors of today.s massive galaxy clusters.
|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, 2013, OT2_jdunlop_1, SPG v14.1.0. https://doi.org/10.5270/esa-zdqjqt7