Searching for (and finding!) the most distant quasars
Astronomy and astrophysics
Wednesday 24 February 2016
to 14:15 at
Daniel Mortlock (Imperial College, London)
Quasars are powerful probes of the early Universe, although until recently it has not been practical to search for quasars beyond a redshift of z > 6.5 because they have been identified primarily in optical surveys. Using data from the UKIRT Infrared Deep Sky Survey (UKIDSS), it has been possible to search beyond this optical limit. I will describe the latest results for this survey, focusing on the Bayesian search methodology and the implications for cosmological reionization and black hole evolution at a redshift of ~7.