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A Census of Low Redshift AGNs

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posted on 12.05.2022, 03:58 by MADHOOSHI RUWANPURA SENARATH
Active galactic nuclei (AGNs), powered by the infall of gas towards black holes, are extremely powerful celestial objects, but can be hidden from view and thus missed by astronomical surveys. In this thesis we have searched for AGNs with changing spectra and surveyed for AGNs using infrared light and optical spectroscopy. We have identified two previously unknown “changing look AGNs,” whose spectra have changed during the past twenty years. We have uncovered hundreds of obscured AGNs using infrared light, which would not have been readily identified by optical AGN surveys.


Campus location


Principal supervisor

Michael Brown

Additional supervisor 1

Michelle Cluver

Year of Award


Department, School or Centre

Physics and Astronomy


Doctor of Philosophy

Degree Type



Faculty of Science