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Abstract Recent discoveries of faint active galactic nuclei (AGN) at the redshift frontier have revealed a plethora of broad Hα emitters with optically red continua, named little red dots (LRDs)1, which comprise 15–30% of the high-redshift broad-line AGN population2. Owing to their peculiar properties3,4,5,6, modelling LRDs with standard AGN scenarios has proven challenging.
Abstract Multiple theories have been proposed to describe the formation of black hole seeds in the early Universe and to explain the emergence of very massive black holes observed in the first billion years after Big Bang1–3. Models consider different seeding and accretion scenarios4–7, which require the detection and characterisation of black holes in the first few hundred million years after Big Bang to be validated.
Author notes These authors contributed equally: Irene Shivaei, Renske Smit Authors and Affiliations Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, UK Joris Witstok, Roberto Maiolino, Mirko Curti, Francesco D’Eugenio, Tobias J. Looser, William M. Baker, Lester Sandles, Jan Scholtz & Sandro Tacchella Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, UK Joris Witstok, Roberto Maiolino, Mirko Curti, Francesco D’Eugenio, Tobias J.
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