Space Densities and Emissivities of Active Galactic Nuclei at z > 4

• Published in: The Astrophysical journal Vol. 884; no. 1; pp. 19 - 52
• Main Authors: Giallongo, E., Grazian, A., Fiore, F., Kodra, D., Urrutia, T., Castellano, M., Cristiani, S., Dickinson, M., Fontana, A., Menci, N., Pentericci, L., Boutsia, K., Newman, J. A., Puccetti, S.
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 10.10.2019; IOP Publishing
• Subjects: Active galactic nuclei; Astrophysics; Black holes; dark ages, reionization, first stars; Emissivity; Galaxies; galaxies: active; Image detection; Intergalactic media; Ionization; Luminosity; Photoionization; Photometry; Polls & surveys; quasars: general; Red shift; Space density; Supermassive black holes

The study of the space density of bright active galactic nuclei (AGNs) at z > 4 has been subject to extensive effort given its importance in the estimation of cosmological ionizing emissivity and growth of supermassive black holes. In this context we have recently derived high space densities of...