Extreme properties of a compact and massive accreting black hole host in the first 500 Myr

Roberta Tripodi (), Nicholas Martis, Vladan Markov, Maruša Bradač, Fabio Di Mascia, Vieri Cammelli, Francesco D’Eugenio, Chris Willott, Mirko Curti, Maulik Bhatt, Simona Gallerani, Gregor Rihtaršič, Jasbir Singh, Gaia Gaspar, Anishya Harshan, Jon Judež, Rosa M. Merida, Guillaume Desprez, Marcin Sawicki, Ilias Goovaerts, Adam Muzzin, Gaël Noirot, Ghassan T. E. Sarrouh, Roberto Abraham, Yoshihisa Asada, Gabriel Brammer, Vicente Estrada-Carpenter, Giordano Felicioni, Seiji Fujimoto, Kartheik Iyer, Lamiya Mowla and Victoria Strait
Additional contact information
Roberta Tripodi: University of Ljubljana, Faculty of Mathematics and Physics
Nicholas Martis: University of Ljubljana, Faculty of Mathematics and Physics
Vladan Markov: University of Ljubljana, Faculty of Mathematics and Physics
Maruša Bradač: University of Ljubljana, Faculty of Mathematics and Physics
Fabio Di Mascia: Scuola Normale Superiore
Vieri Cammelli: University of Trieste, Astronomy Unit, Department of Physics
Francesco D’Eugenio: University of Cambridge, Kavli Institute for Cosmology
Chris Willott: NRC Herzberg
Mirko Curti: European Southern Observatory
Maulik Bhatt: Scuola Normale Superiore
Simona Gallerani: Scuola Normale Superiore
Gregor Rihtaršič: University of Ljubljana, Faculty of Mathematics and Physics
Jasbir Singh: INAF—Osservatorio Astronomico di Brera
Gaia Gaspar: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Anishya Harshan: University of Ljubljana, Faculty of Mathematics and Physics
Jon Judež: University of Ljubljana, Faculty of Mathematics and Physics
Rosa M. Merida: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Guillaume Desprez: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Marcin Sawicki: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Ilias Goovaerts: Space Telescope Science Institute
Adam Muzzin: York University, Department of Physics and Astronomy
Gaël Noirot: Space Telescope Science Institute
Ghassan T. E. Sarrouh: York University, Department of Physics and Astronomy
Roberto Abraham: University of Toronto, David A. Dunlap Department of Astronomy and Astrophysics
Yoshihisa Asada: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Gabriel Brammer: University of Copenhagen, Niels Bohr Institute
Vicente Estrada-Carpenter: Saint Mary’s University, Department of Astronomy and Physics and Institute for Computational Astrophysics
Giordano Felicioni: University of Ljubljana, Faculty of Mathematics and Physics
Seiji Fujimoto: University of Toronto, David A. Dunlap Department of Astronomy and Astrophysics
Kartheik Iyer: Columbia University, Columbia Astrophysics Laboratory
Lamiya Mowla: Wellesley College, Whitin Observatory, Department of Physics and Astronomy
Victoria Strait: University of Copenhagen, Niels Bohr Institute

Nature Communications, 2025, vol. 16, issue 1, 1-16

Abstract: Abstract Little red dots (LRDs) are a high redshift galaxy population. Despite their high number densities, their nature is still uncertain. Here we present CANUCS-LRD-z8.6, a spectroscopically confirmed little red dot at a spectroscopic redshift of zspec = 8.6319, hosting an active galactic nucleus. Its spectrum exhibits broad Hβλ4863 Å emission, high-ionization lines (C iv, N iv]), high electron temperature, which are indicative of active galactic nucleus activity, and low metallicity (Z

Date: 2025
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DOI: 10.1038/s41467-025-65070-x

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