Extreme properties of a compact and massive accreting black hole host in the first 500 Myr
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 < 0.1−0.2Z⊙). The inferred black hole mass, MBH=1.0−0.4+0.6×108M⊙\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{{{{\rm{BH}}}}}=1.{0}_{-0.4}^{+0.6}\times 1{0}^{8}\,{{{{\rm{M}}}}}_{\odot }$$\end{document}, poses strong constraints on current black hole formation models and simulations. Additionally, its black hole is over-massive relative to its host, deviating from local MBH − M* relations, suggesting an early, rapid black hole growth preceding that of its galaxy. CANUCS-LRD-z8.6 may represent an evolutionary link between early massive black holes and the luminous quasars observed at z = 6. Little Red Dots (LRDs) are a high-redshift galaxy population with unclear nature. Here, authors show CANUCS-LRD-z8.6, a spectroscopically confirmed LRD, hosting an active galactic nucleus, and its properties provide insights for…
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