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

Tripodi, Roberta (avtor), Martis, Nicholas S. (avtor), Markov, Vladan (avtor), Bradač, Maruša (avtor), Rihtaršič, Gregor (avtor), Harshan, Anishya (avtor), Judež, Jon (avtor), Felicioni, Giordano (avtor)

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 $z_{\mathrm{spec}}=8.6319$, hosting an active galactic nucleus. Its spectrum exhibits broad H$\beta\lambda$4863 Å emission, high-ionization lines (C iv, N iv]), high electron temperature, which are indicative of active galactic nucleus activity, and low metallicity ($Z$ < 0.1-0.2$Z_{\odot}$). The inferred black hole mass, $M_{\mathrm{BH}}=1.0^{+0.6}_{-0.4} \times 10^8 \mathrm{M}_{\odot}$, 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 $M_{\mathrm{BH}}-M*$ 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 $z=6$.

• Jezik: Angleški jezik
• Ključne besede: astrophysics, early universe, galaxies, supermassive black holes
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 16 str.
• Številčenje: Vol. 16, art. no. 9830
• PID: 20.500.12556/RUL-176105
• UDK: 524.882
• ISSN pri članku: 2041-1723
• DOI: 10.1038/s41467-025-65070-x
• COBISS.SI-ID: 258153731
• Datum objave v RUL: 21.11.2025

Gradivo je del revije

• Naslov: Nature communications
• Skrajšan naslov: Nat. Commun.
• Založnik: Nature Publishing Group
• ISSN: 2041-1723
• COBISS.SI-ID: 2315876

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: astrofizika, zgodnje vesolje, galaksije, supermasivne črne luknje