Little Red Dots from Low-Spin Galaxies at High Redshifts

Abstract

Recently, a new population of compact, high-redshift (z>7) galaxies appeared as little red dots (LRDs) in deep JWST observations. The latest spectroscopic data indicates that these galaxies contain an evolved stellar population, reflecting an early episode of high star-formation-rate. The appearance of broad emission lines suggests that a central overmassive black hole also powers these galaxies. I propose that LRD galaxies represent the low-spin tail of the galaxy population. Low-spin galaxies host a more compact gaseous disk with an enhanced star formation rate relative to typical galaxies at the same redshift. The compact disk feeds efficiently a central black hole, as predicted by Eisenstein & Loeb (1995).

Published in RNAAS, 4 pages

References in corpus (5)

• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• Stress Testing $\Lambda$CDM with High-redshift Galaxy Candidates
• JWST CEERS & JADES Active Galaxies at z = 4-7 Violate the Local $M_{\bullet }-M_{\star }$ Relation at $>3\sigma$: Implications for Low-Mass Black Holes and Seeding Models
• RUBIES: Evolved Stellar Populations with Extended Formation Histories at $z\sim 7-8$ in Candidate Massive Galaxies Identified with JWST/NIRSpec
• The Redshift Evolution of the $M_{\bullet }-M_{\star }$ Relation for JWST's Supermassive Black Holes at $z>4$

Cited by in corpus (3)

• Little Red Dots Are Nurseries of Massive Black Holes
• Cosmic Outliers: Low-Spin Halos Explain the Abundance, Compactness, and Redshift Evolution of the Little Red Dots
• Mass and Spin Growth of Very Massive Stars in Star Clusters Potentially Associated with Little Red Dots