Little Red Dots from Low-Spin Galaxies at High Redshifts

Abraham Loeb

doi:10.3847/2515-5172/ad614c

Little Red Dots from Low-Spin Galaxies at High Redshifts

Cosmology and Nongalactic Astrophysics 2024-07-19 v1

Authors: Abraham Loeb

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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).

Keywords

high-redshift galaxies little red dots low-spin galaxies star formation supermassive black hole

Cite

@article{arxiv.2407.12965,
  title  = {Little Red Dots from Low-Spin Galaxies at High Redshifts},
  author = {Abraham Loeb},
  journal= {arXiv preprint arXiv:2407.12965},
  year   = {2024}
}

Comments

Published in RNAAS, 4 pages

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