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The ``Little Red Dots'' (LRDs) are red and compact galaxies detected in JWST deep fields, mainly in the redshift range $z=4-8$. Given their compactness and the inferred stellar masses in the hypothesis that LRDs are starburst galaxies, the…

Astrophysics of Galaxies · Physics 2024-08-29 Carl Audric Guia , Fabio Pacucci , Dale D. Kocevski

The James Webb Space Telescope (JWST) observations have identified a class of compact galaxies at high redshifts ($4 \lesssim z \lesssim 11$), dubbed "little red dots" (LRDs). The supermassive black holes (SMBHs) of…

Cosmology and Nongalactic Astrophysics · Physics 2025-07-24 Borui Zhang , Wei-Xiang Feng , Haipeng An

Little Red Dots (LRDs), among the most enigmatic high-redshift discoveries by JWST, are commonly believed to be powered by accreting supermassive black holes. Here, we explore the possibility that these sources are globular clusters in…

The James Webb Space Telescope recently uncovered a population of massive black holes (BHs) in the first billion years after the Big Bang. Among these high-redshift BH candidates, observations have identified a class of active galactic…

Astrophysics of Galaxies · Physics 2025-08-21 Elia Cenci , Melanie Habouzit

The James Webb Space Telescope has detected massive black holes (BHs) with masses of $\sim 10^{6-8}~M_\odot$ within the first billion years of the universe. One of the remarkable findings is the identification of "Little Red Dots" (LRDs), a…

Astrophysics of Galaxies · Physics 2025-07-17 Kohei Inayoshi

The James Webb Space Telescope (JWST) has uncovered many compact galaxies at high redshift with broad hydrogen and helium lines, including the enigmatic population of little red dots (LRDs). The nature of these galaxies is debated and is…

I hypothesize a physical explanation for the "Little Red Dots" (LRDs) discovered by the James Webb Space Telescope (JWST). The first star formation in the universe occurs in dense clusters, some of which may undergo runaway collapse and…

Astrophysics of Galaxies · Physics 2025-04-24 Jillian Bellovary

Little Red Dots, discovered by the James Webb Space Telescope, are hypothesized to be active galactic nuclei containing a supermassive black hole, possibly surrounded by a dense stellar cluster, large amounts of gas, and likely by a…

High Energy Astrophysical Phenomena · Physics 2025-10-27 Konstantinos Kritos , Joseph Silk

The enigmatic Little Red Dots (LRDs) discovered by the James Webb Space Telescope (JWST) exhibit properties challenging their interpretation as common galaxies or Active Galactic Nuclei (AGN). Understanding their nature is key to placing…

Astrophysics of Galaxies · Physics 2026-04-01 Diego Herrero-Carrión , Daniele Spinoso , David Izquierdo-Villalba , Tong Su , Silvia Bonoli , Pablo Renard

Little Red Dots (LRDs) are enigmatic, compact, red galaxies at high redshift, $z\sim 4$-$7$, discovered by the James Webb Space Telescope. Broad emission lines in the absence of X-ray and radio counterparts suggest that they host accreting…

High Energy Astrophysical Phenomena · Physics 2026-04-29 Riku Kuze , Kunihito Ioka , Kohta Murase , Shigeo S. Kimura , Kohei Inayoshi

James Webb Space Telescope (JWST) has revealed a population of red and compact objects with a unique V-shape SED at z >= 4 known as Little Red Dots (LRDs). Most of the LRDs with existing spectral observations exhibit broad Balmer lines and…

Astrophysics of Galaxies · Physics 2026-01-06 Zijian Zhang , Linhua Jiang , Weiyang Liu , Luis C. Ho , Kohei Inayoshi

We investigate the possibility that the recently identified population of high-redshift, obscured quasars - known as "Little Red Dots" (LRDs) - originates from early black hole seed formation driven by ultra-strongly self-interacting dark…

Astrophysics of Galaxies · Physics 2026-03-10 M. Grant Roberts , Lila Braff , Aarna Garg , Stefano Profumo , Tesla Jeltema

The discovery by JWST of a substantial population of compact "Little Red Dots" (LRDs) presents a major puzzle: their observed spectra defy standard astrophysical interpretations. Here, we show that LRD spectra are naturally reproduced by…

Astrophysics of Galaxies · Physics 2026-01-22 Fabio Pacucci , Andrea Ferrara , Dale D. Kocevski

The James Webb Space Telescope (JWST) has uncovered an abundant population of compact, extremely red, and X-ray weak objects at $z\gtrsim4$, knows as ``Little Red Dots" (LRDs). These objects exhibit spectral energy distributions that…

Astrophysics of Galaxies · Physics 2024-10-29 Hai-Long Huang , Jun-Qian Jiang , Jibin He , Yu-Tong Wang , Yun-Song Piao

Little Red Dots (LRDs) are a newly identified class of active galactic nuclei (AGNs) uncovered by JWST deep surveys. Their enigmatic properties challenge the canonical AGN paradigm and have stimulated ideas on early massive black hole (BH)…

Astrophysics of Galaxies · Physics 2025-12-04 Kohei Inayoshi , Luis C. Ho

We present the properties of two candidate massive ($M_\star\sim10^{11}M_\odot$) and dusty ($A_{\rm v}>2.5$ mag) galaxies at $z=5-7$ in the first 0.28 deg$^2$ of the COSMOS-Web survey. One object is spectroscopically confirmed at $z_{\rm…

The Little Red Dots (LRDs) are high-redshift galaxies uncovered by JWST, characterized by small effective radii ($R_{\rm eff} \sim 80-300$ pc), number densities that are intermediate between those of typical galaxies and quasars, and a…

Astrophysics of Galaxies · Physics 2025-08-12 Fabio Pacucci , Abraham Loeb

The James Webb Space Telescope (JWST) observations have revolutionized extragalactic research, particularly with the discovery of little red dots (LRD), which we propose are dust-reddened broad-line active galactic nuclei (AGNs). Their…

Astrophysics of Galaxies · Physics 2025-02-06 Zhengrong Li , Kohei Inayoshi , Kejian Chen , Kohei Ichikawa , Luis C. Ho

As an unprecedented large population in the early universe, the JWST-discovered little red dots (LRDs) have garnered much attention for formation of massive black holes and galaxies, but their nature remains a mystery. The LRDs appearing as…

Astrophysics of Galaxies · Physics 2025-11-13 Jian-Min Wang , Yi-Lin Wang , Yong-Jie Chen , Jun-Rong Liu , Yu-Yang Songsheng , Cheng Cheng , Yan-Rong Li , Pu Du , Hao Zhang , Yu Zhao
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