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Related papers: The Host Galaxy (If Any) of the Little Red Dots

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Recent JWST observations have revealed a population of red, compact, high-redshift objects called 'Little Red Dots'(LRD), whose host components have remained largely unconstrained, possibly due to their extreme compactness. Current…

We present simulated counterparts of the ``Little Red Dot'' (LRD) galaxies observed with JWST, using the large cosmological hydrodynamic simulation, ASTRID. We create mock observations of the galaxies ($5 \leq z \leq 8$) in ASTRID, and find…

Cosmology and Nongalactic Astrophysics · Physics 2026-01-21 Patrick LaChance , Rupert A. C. Croft , Tiziana Di Matteo , Yihao Zhou , Fabio Pacucci , Yueying Ni , Nianyi Chen , Simeon Bird

The discovery of Little Red Dots (LRDs) -- a population of compact, high-redshift, dust-reddened galaxies -- is one of the most surprising results from JWST. However, the nature of LRDs is still debated: does the near-infrared emission…

Astrophysics of Galaxies · Physics 2024-06-14 Tonima Tasnim Ananna , Ákos Bogdán , Orsolya E. Kovács , Priyamvada Natarajan , Ryan C. Hickox

One of the most remarkable discoveries of JWST is a population of compact, red sources at z > 4, commonly referred to as Little Red Dots (LRDs). Spectroscopic identifications reported that most LRDs are active galactic nuclei (AGNs), which…

JWST is revolutionizing our view of the early Universe by pushing the boundaries of detectable galaxies and black holes in redshift (upward) and mass (downward). The Little Red Dots (LRDs), detected by several surveys at $z > 4$, present a…

Astrophysics of Galaxies · Physics 2025-05-23 Emmanuel Durodola , Fabio Pacucci , Ryan C. Hickox

We measure host galaxy stellar masses for a sample of five luminous quasars at $z\sim5-7$. Using JWST/NIRCam medium-band images of nearby PSF reference stars, we carefully subtract the contribution from the quasar light to place upper and…

Astrophysics of Galaxies · Physics 2024-02-07 Meredith A. Stone , Jianwei Lyu , George H. Rieke , Stacey Alberts , Kevin N. Hainline

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

JWST has revealed a new high-redshift population called little red dots (LRDs). Since LRDs may be in the early phase of black hole growth, identifying them in the early universe is crucial for understanding the formation of the first…

Recent observations by the James Webb Space Telescope (JWST) have revealed a previously hidden population of extremely bright and compact objects between redshifts of $z \sim 4$ and $z \sim 10$. Given their extreme red colouring in the…

Astrophysics of Galaxies · Physics 2024-09-23 Jake Feeney , Patrick Kavanagh , John A. Regan

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…

We have obtained Near-Infrared Camera and Multi-Object Spectrometer images of 16 radio quiet quasars observed as part of a project to investigate the ``luminosity/host-mass limit.'' The limit results were presented in McLeod, Rieke, &…

Astrophysics · Physics 2009-10-31 K. K. McLeod , B. A. McLeod

A significant fraction of little red dots (LRDs) exhibit nearby extended emission of unknown origin. If physically associated with the LRD, this component may trace stellar emission from an off-centered host galaxy, neighboring companions,…

Astrophysics of Galaxies · Physics 2025-05-07 Chang-Hao Chen , Luis C. Ho , Ruancun Li , Kohei Inayoshi

We compile JWST/NIRSpec prism and MIRI data for 249 Little Red Dots (LRDs) at 2.3<z<9.3, forming a representative spectroscopic subset of NIRCam-selected LRDs. We derive a median stacked spectrum covering rest-frame 0.09-1.2 $\mu$m, with…

The James Webb Space Telescope (JWST) has revealed a previously unknown population of compact, red galaxies at $z \sim 5$, known as "Little Red Dots" (LRDs). With effective radii of $\sim 100$ pc and stellar masses of $10^9-10^{11} \,…

Astrophysics of Galaxies · Physics 2025-11-14 Fabio Pacucci , Lars Hernquist , Michiko Fujii

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 unprecedented sensitivity of the \textit{James Webb Space Telescope} (\textit{JWST}) has revolutionized our understanding of the early universe. Among the most intriguing \textit{JWST} discoveries are red, very compact objects showing…

Astrophysics of Galaxies · Physics 2025-02-07 Muhammad A. Latif , Ammara Aftab , Daniel J. Whalen , Mar Mezcua

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

Our knowledge of relations between supermassive black holes and their host galaxies at $z\gtrsim1$ is still limited, even though being actively sought out to $z\sim6$. Here, we use the high resolution and sensitivity of JWST to measure the…

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