Weekly issue

Week 15, 2026

Apr 6–12, 2026

Week 15, 2026 includes 4 curated papers, centered on LRD, spectroscopy, high-z.

2604.09177v1

The Cliff: A Metal-Poor Little Red Dot Hosting an Overmassive Black Hole at $z = 3.55$

Lucy R. Ivey, Francesco D'Eugenio, Roberto Maiolino, Yuki Isobe, Ignas Juodžbalis, Sophie Koudmani, Michele Perna, Saiyang Zhang, Volker Bromm, Andrew J. Bunker, Stefano Carniani, Andrew C. Fabian, Kohei Inayoshi, Xihan Ji, Gareth C. Jones, Boyuan Liu, Robert Pascalau, Pierluigi Rinaldi, Brant Robertson, Jan Scholtz, Sandro Tacchella

Theme match 5/5

Digest

This paper studies a metal-poor little red dot at z = 3.55 that appears to host an overmassive black hole. The main result is that the system combines low metallicity with black-hole-to-host properties that are hard to reconcile with simple local scaling expectations. The paper matters because it sharpens the argument that at least some LRD-like sources may trace unusually rapid or early black-hole growth.

Open paper page arXiv abstract arXiv PDF Highlighted PDF

Key figures to inspect

No figure recommendations stored yet.

GLIMPSED: Direct evidence for a fast AGN-driven outflow from a z=6.64 Little Red Dot host galaxy

Damien Korber, Rui Marques-Chaves, Daniel Schaerer, Gabriel Brammer, Archana Aravindan, Arghyadeep Basu, Qinyue Fei, Emma Giovinazzo, Vasily Kokorev, Alberto Saldana-Lopez, Maxime Trebitsch, Hakim Atek, John Chisholm, Ryan Endsley, Seiji Fujimoto, Lukas Furtak, Richard Pan, Rohan P. Naidu

Theme match 5/5

Digest

This paper presents direct evidence for a fast AGN-driven outflow in the host galaxy of a z = 6.64 little red dot. The main result is that spatially resolved spectroscopy isolates a very high-velocity outflow component associated with the AGN rather than with ordinary star formation. The paper matters because it ties the LRD phenomenon to concrete feedback physics in the host galaxy rather than only to spectral oddities near the nucleus.

Open paper page arXiv abstract arXiv PDF Highlighted PDF

Key figures to inspect

No figure recommendations stored yet.

Paschen Jumps in Little Red Dots: Evidence for Nebular Continua

Albert Sneppen, James H. Matthews, Darach Watson, Alex J. Cameron, Stuart A. Sim, Joris Witstok, Gabriel B. Brammer, Kasper E. Heintz, Georgios Nikopoulos

Theme match 4/5

Digest

This paper argues that Paschen and Brackett continuum structure in little red dots carries direct evidence for nebular free-bound emission rather than a simple reddened blackbody. The main result is that the observed slope changes near the Paschen jump are reproduced by recombination-dominated models and lead to concrete constraints on temperature and extinction. The paper matters because it reframes the continuum of LRDs as a diagnostic of dense ionized gas, not just of dust reddening or continuum shape.

Open paper page arXiv abstract arXiv PDF Highlighted PDF

Key figures to inspect

Figure 1 is the must-see observational figure: it shows that the Paschen and Brackett continua in the PRISM LRD sample have different slopes, which is the key evidence against a simple reddened blackbody continuum.
Figure 2 is the paper's Rosetta-stone comparison between the Sirocco model and the best observed example, making clear how the Paschen-jump region is blended with recombination emission.
Figure 3 broadens the argument beyond the flagship object by showing a little blue dot with separated Balmer, Paschen, and Brackett continuum slopes and the same basic phenomenology.
Figure 4 turns the continuum-shape argument into physical constraints, showing what electron temperature and dust reddening are allowed if the Paschen and Brackett continua are free-bound emission.

The Way We Tally Becomes the Tale: the Impact of Selection Strategies on the Inferred Evolution of Little Red Dots Across Cosmic Time

Pierluigi Rinaldi, Kevin Hainline, Francesco D'Eugenio, Pablo G. Pérez-González, Daniel J. Eisenstein, Christopher N. A. Willmer, Courtney Carreira, Brant Robertson, Benjamin D. Johnson, Stacey Alberts, William M. Baker, Andrew J. Bunker, Stefano Carniani, Eiichi Egami, Jakob M. Helton, Zhiyuan Ji, Ignas Juodžbalis, Xiaojing Lin, Jianwei Lyu, Zheng Ma, Roberto Maiolino, Eleonora Parlanti, Jan Scholtz, Yang Sun, Sandro Tacchella, Giacomo Venturi, Christina C. Williams, Chris Willott, Joris Witstok, Zihao Wu

Theme match 4/5

Digest

This paper asks how much our current picture of little red dots depends on the exact photometric selection strategy used to define the sample. The main result is that classic extreme-redness cuts recover only a minority of the broader compact LRD population, and that inferred luminosity functions and number-density evolution change substantially once a wider but still robust selection is used. The paper matters because it argues that part of the current LRD story is being written by selection bias rather than only by astrophysics, which is crucial for interpreting demographic trends and the connection to early black-hole growth.

Open paper page arXiv abstract arXiv PDF Highlighted PDF

Key figures to inspect

No figure recommendations stored yet.

Week 15, 2026

The Cliff: A Metal-Poor Little Red Dot Hosting an Overmassive Black Hole at $z = 3.55$

Digest

Key figures to inspect

Tags

GLIMPSED: Direct evidence for a fast AGN-driven outflow from a z=6.64 Little Red Dot host galaxy

Digest

Key figures to inspect

Tags

Paschen Jumps in Little Red Dots: Evidence for Nebular Continua

Digest

Key figures to inspect

Tags

The Way We Tally Becomes the Tale: the Impact of Selection Strategies on the Inferred Evolution of Little Red Dots Across Cosmic Time

Digest

Key figures to inspect

Tags