485 citations · 1.2k across the 42 of their papers we have counts for
24 papers · 1 filter
The metallicities of little red dot host galaxies: LRDs are metal poor, but not pristine
G. P. Nikopoulos, D. Watson, C. L. Pollock +4
Little Red Dots (LRDs) are a population of high-z sources discovered by JWST whose compactness, broad permitted lines, strong absorption features, continuum shapes and luminosities…
The nature of `little blue dots'
Albert Sneppen, Darach Watson, James H. Matthews +1
Previous Sirocco radiative-transfer models of gas-cocooned AGN predicted lower-column counterparts to little red dots (LRDs): compact, X-ray-weak sources with bluer continuum slope…
Quenching of X-ray emission in little red dots by both Compton-thick gas and high accretion rates
Albert Sneppen, Darach Watson, James H. Matthews +1
Little red dots (LRDs) are candidate high-redshift supermassive black holes accreting in dense gas. They remain undetected in X-rays. In previous work, we provided the first quanti…
Paschen Jumps in Little Red Dots: Evidence for Nebular Continua
Albert Sneppen, James H. Matthews, Darach Watson +6
''Little Red Dots'' (LRDs) are broad-line sources at high redshift, initially identified by their compact morphologies, red colours and prominent Balmer breaks. The origin of their…
A hot, nebular-dominated galaxy interacting with a pristine PopIII system uncovered by JWST
Henriette Reumert, Kasper E. Heintz, Clara L. Pollock +6
The discovery of galaxies with extremely strong nebular continuum emission at high redshifts provide novel, unique insights into the conditions under which the first super-massive…
Inside the cocoon: a comprehensive explanation of the spectra of Little Red Dots
A. Sneppen, D. Watson, J. H. Matthews +10
JWST has revealed a population of compact galaxies in the early Universe with broad emission lines and strong Balmer breaks; among them the so-called ''little red dots'' (LRDs). Th…
Spectroscopic characterization of a remarkable temporally varying, triple-lensed quasar at z=2.67
Charlie Lind-Thomsen, Kasper E. Heintz, Albert Sneppen +5
Gravitationally lensed quasars are viable cosmic tools for constraining a diversity of fundamental astrophysical phenomena; They enable identification of faint, low-mass supermassi…
Evidence for inefficient dust production in a massive, metal-rich galaxy at uncovered by JWST and ALMA
Kasper E. Heintz, Darach Watson, Francesco Valentino +17
Recent observations have revealed a remarkably rapid buildup of cosmic dust in the interstellar medium (ISM) of high redshift galaxies, with complex dust compositions and large abu…
Novel auroral line measurements extend the gradual offset of the FMR deep into the first Gyr of cosmic time
Clara L. Pollock, Rashmi Gottumukkala, Kasper E. Heintz +15
The mass assembly and chemical enrichment of the first galaxies provide key insights into their star-formation histories and the earliest stellar populations at cosmic dawn. Here w…
A power spectral study of PHANGS galaxies with JWST MIRI: On the spatial scales of dust and PAHs
Charlie Lind-Thomsen, Albert Sneppen, Charles L. Steinhardt
The interstellar medium (ISM) consists of a diversity of structures across a range of spatial scales, intimately tied to galactic evolution. In this work, Fourier analysis is used…
Little red dots as young supermassive black holes in dense ionized cocoons
V. Rusakov, D. Watson, G. P. Nikopoulos +14
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 do…
A massive, neutral gas reservoir permeating a galaxy proto-cluster after the reionization era
Kasper E. Heintz, Jake S. Bennett, Pascal A. Oesch +21
Galaxy clusters are the most massive, gravitationally-bound structures in the Universe, emerging through hierarchical structure formation of large-scale dark matter and baryon over…
The JWST-PRIMAL Legacy Survey. A JWST/NIRSpec reference sample for the physical properties and Lyman- absorption and emission of galaxies at
K. E. Heintz, G. B. Brammer, D. Watson +45
One of the surprising early findings with JWST has been the discovery of a strong "roll-over" or a softening of the absorption edge of Ly in a large number of galaxies at ($z\gt…
Efficient survey design for finding high-redshift galaxies with JWST
Luka Vujeva, Charles L. Steinhardt, Christian Kragh Jespersen +9
Several large JWST blank field observing programs have not yet discovered the first galaxies expected to form at . This has motivated the search for more effecti…
A Value-added COSMOS2020 Catalog of Physical Properties: Constraining Temperature-dependent Initial Mass Function
Vadim Rusakov, Charles L. Steinhardt, Albert Sneppen
This work presents and releases a catalog of new photometrically-derived physical properties for the most well-measured galaxies in the COSMOS field on the sky. Using a…
The Highest-Redshift Balmer Breaks as a Test of CDM
Charles L. Steinhardt, Albert Sneppen, Thorbjørn Clausen +3
Recent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is…
The Earliest Stage of Galactic Star Formation
Charles L. Steinhardt, Vadim Rusakov, Thomas H. Clark +5
Using a recently-developed technique to estimate gas temperatures () in star-forming regions from large photometric surveys, we propose a diagram, analogous to the H…
COSMOS2020: The Galaxy Stellar Mass Function: the assembly and star formation cessation of galaxies at
J. R. Weaver, I. Davidzon, S. Toft +30
How galaxies form, assemble, and cease their star-formation is a central question within the modern landscape of galaxy evolution studies. These processes are indelibly imprinted o…
Templates for Fitting Photometry of Ultra-High-Redshift Galaxies
Charles L. Steinhardt, Vasily Kokorev, Vadim Rusakov +2
Recent data from the James Webb Space Telescope allow a first glimpse of galaxies at . The most successful tool for identifying ultra-high-redshift candidates and inf…
Implications of a Temperature Dependent IMF III: Mass Growth and Quiescence
Charles L. Steinhardt, Albert Sneppen, Hagan Hensley +10
The stellar initial mass function (IMF) is predicted to depend upon the temperature of gas in star-forming molecular clouds. The introduction of an additional parameter, …
Implications of a Temperature Dependent IMF II: An Updated View of the Star-Forming Main Sequence
Charles L. Steinhardt, Albert Sneppen, Basel Mostafa +11
The stellar initial mass function (IMF) is predicted to depend upon the temperature of gas in star-forming molecular clouds. The introduction of an additional parameter, …
Implications of a Temperature Dependent IMF I: Photometric Template Fitting
Albert Sneppen, Charles L. Steinhardt, Hagan Hensley +3
A universal stellar initial mass function (IMF) should not be expected from theoretical models of star formation, but little conclusive observational evidence for a variable IMF ha…
COSMOS2020: A panchromatic view of the Universe to from two complementary catalogs
J. R. Weaver, O. B. Kauffmann, O. Ilbert +54
The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data has…
The BUFFALO HST Survey
Charles L. Steinhardt, Mathilde Jauzac, Ana Acebron +91
The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + 101 parallel Cycle 25 Hubble Space Telescope Treasury program taking data from 2018-2020. B…