100 citations · 128 across the 12 of their papers we have counts for
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JWST spectroscopy of galaxies at : Damped Ly absorbers reveal efficient star formation and hidden redshift biases
Kasper E. Heintz, Clara L. Pollock, Joris Witstok +23
Recent observations with JWST have revealed a remarkable population of surprisingly luminous galaxies at redshifts . Their abundance exceed predictions from simulations and e…
Chemical signatures from the first stars embedded in metal-poor gas in galaxies at cosmic dawn
Clara L. Pollock, Kasper E. Heintz, Elka Rusta +15
The first generation of stars formed from pristine, neutral hydrogen gas. The most massive of these exploded as supernovae within a few million years of their birth, producing the…
Too many protoclusters? Reconciling the overabundance of cluster progenitors within the first billion years of the Universe
Callum Witten, Jake S. Bennett, Pascal A. Oesch +8
JWST has revealed an overabundance of apparent (`Coma'-like) cluster progenitors at that is two (300) times in excess of, and in () tension with, the number…
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…
Characterising Ly damping wings at the onset of reionisation: Evidence for highly efficient star formation driven by dense, neutral gas in UV-bright galaxies at
Clara L. Pollock, Kasper E. Heintz, Joris Witstok +23
One of the major conundrums in contemporary extragalactic astrophysics is the apparent overabundance of a remarkable population of UV-bright galaxies at redshifts . We…
All the Massive Galaxy Overdensities during Reionization: JWST Rest-Frame Optical Selection Reveals Young, Chemically Evolved Galaxies Embedded in Dense, Neutral Gas at z > 5
Chamilla Terp, Kasper E. Heintz, Jorryt Matthee +7
The high-redshift progenitors of present-day galaxy clusters are believed to substantially contribute to the global star-formation rate density and drive the large-scale reionizati…
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…
Dissecting the massive pristine, neutral gas reservoir of a remarkably bright galaxy at z = 14.179
Kasper E. Heintz, Clara Pollock, Joris Witstok +6
At cosmic dawn, the first stars and galaxies are believed to form from and be deeply embedded in clouds of dense, pristine gas. Here we present a study of the JWST/NIRSpec data of…
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…
Uncovering the physical origin of the prominent Lyman- emission and absorption in GS9422 at
Chamilla Terp, Kasper E. Heintz, Darach Watson +5
We present a comprehensive spectro-photometric analysis of the galaxy GS9422 from the JADES GTO survey located at , anomalously showing a simultaneous strong Ly emissio…
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…