Search Publications
A surprising abundance of massive quiescent galaxies at 3 < z < 5 in the first data from JWST CEERS
Cullen, F.; McLure, R. J.; Dunlop, J. S. +9 more
We report a robust sample of 10 massive quiescent galaxies at redshift, z > 3, selected using the first data from the JWST Cosmic Evolution Early Release Science programme. Three of these galaxies are at 4 < z < 5, constituting the best evidence to date for quiescent galaxies significantly before z = 4. These extreme galaxies have stellar…
JWST NIRCam + NIRSpec: interstellar medium and stellar populations of young galaxies with rising star formation and evolving gas reservoirs
Carniani, Stefano; Übler, Hannah; D'Eugenio, Francesco +37 more
We present an interstellar medium and stellar population analysis of three spectroscopically confirmed z > 7 galaxies in the Early Release Observations JWST/NIRCam and JWST/NIRSpec data of the SMACS J0723.3-7327 cluster. We use the Bayesian spectral energy distribution-fitting code PROSPECTOR with a flexible star formation history (SFH), a vari…
UV luminosity density results at z > 8 from the first JWST/NIRCam fields: limitations of early data sets and the need for spectroscopy
Stefanon, Mauro; Oesch, Pascal; Bouwens, Rychard +4 more
We have derived luminosity functions and set constraints on the UV luminosity and SFR density from z ~ 17 to z ~ 8, using the three most-studied JWST/NIRCam data sets, the SMACS0723, GLASS Parallel, and CEERS fields. We first used our own selections on two independent reductions of these data sets using the latest calibrations. A total of 18 z ~ 8…
A red giant orbiting a black hole
Conroy, Charlie; Bieryla, Allyson; Latham, David W. +18 more
We report spectroscopic and photometric follow-up of a dormant black hole (BH) candidate from Gaia DR3. The system, which we call Gaia BH2, contains a ~1 M⊙ red giant and a dark companion with mass $M_2 = 8.9\pm 0.3\, {\rm M}_{\odot }$ that is very likely a BH. The orbital period, Porb = 1277 d, is much longer than that of an…
The chemical characterization of halo substructure in the Milky Way based on APOGEE
Bizyaev, Dmitry; Cunha, Katia; Smith, Verne V. +21 more
Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalized dwarf galaxies. The chemodynamical information recorded in their stellar populations helps elucidate their nature, constraining the assembly history of the Galaxy. Using data from APOGEE and Gaia, we examine the chemical properties of vari…
Unveiling the nature of infrared bright, optically dark galaxies with early JWST data
Brammer, G.; Oesch, P. A.; van Dokkum, P. +18 more
Over the last few years, both Atacama Large Millimeter/submillimeter Array (ALMA) and Spitzer observations have revealed a population of likely massive galaxies at z > 3 that was too faint to be detected inHubble Space Telescope(HST) rest-frame ultraviolet imaging. However, due to the very limited photometry for individual galaxies, the true na…
The impact of UV variability on the abundance of bright galaxies at z ≥ 9
Vogelsberger, Mark; Tacchella, Sandro; Boylan-Kolchin, Michael +2 more
JWST observations have revealed a population of galaxies bright enough that potentially challenge standard galaxy formation models in the Λ cold dark matter (ΛCDM) cosmology. Using a minimal empirical framework, we investigate the influence of variability on the rest-frame ultra-violet (UV) luminosity function of galaxies at z ≥ 9. Our study diffe…
The MillenniumTNG project: the galaxy population at z ≥ 8
Springel, Volker; Hernquist, Lars; Pakmor, Rüdiger +11 more
The early release science results from JWST have yielded an unexpected abundance of high-redshift luminous galaxies that seems to be in tension with current theories of galaxy formation. However, it is currently difficult to draw definitive conclusions form these results as the sources have not yet been spectroscopically confirmed. It is in any ca…
Nitrogen enhancements 440 Myr after the big bang: supersolar N/O, a tidal disruption event, or a dense stellar cluster in GN-z11?
Cameron, Alex J.; Saxena, Aayush; Katz, Harley +1 more
Recent observations of GN-z11 with JWST/NIRSpec revealed numerous oxygen, carbon, nitrogen, and helium emission lines at z = 10.6. Using the measured line fluxes, we derive abundance ratios of individual elements within the interstellar medium (ISM) of this superluminous galaxy. Driven by the unusually-bright N III] λ1750 and N IV] λ1486 emission …
Star formation histories of UV-luminous galaxies at z ≃ 6.8: implications for stellar mass assembly at early cosmic times
Charlot, Stéphane; Chevallard, Jacopo; Stark, Daniel P. +3 more
The variety of star formation histories (SFHs) of z ≳ 6 galaxies provides important insights into early star formation, but has been difficult to systematically quantify. Some observations suggest that many z ~ 6-9 galaxies are dominated by ≳200 Myr stellar populations, implying significant star formation at z ≳ 9, while others find that most reio…