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Insight from JWST/Near Infrared Camera into galaxy overdensities around bright Lyman-alpha emitters during reionization: implications for ionized bubbles at z 9
Charlot, Stéphane; Chen, Zuyi; Stark, Daniel P. +4 more
Several studies have detected Lyman-alpha (Ly Α) from bright ($M_{\small UV}\lesssim -21.5$) galaxies during the early stages of reionization despite the significantly neutral intergalactic medium. To explain these detections, it has been suggested that z > 7 Ly Α emitters (LAEs) inhabit physical Mpc (pMpc)-scale ionized regions powered by over…
Ionizing properties of galaxies in JADES for a stellar mass complete sample: resolving the cosmic ionizing photon budget crisis at the Epoch of Reionization
Maiolino, R.; Johnson, B. D.; Willott, C. +26 more
We use NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) to study the ionizing properties of a sample of 14 652 galaxies at
New insight on the nature of cosmic reionizers from the CEERS survey
Kartaltepe, J. S.; Dickinson, M.; Finkelstein, S. L. +30 more
The Epoch of Reionization (EoR) began when galaxies grew in abundance and luminosity, so their escaping Lyman continuum (LyC) radiation started ionizing the surrounding neutral intergalactic medium (IGM). Despite significant recent progress, the nature and role of cosmic reionizers are still unclear: in order to define them, it would be necessary …
A JWST investigation into the bar fraction at redshifts 1 ≤ z ≤ 3
Conselice, Christopher J.; Fragkoudi, Francesca; Ferreira, Leonardo +7 more
The presence of a stellar bar in a disc galaxy indicates that the galaxy hosts in its main part a dynamically settled disc and that bar-driven processes are taking place in shaping its evolution. Studying the cosmic evolution of the bar fraction in disc galaxies is therefore essential to understand galaxy evolution in general. Previous studies hav…
Bursty star formation and galaxy-galaxy interactions in low-mass galaxies 1 Gyr after the Big Bang
Willott, Chris J.; Harshan, Anishya; Bradač, Maruša +14 more
We use CANUCS JWST/NIRCam imaging of galaxies behind the gravitationally-lensing cluster MACS J0417.5-1154 to investigate star formation burstiness in low-mass (M⋆ ~ 108 M⊙) galaxies at z ~ 4.7-6.5. Our sample of 123 galaxies is selected using the Lyman break selection and photometric emission-line excess methods. …
JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5
Chevallard, Jacopo; Maseda, Michael V.; Carniani, Stefano +30 more
We present a spatially resolved study of stellar populations in six galaxies with stellar masses M * ∼ 1010 M ☉ at z ∼ 3.7 using 14-filter James Webb Space Telescope (JWST)/NIRCam imaging from the JADES and JEMS surveys. The six galaxies are visually selected to have clumpy substructures with distinct colors over r…
White dwarfs as a probe of exceptionally light QCD axions
Balkin, Reuven; Serra, Javi; Springmann, Konstantin +2 more
We study the effects of exceptionally light QCD axions on the stellar configuration of white dwarfs. At finite baryon density, the nonderivative coupling of the axion to nucleons displaces the axion from its in-vacuum minimum, which implies a reduction of the nucleon mass. This dramatically alters the composition of stellar remnants. In particular…
Size–Stellar Mass Relation and Morphology of Quiescent Galaxies at z ≥ 3 in Public JWST Fields
Heintz, Kasper E.; Brammer, Gabriel; Ilbert, Olivier +19 more
We present the results of a systematic study of the rest-frame optical morphology of quiescent galaxies at z ≥ 3 using the Near-Infrared Camera (NIRCam) on board the James Webb Space Telescope (JWST). Based on a sample selected by UVJ color or NUVUVJ color, we focus on 26 quiescent galaxies with $9.8\lt \mathrm{log}({M}_{\star }/{M}_{\odot })\lt 1…
A high internal heat flux and large core in a warm Neptune exoplanet
Fortney, Jonathan J.; McGill, Peter; Bell, Taylor J. +16 more
Interactions between exoplanetary atmospheres and internal properties have long been proposed to be drivers of the inflation mechanisms of gaseous planets and apparent atmospheric chemical disequilibrium conditions1. However, transmission spectra of exoplanets have been limited in their ability to observationally confirm these theories …
Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web
Finkelstein, Steven L.; Bagley, Micaela B.; Casey, Caitlin M. +48 more
We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin2. We fit the sample using several publicly available spectra…