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Gas-phase metallicity gradients in galaxies at z ∼ 6–8
Maiolino, R.; Castellano, M.; Pentericci, L. +18 more
The study of gas-phase metallicity and its spatial distribution at high redshift is crucial to understand the processes that shaped the growth and evolution of galaxies in the early Universe. Here we study the spatially resolved metallicity in three systems at z ∼ 6 ‑ 8, namely A2744-YD4, BDF-3299, and COSMOS24108, with JWST NIRSpec IFU low-resolu…
JADES: The emergence and evolution of Lyα emission and constraints on the intergalactic medium neutral fraction
Chevallard, Jacopo; Maseda, Michael V.; Parlanti, Eleonora +32 more
The rest-frame UV recombination emission line Lyα can be powered by ionising photons from young massive stars in star-forming galaxies, but the fact that it can be resonantly scattered by neutral gas complicates its interpretation. For reionisation-era galaxies, a neutral intergalactic medium will scatter Lyα from the line of sight, making Lyα a u…
The SARAO MeerKAT 1.3 GHz Galactic Plane Survey
Umana, G.; Heywood, I.; Camilo, F. +127 more
We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane (251° ≤l ≤ 358° and 2° ≤l ≤ 61° at |b| ≤ $1{_{.}^{\circ}}5$). SMGPS is the largest, most sensitive, and highest angular resolution 1 GHz survey of the plane yet carried out, with an angular resolution of 8 arcsec and a broad-…
Medium Bands, Mega Science: A JWST/NIRCam Medium-band Imaging Survey of A2744
Maseda, Michael V.; Franx, Marijn; Muzzin, Adam +40 more
In this paper, we describe the "Medium Bands, Mega Science" JWST Cycle 2 survey (JWST-GO-4111) and demonstrate the power of these data to reveal both the spatially integrated and spatially resolved properties of galaxies from the local Universe to the era of cosmic dawn. Executed in 2023 November, MegaScience obtained ∼30 arcmin2 of dee…
Quasi-periodic X-ray eruptions years after a nearby tidal disruption event
Berger, E.; Angus, C. R.; Dhillon, V. S. +61 more
Quasi-periodic eruptions (QPEs) are luminous bursts of soft X-rays from the nuclei of galaxies, repeating on timescales of hours to weeks1–5. The mechanism behind these rare systems is uncertain, but most theories involve accretion disks around supermassive black holes (SMBHs) undergoing instabilities6–8 or interacting with a…
The Discovery of the Faintest Known Milky Way Satellite Using UNIONS
Smith, Simon E. T.; Cerny, William; Hayes, Christian R. +14 more
We present the discovery of Ursa Major III/UNIONS 1, the least luminous known satellite of the Milky Way, which is estimated to have an absolute V-band magnitude of $+{2.2}_{-0.3}^{+0.4}$ mag, equivalent to a total stellar mass of ${16}_{-5}^{+6}$ M ⊙. Ursa Major III/UNIONS 1 was uncovered in the deep, wide-field Ultraviolet Near Infrar…
EIGER. VI. The Correlation Function, Host Halo Mass, and Duty Cycle of Luminous Quasars at z ≳ 6
Hennawi, Joseph F.; Simcoe, Robert A.; Naidu, Rohan P. +13 more
We expect luminous (M 1450 ≲ ‑26.5) high-redshift quasars to trace the highest-density peaks in the early Universe. Here, we present observations of four z ≳ 6 quasar fields using JWST/NIRCam in the imaging and wide-field slitless spectroscopy mode and report a wide range in the number of detected [O III]-emitting galaxies in the quasar…
Widespread Rapid Quenching at Cosmic Noon Revealed by JWST Deep Spectroscopy
Conroy, Charlie; Johnson, Benjamin D.; Belli, Sirio +16 more
Massive quiescent galaxies in the young Universe are expected to be quenched rapidly, but it is unclear whether they all experience starbursts before quenching and what physical mechanism drives rapid quenching. We study 14 massive quiescent galaxies (
JADES - the Rosetta stone of JWST-discovered AGN: deciphering the intriguing nature of early AGN
Pérez-González, Pablo G.; Charlot, Stéphane; Parlanti, Eleonora +23 more
JWST has discovered a large population of active galactic nuclei (AGN) at high redshift, which are weak in the X-rays. Here we present the NIRSpec spectrum of the most extreme of these objects, GN-28074, an AGN at
Characterization of JWST NIRCam PSFs and Implications for AGN+host Image Decomposition
Shen, Yue; Zhuang, Ming-Yang
We present a detailed analysis of the point-spread function (PSF) of JWST NIRCam imaging in eight filters: F070W, F115W, F150W, F200W, F277W, F356W, F444W, and F480M, using publicly available data. Spatial variations in the PSF FWHM generally decrease with wavelength: the maximum and rms fractional variations are ∼20% and 5% in F070W, reduced to ∼…