Rachel Bezanson, Ivo Labbé, Katherine E. Whitaker, Joel Leja et al.
Abstract In this paper we describe the survey design for the Ultradeep NIRSpec and NIRCam Observations before the Epoch of Reionization (UNCOVER) Cycle 1 JWST Treasury program, which executed its early imaging component in 2022 November. The UNCOVER survey includes ultradeep (∼29–30AB) imaging of ∼4...
Josephine F. W. Baggen, Pieter van Dokkum, Gabriel Brammer, Anna de Graaff et al.
Abstract Early JWST studies found an apparent population of massive, compact galaxies at redshifts z ≳ 7. Recently three of these galaxies were shown to have prominent Balmer breaks, demonstrating that their light at λ rest ∼ 3500 Å is dominated by a stellar population that is relatively old (∼200 M...
Bingjie Wang, Anna de Graaff, R. L. Davies, Jenny E. Greene et al.
Abstract The JWST discovery of “little red dots” (LRDs) is reshaping our picture of the early Universe, yet the physical mechanisms driving their compact size and UV-optical colors remain elusive. Here, we report an unusually bright LRD ( z spec = 3.1) observed as part of the RUBIES program. This LR...
Katherine A. Suess, John R. Weaver, Sedona H. Price, Richard Pan et al.
Abstract 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 No...
Andrea Weibel, Anna de Graaff, David J. Setton, Tim B. Miller et al.
Abstract We report the spectroscopic discovery of a massive quiescent galaxy at z spec = 7.29 ± 0.01, just ∼700 Myr after the big bang. RUBIES-UDS-QG-z7 was selected from public JWST/NIRCam and MIRI imaging from the PRIMER survey and observed with JWST/NIRSpec as part of RUBIES. The NIRSpec/PRISM sp...
Yilun Ma, Jenny E. Greene, David J. Setton, Marta Volonteri et al.
Abstract JWST has revealed an abundance of compact, red objects at z ≈ 5–8 dubbed “little red dots” (LRDs), whose SEDs display a faint blue UV continuum followed by a steep rise in the optical. Despite extensive study of their characteristic V-shaped SEDs, the nature of LRDs remains unknown. We pres...
Themiya Nanayakkara, Karl Glazebrook, C. Schreiber, Harry George Chittenden et al.
Abstract We present the formation histories of 19 massive (≳3 × 10 10 M ⊙ ) quiescent (specific star formation rate, sSFR < 0.15 Gyr −1 ) galaxy candidates at z ~ 3.0–4.5 observed using JWST/NIRSpec. This completes the spectroscopic confirmation of the 24 K -selected quiescent galaxy sample from ...
Iryna Chemerynska, Hakim Atek, Pratika Dayal, Lukas J. Furtak et al.
Abstract The mass–metallicity relation provides crucial insights into the baryon cycle in galaxies and strong constraints on galaxy formation models. We use JWST NIRSpec observations from the UNCOVER program to measure the gas-phase metallicity in a sample of eight galaxies during the epoch of reion...
Vasily Kokorev, Hakim Atek, John Chisholm, Ryan Endsley et al.
Abstract We report the discovery of two galaxy candidates at redshifts between 15.7 < z < 16.4 in James Webb Space Telescope (JWST) observations from the GLIMPSE survey. These robust sources were identified using a combination of Lyman break selection and photometric redshift estimates. The ul...
Helena Treiber, Jenny E. Greene, John R. Weaver, Tim B. Miller et al.
Abstract JWST has revealed diverse new populations of high-redshift ( z ∼ 4–11) active galactic nuclei (AGNs) and extreme star-forming galaxies that challenge current photoionization models. In this paper, we use rest-frame UV emission-line diagnostics to identify AGN candidates and other exceptiona...
Mengyuan Xiao, Christina C. Williams, Pascal A. Oesch, David Elbaz et al.
We report the discovery of an ultra-massive grand-design red spiral galaxy, named Zhúlóng (Torch Dragon), at z phot = 5.2 −0.2 +0.3 in the JWST PANORAMIC survey; it is the most distant bulge+disk galaxy candidate with spiral arms known to date. Zhúlóng displays an extraordinary combination of proper...
Sedona H. Price, Katherine A. Suess, Christina C. Williams, Rachel Bezanson et al.
Abstract With the wavelength coverage, sensitivity, and high spatial resolution of JWST, it is now possible to peer through the dust attenuation to probe the rest-frame near-infrared (NIR) and stellar structures of extremely dusty galaxies at cosmic noon ( z ∼ 1−3). In this paper we leverage the com...