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Near-infrared characterization of ultra-diffuse galaxies in Abell 2744 by JWST/NIRISS imaging
Ryota Ikeda, Takahiro Morishita, Takafumi Tsukui +10
We present a search and characterization of ultra-diffuse galaxies (UDGs) in the Frontier Fields cluster Abell~2744 at . We use JWST/NIRISS F200W observations, acquired as…
Early Results from GLASS-JWST. XIX: A High Density of Bright Galaxies at in the Abell 2744 Region
Marco Castellano, Adriano Fontana, Tommaso Treu +38
We report the detection of a high density of redshift galaxies behind the foreground cluster Abell 2744, selected from imaging data obtained recently with NIRCam onbo…
Early results from GLASS-JWST. XIV: A spectroscopically confirmed protocluster 650 million years after the Big Bang
Takahiro Morishita, Guido Roberts-Borsani, Tommaso Treu +39
We present the spectroscopic confirmation of a protocluster at behind the galaxy cluster Abell2744 (hereafter A2744-z7p9OD). Using JWST NIRSpec, we find seven galaxies wit…
Kindling the First Stars: I. Dependence of Detectability of the First Stars with JWST on the Pop III Stellar Masses
Mia Sauda Bovill, Massimo Stiavelli, Alessa Ibrahim Wiggins +2
The first Pop III stars formed out of primordial, metal free gas, in minihalos at z>20, and kickstarted the cosmic processes of reionizaton and enrichment. While these stars are li…
The nature of an ultra-faint galaxy in the cosmic Dark Ages seen with JWST
Guido Roberts-Borsani, Tommaso Treu, Wenlei Chen +44
In the first billion years after the Big Bang, sources of ultraviolet (UV) photons are believed to have ionized intergalactic hydrogen, rendering the Universe transparent to UV rad…
JWST reveals a possible galaxy merger in triply-lensed MACS0647JD
Tiger Yu-Yang Hsiao, Dan Coe, Abdurro'uf +63
MACS0647JD is a triply-lensed galaxy originally discovered with the Hubble Space Telescope. Here we report new JWST imaging, which clearly resolves MACS0647JD as ha…
High-Redshift Galaxy Candidates at as Revealed by JWST Observations of WHL0137-08
Larry D. Bradley, Dan Coe, Gabriel Brammer +25
We report the discovery of four galaxy candidates observed 450 - 600 Myr after the Big Bang with photometric redshifts between z ~ 8.3 - 10.2 measured using the JWST NIRCam imaging…
A Highly Magnified Star at Redshift 6.2
Brian Welch, Dan Coe, Jose M. Diego +26
Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or…
Deep ALMA redshift search of a z~12 GLASS-JWST galaxy candidate
Tom J. L. C. Bakx, Jorge A. Zavala, Ikki Mitsuhashi +20
The James Webb Space Telescope (JWST) has discovered a surprising abundance of bright galaxy candidates in the very early Universe ( Myrs after the Big Bang), calling into q…
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift
Brian Welch, Dan Coe, Erik Zackrisson +60
The gravitationally lensed star WHL0137-LS, nicknamed Earendel, was identified with a photometric redshift based on images taken with the Hubble Space Tele…
Early results from GLASS-JWST XIV: A first morphological atlas of the 1 < z < 5 Universe in the rest-frame optical
Colin Jacobs, Karl Glazebrook, Antonello Calabrò +20
We present a rest-frame optical morphological analysis of galaxies observed with the NIRCam imager on the James Webb Space Telescope (JWST) as part of the GLASS-JWST Early Release…
Early results from GLASS-JWST XV: properties of the faintest red sources in the NIRCAM deep fields
Karl Glazebrook, T. Nanayakkara, C. Jacobs +20
We present a first look at the reddest 2-5 sources found in deep images from the GLASS Early Release Science program. We undertake a general search, i.e. not looking for an…
Early results from GLASS-JWST. VII: evidence for lensed, gravitationally bound proto-globular clusters at z=4 in the Hubble Frontier Field A2744
E. Vanzella, M. Castellano, P. Bergamini +29
We investigate the blue and optical rest-frame sizes (lambda~2300A-4000A) of three compact star-forming regions in a galaxy at z=4 strongly lensed (x30, x45, x100) by the Hubble Fr…
Early results from GLASS-JWST. VI: Extreme rest-optical equivalent widths detected in NIRISS Wide Field Slitless Spectroscopy
K. Boyett, S. Mascia, L. Pentericci +27
Wide Field Slitless Spectroscopy (WFSS) provides a powerful tool for detecting strong line emission in star forming galaxies (SFGs) without the need for target pre-selection. As pa…
Unresolved z~8 point sources and their impact on the bright end of the galaxy luminosity function
Yuzo Ishikawa, Takahiro Morishita, Massimo Stiavelli +7
The distribution and properties of the first galaxies and quasars are critical pieces of the puzzle in understanding galaxy evolution and cosmic reionization. Previous studies have…
The GLASS James Webb Space Telescope Early Release Science Program. I. Survey Design and Release Plans
T. Treu, G. Roberts-Borsani, M. Bradac +43
The GLASS James Webb Space Telescope Early Release Science (hereafter GLASS-JWST-ERS) Program will obtain and make publicly available the deepest extragalactic data of the ERS camp…
The brightest galaxies at Cosmic Dawn
Charlotte A. Mason, Michele Trenti, Tommaso Treu
Recent JWST observations suggest an excess of galaxy candidates above most theoretical models. Here, we explore how the interplay between halo formation timescales, st…
Early results from GLASS-JWST XVI: Discovering a bluer z~4-7 Universe through UV slopes
Themiya Nanayakkara, Karl Glazebrook, Colin Jacobs +20
We use the GLASS-JWST Early Release Science NIRCam parallel observations to provide a first view of the UV continuum properties of NIRCam/F444W selected galaxies at 4<z<7. By combi…
Early results from GLASS-JWST. IV: Spatially resolved metallicity in a low-mass galaxy with NIRISS
Xin Wang, Tucker Jones, Benedetta Vulcani +19
We report the first gas-phase metallicity map of a distant galaxy measured with the James Webb Space Telescope (JWST). We use the NIRISS slitless spectroscopy acquired by the GLASS…
Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at
Lilan Yang, T. Morishita, N. Leethochawalit +23
We present the first rest-frame optical size-luminosity relation of galaxies at , using the NIRCam imaging data obtained by the GLASS James Webb Space Telescope Early Release…
Early results from GLASS-JWST. II: NIRCam extra-galactic imaging and photometric catalog
Emiliano Merlin, Andrea Bonchi, Diego Paris +26
We present the reduced images and multi-wavelength catalog of the first JWST NIRCam extra-galactic observations from the GLASS Early Release Science Program, obtained as coordinate…
Early Results from GLASS-JWST. I: Confirmation of Lensed Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS
Guido Roberts-Borsani, Takahiro Morishita, Tommaso Treu +29
We present the first search for , continuum-confirmed sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST ERS s…
Early results from GLASS-JWST. XI: Stellar masses and mass-to-light ratio of z>7 galaxies
P. Santini, A. Fontana, M. Castellano +26
We exploit James Webb Space Telescope (JWST) NIRCam observations from the GLASS-JWST-Early Release Science program to investigate galaxy stellar masses at z>7. We first show that J…
Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9
N. Leethochawalit, M. Trenti, P. Santini +23
We present the first James Webb Space Telescope/NIRCam-led determination of galaxy properties based on broadband imaging from 0.8 to 5~ as part of the GLASS-JW…