Publications (63)
CANUCS/Technicolor Data Release 1: Imaging, Photometry, Slit Spectroscopy, and Stellar Population Parameters
Ghassan T. E. Sarrouh, Yoshihisa Asada, Nicholas S. Martis +44
We present the first data release of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS), a JWST Cycle 1 GTO program targeting 5 lensing clusters and flanking fields in parallel (…
Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions
Anishya Harshan, Roberta Tripodi, Nicholas S. Martis +15
We present galaxy MACS0416-Y1 at z as observed by the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). MACS0416-Y1 has been shown to have extreme dust proper…
A First Look at Spatially Resolved Balmer Decrements at from JWST NIRISS Slitless Spectroscopy
Jasleen Matharu, Adam Muzzin, Ghassan Sarrouh +14
We present the first results on the spatial distribution of dust attenuation at traced by the Balmer Decrement, H/H, in emission-line galaxies using deep JWST N…
The Extended [CII] under Construction? Observation of the brightest high-z lensed star-forming galaxy at z = 6.2
Yoshinobu Fudamoto, Akio K. Inoue, Dan Coe +26
We present results of [CII] emission line observations, and report the spectroscopic redshift confirmation of a strongly lensed () star-forming galaxy, M…
The Firefly Sparkle: The Earliest Stages of the Assembly of A Milky Way-type Galaxy in a 600 Myr Old Universe
Lamiya Mowla, Kartheik Iyer, Yoshihisa Asada +19
The most distant galaxies detected by JWST are assembling in a Universe that is less than 5\% of its present age. At these times, the progenitors of galaxies like the Milky Way are…
The first large catalogue of spectroscopic redshifts in Webb's First Deep Field, SMACS J0723.37327
Gaël Noirot, Guillaume Desprez, Yoshihisa Asada +20
We present a spectroscopic redshift catalogue of the SMACS J0723.37327 field ("Webb's First Deep Field") obtained from JWST/NIRISS grism spectroscopy and supplemented with JWST/…
The production of ionizing photons in UV-faint z~3-7 galaxies
Gonzalo Prieto-Lyon, Victoria Strait, Charlotte A. Mason +20
The demographics of the production and escape of ionizing photons from UV-faint early galaxies is a key unknown in discovering the primary drivers of reionization. With the advent…
RELICS: Spectroscopy of gravitationally-lensed reionization-era analogs and implications for CIII] detections at
Ramesh Mainali, Daniel P Stark, Mengtao Tang +17
Recent observations have revealed the presence of strong CIII] emission (EW Ã ) in galaxies, the origin of which remains unclear. In an effort to understand…
The archival discovery of a strong Lyman- and [CII] emitter at z = 7.677
Francesco Valentino, Gabriel Brammer, Seiji Fujimoto +8
We report the archival discovery of Lyman- emission from the bright ultraviolet galaxy Y002 at , spectroscopically confirmed by its ionized carbon [CII] 158m emiss…
Exploring Gravitationally-Lensed X-ray AGN Behind the RELICS clusters
Akos Bogdan, Orsolya E. Kovacs, Christine Jones +5
Although observations of high-redshift quasars demonstrate that many supermassive black holes (BHs) reached large masses within one billion years after the Big Bang, the origin of…
Mass and Light of Abell 370: A Strong and Weak Lensing Analysis
Victoria Strait, Marusa Bradac, Austin Hoag +13
We present a new gravitational lens model of the Hubble Frontier Fields cluster Abell 370 () using imaging and spectroscopy from Hubble Space Telescope and ground-based…
Studying [CII] Emission in Low-mass Galaxies at z ~ 7
Kelsey Glazer, Marusa Bradac, Ryan L. Sanders +8
We report on a search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed {\lya} emitting galaxies at . Ou…
Spectroscopically Confirmed Lyman-Alpha Emitters from Redshift 5 to 7 Behind Ten Galaxy Cluster Lenses
Spencer Fuller, Brian Lemaux, MaruÅ¡a BradaÄ +10
We present 36 spectroscopically confirmed intrinsically UV-faint Ly emitting galaxies from follow-up observations with Keck/DEIMOS of gravitationally lensed high-redshift candi…
Early results from GLASS-JWST. XXVII. The mass-metallicity relation in lensed field galaxies at cosmic noon with NIRISS
Xianlong He, Xin Wang, Tucker Jones +20
We present a measurement of the mass-metallicity relation (MZR) at cosmic noon, using the JWST near-infrared wide-field slitless spectroscopy obtained by the GLASS-JWST Early Relea…
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…
Exposing Line Emission: A First Look At The Systematic Differences of Measuring Stellar Masses With JWST NIRCam Medium Versus Wide Band Photometry
Ghassan T. Sarrouh, Adam Muzzin, Kartheik G. Iyer +13
Photometrically derived stellar masses are known to suffer from systematic uncertainties, particularly due to nebular emission contributions to the spectral energy distribution. Us…
CANUCS/Technicolor: JWST Medium Band Photometry Finds Half of the Star Formation at is Obscured
Nicholas Martis, Sunna Withers, Giordano Felicioni +19
We present a sample of 146 high-redshift () galaxies from the CANUCS/Technicolor surveys, showcasing photometry in every wide- and medium-band NIRCam filter in addition to a…
RELICS: Properties of z>5.5 Galaxies Inferred from Spitzer and Hubble Imaging Including A Candidate z~6.8 Strong [OIII] Emitter
Victoria Strait, Marusa Bradac, Dan Coe +26
We present constraints on the physical properties (including stellar mass, age, and star formation rate) of 207 galaxy candidates from the Reionization Lens…
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. 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…
Early results from GLASS-JWST. IX: First spectroscopic confirmation of low-mass quiescent galaxies at with NIRISS
Danilo Marchesini, Gabriel Brammer, Takahiro Morishita +20
How passive galaxies form, and the physical mechanisms which prevent star formation over long timescales, are some of the most outstanding questions in understanding galaxy evoluti…
RELICS: High-Resolution Constraints on the Inner Mass Distribution of the z=0.83 Merging Cluster RXJ0152.7-1357 from strong lensing
Ana Acebron, May Alon, Adi Zitrin +37
Strong gravitational lensing (SL) is a powerful means to map the distribution of dark matter. In this work, we perform a SL analysis of the prominent X-ray cluster RXJ0152.7-1357 (…
RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z ~ 7
Debora Pelliccia, Victoria Strait, Brian C. Lemaux +12
We report the discovery of a spectroscopically-confirmed strong Lyman- emitter at , observed as part of the Reionization Cluster Lensing Survey (RELICS). Thi…
Two Remarkably Luminous Galaxy Candidates at Revealed by JWST
Rohan P. Naidu, Pascal A. Oesch, Pieter van Dokkum +22
The first few hundred Myrs at mark the last major uncharted epoch in the history of the Universe, where only a single galaxy (GNz11 at ) is currently spectroscop…
Bursty star formation and galaxy-galaxy interactions in low-mass galaxies 1 Gyr after the Big Bang
Yoshihisa Asada, Marcin Sawicki, Roberto Abraham +14
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_\star\sim10^8\ M…
A Steep Decline in the Galaxy Space Density Beyond Redshift 9 in the CANUCS UV Luminosity Function
Chris J. Willott, Guillaume Desprez, Yoshihisa Asada +15
We present a new sample of 158 galaxies at redshift selected from deep \jwst\ NIRCam imaging of five widely-separated sightlines in the CANUCS survey. Two-thirds of the poi…
Stellar Properties of z ~ 8 Galaxies in the Reionization Lensing Cluster Survey
Victoria Strait, Marusa Bradac, Dan Coe +18
Measurements of stellar properties of galaxies when the universe was less than one billion years old yield some of the only observational constraints of the onset of star formation…
COSMOS2020: Exploring the dawn of quenching for massive galaxies at 3 < z < 5 with a new colour selection method
Katriona M. L. Gould, Gabriel Brammer, Francesco Valentino +15
We select and characterise a sample of massive (log(MM) quiescent galaxies (QGs) at in the latest COSMOS2020 catalogue. QGs are selected using a new…
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…
Ly Emission Strength and Stellar Properties of Faint Galaxies from
Patricia Bolan, Marusa Bradac, Brian C. Lemaux +6
We present a study on stellar properties of Lyman-alpha (Ly) emitters at 5 8.2. We use 247 photometrically-selected, lensed, high-redshift, low luminosity galaxy candid…
Spectroscopy from Photometry: A Population of Extreme Emission Line Galaxies at Selected with JWST Medium Band Filters
Sunna Withers, Adam Muzzin, Swara Ravindranath +13
We use JWST/NIRCam medium band photometry in a single pointing of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS) to identify 118 Extreme Emission Line Galaxies (EELGs) over $…
CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7
Anishya Harshan, MaruÅ¡a BradaÄ, Roberto Abraham +14
The epoch of reionisation progressed through the emission of ionising photons from galaxies to their local intergalactic medium. In this work, we characterise the dwarf star-formin…
RELICS: Reionization Lensing Cluster Survey
Dan Coe, Brett Salmon, Marusa Bradac +54
Large surveys of galaxy clusters with the Hubble and Spitzer Space Telescopes, including CLASH and the Frontier Fields, have demonstrated the power of strong gravitational lensing…
CANUCS: Constraining the MACS J0416.1-2403 Strong Lensing Model with JWST NIRISS, NIRSpec and NIRCam
Gregor RihtarÅ¡iÄ, MaruÅ¡a BradaÄ, Guillaume Desprez +18
(Abridged) The strong lensing models of galaxy clusters rely on the number and quality of multiple images with spectroscopic redshifts. We present an updated strong lensing model o…
When, Where, and How Star Formation Happens in a Galaxy Pair at Cosmic Noon Using CANUCS JWST/NIRISS Grism Spectroscopy
Vicente Estrada-Carpenter, Marcin Sawicki, Gabe Brammer +13
Spatially resolved studies are key to understanding when, where, and how stars form within galaxies. Using slitless grism spectra and broadband imaging from the CAnadian NIRISS Unb…
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…
Constraining the neutral fraction of hydrogen in the IGM at redshift 7.5
Austin Hoag, MaruÅ¡a BradaÄ, Kuang-Han Huang +8
We present a large spectroscopic campaign with Keck/MOSFIRE targeting Lyman-alpha emission (Ly) from intrinsically faint Lyman-break Galaxies (LBGs) behind 12 efficient galaxy…
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…
RELICS: Small Lensed Galaxies Selected as Potential Lyman Continuum Leakers
Chloe Neufeld, Victoria Strait, MaruÅ¡a BradaÄ +8
We present size measurements of 78 high-redshift () galaxy candidates from the Reionisation Lensing Cluster Survey (RELICS). These distant galaxies are well-resolved due…
CDM not dead yet: massive high-z Balmer break galaxies are less common than previously reported
Guillaume Desprez, Nicholas S. Martis, Yoshihisa Asada +15
Early JWST observations that targeted so-called double-break sources (attributed to Lyman and Balmer breaks at ), reported a previously unknown population of very massive, evo…
Early results from GLASS-JWST VIII: An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the Abell 2744 Cluster Field
Wenlei Chen, Patrick L. Kelly, Tommaso Treu +18
We report the discovery of an extremely magnified star at redshift in James Webb Space Telescope (JWST) NIRISS pre-imaging of the Abell 2744 galaxy-cluster field. The star…
Lyman-alpha emission at the end of reionization: line strengths and profiles from MMT and JWST observations at z~5-6
Gonzalo Prieto-Lyon, Charlotte A. Mason, Victoria Strait +8
With JWST, it is now possible to use Lyman-Alpha (Ly) emission from galaxies beyond z>8 to trace neutral hydrogen in the intergalactic medium (IGM) as the Universe became reion…
Star Formation at the Epoch of Reionization with CANUCS: The ages of stellar populations in MACS1149-JD1
MaruÅ¡a BradaÄ, Victoria Strait, Lamiya Mowla +15
We present measurements of stellar populations properties of a z = 9.1 gravitationally lensed galaxy MACS1149-JD1 using deep JWST NIRISS slitless spectroscopy as well as NIRISS and…
RELICS: Strong Lensing Analysis of MACS J0417.5-1154 and Predictions for Observing the Magnified High-Redshift Universe with JWST
Guillaume Mahler, Keren Sharon, Carter Fox +37
Strong gravitational lensing by clusters of galaxies probes the mass distribution at the core of each cluster and magnifies the universe behind it. MACS J0417.5-1154 at z=0.443 is…
RELICS: Strong-lensing analysis of the massive clusters MACS J0308.9+2645 and PLCK G171.9-40.7
Ana Acebron, Nathália Cibirka, Adi Zitrin +37
Strong gravitational lensing by galaxy clusters has become a powerful tool for probing the high-redshift Universe, magnifying distant and faint background galaxies. Reliable strong…
An extremely compact, low-mass post-starburst galaxy at
Victoria Strait, Gabriel Brammer, Adam Muzzin +15
We report the discovery of a low-mass galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5PSB, is multiply imaged with magnificat…
A double-peaked Lyman- emitter with a strong blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
Lukas J. Furtak, Adèle Plat, Adi Zitrin +10
We report the discovery of a double-peaked Lyman- (Ly) emitter (LAE) at in VLT/MUSE data. The galaxy is strongly lensed by the galaxy cluster RXC~J0018.…
Hubble Frontier Field Photometric Catalogues of Abell 370 and RXC J2248.7-4431: Multiwavelength photometry, photometric redshifts, and stellar properties
Marusa Bradac, Kuang-Han Huang, Marco Castellano +15
This paper presents multiwavelength photometric catalogues of the last two Hubble Frontier Fields (HFF), the massive galaxy clusters Abell 370 and RXC J2248.7-4431. The photometry…
RUBIES: JWST/NIRSpec resolves evolutionary phases of dusty star-forming galaxies at
Olivia R. Cooper, Gabriel Brammer, Kasper E. Heintz +24
The dearth of high quality spectroscopy of dusty star-forming galaxies (DSFGs) -- the main drivers of the assembly of dust and stellar mass at the peak of activity in the Universe…
CANUCS: An Updated Mass and Magnification Model of Abell 370 with JWST
Rachel Gledhill, Victoria Strait, Guillaume Desprez +9
We report an updated mass and magnification model of galaxy cluster Abell 370 using new NIRCam and NIRISS data from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using Lens…
A Candidate Galaxy Strongly Lensed into a Spatially Resolved Arc
Brett Salmon, Dan Coe, Larry Bradley +27
The most distant galaxies known are at z~10-11, observed 400-500 Myr after the Big Bang. The few z~10-11 candidates discovered to date have been exceptionally small- barely resolve…
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…
RELICS: A Very Large () Cluster Lens -- RXC J0032.1+1808
Ana Acebron, Adi Zitrin, Dan Coe +38
Extensive surveys with the \textit{Hubble Space Telescope} (HST) over the past decade, targeting some of the most massive clusters in the sky, have uncovered dozens of galaxy-clust…
RELICS: Strong Lensing analysis of the galaxy clusters Abell S295, Abell 697, MACS J0025.4-1222, and MACS J0159.8-0849
Nathália Cibirka, Ana Acebron, Adi Zitrin +37
We present a strong-lensing analysis of four massive galaxy clusters imaged with the Hubble Space Telescope in the Reionization Lensing Cluster Survey. We use a Light-Traces-Mass t…
The Sparkler: Evolved High-Redshift Globular Clusters Captured by JWST
Lamiya A. Mowla, Kartheik G. Iyer, Guillaume Desprez +17
Using data from JWST, we analyze the compact sources ("sparkles") located around a remarkable galaxy (the "Sparkler") that is strongly gravitationally lensed b…
JWST catches the assembly of a ultra-low-mass galaxy
Yoshihisa Asada, Marcin Sawicki, Guillaume Desprez +14
Using CANUCS imaging we found an apparent major merger of two ultra-low-mass galaxies ( each) that are doubly imaged and magnified 12-15$\t…
Inferring the IGM Neutral Fraction at z ~ 6-8 with Low-Luminosity Lyman Break Galaxies
Patricia Bolan, Brian C. Lemaux, Charlotte Mason +6
We present a Bayesian inference on the neutral hydrogen fraction of the intergalactic medium (IGM), , at 6-8 using the properties of Lyman break galaxies…
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…
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. XXVI. Spatially Resolved Star Formation and Balmer Decrements at from NIRISS Slitless Spectroscopy
Pengfei Ren, Xin Wang, Yuxuan Pang +10
Using JWST/NIRISS slitless spectroscopy, we present spatially resolved Balmer decrement measurements for 79 galaxies at , which are gravitationally lensed by the for…
Red, hot, and very metal poor: extreme properties of a massive accreting black hole in the first 500 Myr
Roberta Tripodi, Nicholas Martis, Vladan Markov +29
The James Webb Space Telescope (JWST) has recently discovered a new population of objects at high redshift referred to as `Little Red Dots' (LRDs). Their nature currently remains e…
An Atlas of Color-selected Quiescent Galaxies at in Public Fields
Francesco Valentino, Gabriel Brammer, Katriona M. L. Gould +24
We present the results of a systematic search for candidate quiescent galaxies in the distant Universe in eleven fields with publicly available observations collected during…