Dan Coe
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View article: Globular Clusters in the Galaxy Cluster MACS0416 at <i>z</i> = 0.397
Globular Clusters in the Galaxy Cluster MACS0416 at <i>z</i> = 0.397 Open
We present a photometric analysis of globular clusters (GCs) in the massive galaxy cluster MACS J0416.1−2403 ( z = 0.397) using deep JWST/NIRCam imaging from the PEARLS program. Point-spread function photometry was performed in the short w…
View article: Cosmic stillness: high quiescent galaxy fractions across upper mass scales in the early Universe to <i>z</i> = 7 with <i>JWST</i>
Cosmic stillness: high quiescent galaxy fractions across upper mass scales in the early Universe to <i>z</i> = 7 with <i>JWST</i> Open
We present a detailed investigation into the abundance and morphology of high-redshift quenched galaxies at $3 < z < 7$ using James Webb Space Telescope data in the NEP, CEERS, and JADES fields. Within these fields, we identify 90 ca…
View article: First Direct Carbon Abundance Measured at <i>z</i> > 10 in the Lensed Galaxy MACS0647-JD
First Direct Carbon Abundance Measured at <i>z</i> > 10 in the Lensed Galaxy MACS0647-JD Open
Investigating the metal enrichment in the early Universe helps us constrain theories about the first stars and study the ages of galaxies. The lensed galaxy MACS0647−JD at z = 10.17 is the brightest galaxy known at z > 10. Previous work an…
View article: <i>JWST</i> s PEARLS: NIRCam imaging and NIRISS spectroscopy of a <i>z</i> = 3.6 star-forming galaxy lensed into a near-Einstein ring by a <i>z</i> = 1.258 massive elliptical galaxy
<i>JWST</i> s PEARLS: NIRCam imaging and NIRISS spectroscopy of a <i>z</i> = 3.6 star-forming galaxy lensed into a near-Einstein ring by a <i>z</i> = 1.258 massive elliptical galaxy Open
We present the discovery, and initial lensing analysis, of a high-redshift galaxy–galaxy lensing system within the JWST-PEARLS/HST–TREASUREHUNT North Ecliptic Pole Time Domain Field (designated NEPJ172238.9+655143.1). The lensing geometry …
View article: Using gravitational lensing to probe for bright quintessential galaxies in the Epoch of Reionization
Using gravitational lensing to probe for bright quintessential galaxies in the Epoch of Reionization Open
Understanding the properties of the first generation of galaxies is an ongoing challenge in observational astrophysics. While advances in deep field observation have led to the identification of large numbers of galaxies within the Epoch o…
View article: Unveiling the Cosmic Gems Arc at <i>z</i> ∼ 10 with JWST NIRCam
Unveiling the Cosmic Gems Arc at <i>z</i> ∼ 10 with JWST NIRCam Open
We present recent JWST NIRCam imaging observations of SPT0615-JD (also known as the Cosmic Gems Arc), lensed by the galaxy cluster SPT-CL J0615−5746. The 5 ″ long arc is the most highly magnified z > 10 galaxy known. It straddles the lensi…
View article: JWST’s PEARLS: A <i>z</i> ≃ 6 quasar in a train-wreck galaxy merger system
JWST’s PEARLS: A <i>z</i> ≃ 6 quasar in a train-wreck galaxy merger system Open
We present JWST NIRSpec integral field spectroscopy observations of the z = 5.89 quasar NDWFS J1425+3254 from 0.6–5.3 μm, covering the rest-frame ultraviolet and optical at a spectral resolution of R ∼ 100. The quasar has a black hole mass…
View article: Self-consistent JWST Census of Star Formation and AGN Activity at <i>z</i> = 5.5–13.5
Self-consistent JWST Census of Star Formation and AGN Activity at <i>z</i> = 5.5–13.5 Open
The cosmic star formation history (CSFH) and cosmic active galactic nuclei (AGN) luminosity history (CAGNH) are self consistently measured at z = 5.5–13.5. This is achieved by analyzing galaxies detected by the James Webb Space Telescope f…
View article: Lonely Little Red Dots: Challenges to the Active Galactic Nucleus Nature of Little Red Dots through Their Clustering and Spectral Energy Distributions
Lonely Little Red Dots: Challenges to the Active Galactic Nucleus Nature of Little Red Dots through Their Clustering and Spectral Energy Distributions Open
Observations with the James Webb Space Telescope reveal a previously unseen population of compact red objects, known as “little red dots” (LRDs). We study a new photometrically selected sample of 124 LRDs in the redshift range z ∼ 3–10 sel…
View article: The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters
The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters Open
The recent discovery of five massive stellar clusters at z=9.625 in the Cosmic Gems has raised the question about the formation mechanism of star clusters in the first half Gyr after the Big-Bang. We infer the total stellar mass in cluster…
View article: JWST spectroscopic confirmation of the Cosmic Gems arc at z=9.625 -- Insights into the small scale structure of a post-burst system
JWST spectroscopic confirmation of the Cosmic Gems arc at z=9.625 -- Insights into the small scale structure of a post-burst system Open
We present JWST/NIRSpec integral field spectroscopy of the Cosmic Gems arc, strongly magnified by the galaxy cluster SPT-CL J0615$-$5746. Six-hour integration using NIRSpec prism spectroscopy (resolution $\rm R\simeq 30-300$), covering the…
View article: Dissecting Reionisation with the Cosmic Star Formation and Active Galactic Nuclei Luminosity History
Dissecting Reionisation with the Cosmic Star Formation and Active Galactic Nuclei Luminosity History Open
The combination of the $z=0-13.5$ cosmic star formation history and active galactic nuclei (AGN) luminosity history as inferred by the James Webb Space Telescope is connected to the cosmic spectral energy distribution (CSED) to explore the…
View article: PEARLS: Twenty-One Transients Found in the Three-Epoch NIRCam Observations in the Continuous Viewing Zone of the James Webb Space Telescope
PEARLS: Twenty-One Transients Found in the Three-Epoch NIRCam Observations in the Continuous Viewing Zone of the James Webb Space Telescope Open
We present 21 infrared transients found in our three-epoch, four-band NIRCam observations covering 14.16 arcmin^2 in the Spitzer IRAC Dark Field (IDF), taken by the JWST Prime Extragalactic Areas for Reionization and Lensing Science (PEARL…
View article: SAPPHIRES: Extremely Metal-Poor Galaxy Candidates with $12+{\rm log(O/H)}<7.0$ at $z\sim5-7$ from Deep JWST/NIRCam Grism Observations
SAPPHIRES: Extremely Metal-Poor Galaxy Candidates with $12+{\rm log(O/H)}<7.0$ at $z\sim5-7$ from Deep JWST/NIRCam Grism Observations Open
Population III stars, the hypothetical first generation metal-free stars, have yet to be discovered. Even after three years of successful JWST operations, studies have shown that most galaxies identified to date at $z > 5$ exhibit a metall…
View article: Galaxy mergers in the epoch of reionization – I. A JWST study of pair fractions, merger rates, and stellar mass accretion rates at <i>z</i> = 4.5–11.5
Galaxy mergers in the epoch of reionization – I. A JWST study of pair fractions, merger rates, and stellar mass accretion rates at <i>z</i> = 4.5–11.5 Open
We present a full analysis of galaxy major merger pair fractions, merger rates, and mass accretion rates, thus uncovering the role of mergers in galaxy formation at the earliest previously unexplored epoch of $4.5< z< 11.5$. We targe…
View article: BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results
BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results Open
We introduce the Bias-free Extragalactic Analysis for Cosmic Origins with NIRCam (BEACON) survey, a JWST Cycle 2 program allocated up to 600 pure-parallel hours of observations. BEACON explores high-latitude areas of the sky with JWST/NIRC…
View article: EPOCHS. XI. The Structure and Morphology of Galaxies in the Epoch of Reionization to <i>z</i> ∼ 12.5
EPOCHS. XI. The Structure and Morphology of Galaxies in the Epoch of Reionization to <i>z</i> ∼ 12.5 Open
We present a structural analysis of 520 galaxy candidates at 6.5 < z < 12.5 with a signal-to-noise ratio of >10 σ in the F444W filter taken from the EPOCHS v1 sample, consisting of uniformly reduced deep JWST NIRCam data covering the CEERS…
View article: EPOCHS. I. The Discovery and Star-forming Properties of Galaxies in the Epoch of Reionization at 6.5 < <i>z</i> < 18 with PEARLS and Public JWST Data
EPOCHS. I. The Discovery and Star-forming Properties of Galaxies in the Epoch of Reionization at 6.5 < <i>z</i> < 18 with PEARLS and Public JWST Data Open
We present in this paper the discovery, properties, and a catalog of 1165 high-redshift 6.5 < z < 18 galaxies found in deep JWST NIRCam imaging from the GTO PEARLS survey combined with data from JWST public fields. We describe our bespoke …
View article: Self-Consistent JWST Census of Star Formation and AGN activity at z=5.5-13.5
Self-Consistent JWST Census of Star Formation and AGN activity at z=5.5-13.5 Open
The cosmic star formation history (CSFH) and cosmic active galactic nuclei (AGN) luminosity history (CAGNH) are self consistently measured at $z = 5.5-13.5$. This is achieved by analyzing galaxies detected by the James Webb Space Telescope…
View article: EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations
EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations Open
We utilize deep JWST Near Infrared Camera (NIRCam) observations for the first direct constraints on the Galaxy Stellar Mass Function (GSMF) at z > 10. Our EPOCHS v1 sample includes 1120 galaxy candidates at 6.5 < z < 13.5 taken from a cons…
View article: UNCOVER: Candidate Red Active Galactic Nuclei at 3 < z < 7 with JWST and ALMA
UNCOVER: Candidate Red Active Galactic Nuclei at 3 < z < 7 with JWST and ALMA Open
The James Webb Space Telescope (JWST) is revolutionizing our knowledge of z > 5 galaxies and their actively accreting black holes. Using the JWST Cycle 1 Treasury program Ultradeep NIRSpec and NIRCam Observations before the Epoch of Reioni…
View article: EPOCHS XI: The Structure and Morphology of Galaxies in the Epoch of Reionization to z ~ 12.5
EPOCHS XI: The Structure and Morphology of Galaxies in the Epoch of Reionization to z ~ 12.5 Open
We present a structural analysis of 521 galaxy candidates at 6.5 < z < 12.5, with $SNR > 10σ$ in the F444W filter, taken from the EPOCHS v1 sample, consisting of uniformly reduced deep JWST NIRCam data, covering the CEERS, JADES GOOD-S, NG…
View article: Cosmic Stillness: High Quiescent Galaxy Fractions Across Upper Mass Scales in the Early Universe to z = 7 with JWST
Cosmic Stillness: High Quiescent Galaxy Fractions Across Upper Mass Scales in the Early Universe to z = 7 with JWST Open
We present a detailed investigation into the abundance and morphology of high redshift quenched galaxies at $3 < z < 7$ using James Webb Space Telescope data in the NEP, CEERS and JADES fields. Within these fields, we identify 90 candidate…
View article: BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results
BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results Open
We introduce the Bias-free Extragalactic Analysis for Cosmic Origins with NIRCam (BEACON) survey, a JWST Cycle2 program allocated up to 600 pure-parallel hours of observations. BEACON explores high-latitude areas of the sky with JWST/NIRCa…
View article: UNCOVER: A NIRSpec Census of Lensed Galaxies at z = 8.50–13.08 Probing a High-AGN Fraction and Ionized Bubbles in the Shadow
UNCOVER: A NIRSpec Census of Lensed Galaxies at z = 8.50–13.08 Probing a High-AGN Fraction and Ionized Bubbles in the Shadow Open
We present JWST NIRSpec prism spectroscopy of lensed galaxies at z ≳ 9 found behind the massive galaxy cluster Abell 2744 in the UNCOVER Cycle 1 Treasury Program. We confirm the redshift via emission lines and/or the Ly α break for 10 gala…
View article: ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8
ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8 Open
We present a statistical study of 180 dust continuum sources identified in 33 massive cluster fields by the Atacama Large Millimeter/submillimeter Array Lensing Cluster Survey (ALCS) over a total of 133 arcmin 2 area, homogeneously observe…
View article: Galaxy Mergers in the Epoch of Reionization II: Major Merger-Triggered Star Formation and AGN Activities at $z =$ 4.5-8.5
Galaxy Mergers in the Epoch of Reionization II: Major Merger-Triggered Star Formation and AGN Activities at $z =$ 4.5-8.5 Open
Galaxy mergers are a key driver of galaxy formation and evolution, including the triggering of AGN and star formation to a still unknown degree. We thus investigate the impact of galaxy mergers on star formation and AGN activity using a sa…
View article: JWST View of Four Infant Galaxies at z = 8.31–8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
JWST View of Four Infant Galaxies at z = 8.31–8.49 in the MACS J0416.1−2403 Field and Implications for Reionization Open
New JWST/NIRCam wide-field slitless spectroscopy provides redshifts for four z > 8 galaxies located behind the lensing cluster MACS J0416.1−2403. Two of them, “Y1” and “JD,” have previously reported spectroscopic redshifts based on Atacama…
View article: PEARLS: Discovery of Point-source Features within Galaxies in the North Ecliptic Pole Time Domain Field
PEARLS: Discovery of Point-source Features within Galaxies in the North Ecliptic Pole Time Domain Field Open
The first public 0.9–4.4 μ m NIRCam images of the North Ecliptic Pole Time Domain Field uncovered galaxies displaying point-source features in their cores as seen in the longer-wavelength filters. We visually identified a sample of 66 gala…
View article: The JWST UNCOVER Treasury Survey: Ultradeep NIRSpec and NIRCam Observations before the Epoch of Reionization
The JWST UNCOVER Treasury Survey: Ultradeep NIRSpec and NIRCam Observations before the Epoch of Reionization Open
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 UNCOVE…