James Colbert
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View article: MAMMOTH-MOSFIRE: Environmental Effects on Galaxy Interstellar Medium at <i>z</i> ∼ 2
MAMMOTH-MOSFIRE: Environmental Effects on Galaxy Interstellar Medium at <i>z</i> ∼ 2 Open
The MAMMOTH-MOSFIRE program is a deep Keck/MOSFIRE K -band spectroscopic follow-up of emission-line galaxies identified in the MAMMOTH-Grism Hubble Space Telescope/wide-field camera 3 G141 slitless spectroscopic survey, targeting the core …
View article: Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE): Survey Overview
Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE): Survey Overview Open
During the second half of Cycle 1 of the James Webb Space Telescope (JWST), we conducted the Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE) program. PASSAGE received the largest allocation of JWST obser…
View article: The Reset Switch Charge Decay Effect in JWST/MIRI Observations
The Reset Switch Charge Decay Effect in JWST/MIRI Observations Open
Blocked impurity band arsenic-doped silicon detectors such as those used in the James Webb Space Telescope’s Mid-Infrared Instrument were invented in the 1980s to overcome many of the unwanted second-order effects found in the photoconduct…
View article: UV Spectral Slope and Nebular Dust Attenuation in Dwarf Galaxies at $1.4
UV Spectral Slope and Nebular Dust Attenuation in Dwarf Galaxies at $1.4 Open
We analyze nebular dust attenuation and its correlation with stellar mass ($M_{*}$) and UV spectral slope ($β$) in 33 lensed, low-mass star-forming galaxies at $1.4\leq z \leq 2.6$, using Keck/MOSFIRE rest-frame optical spectroscopy. Locat…
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: The Lyman Continuum Escape Fraction of Star-forming Galaxies at 2.4 ≲ <i>z</i> ≲ 3.0 from UVCANDELS
The Lyman Continuum Escape Fraction of Star-forming Galaxies at 2.4 ≲ <i>z</i> ≲ 3.0 from UVCANDELS Open
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits of primary Wide-Field Camera…
View article: Cyberinfrastructure for machine learning applications in agriculture: experiences, analysis, and vision
Cyberinfrastructure for machine learning applications in agriculture: experiences, analysis, and vision Open
Introduction Advancements in machine learning (ML) algorithms that make predictions from data without being explicitly programmed and the increased computational speeds of graphics processing units (GPUs) over the last decade have led to r…
View article: Compact Size, High $Σ$SFR: Defining Morphological Features of Ly$α$-Emitters
Compact Size, High $Σ$SFR: Defining Morphological Features of Ly$α$-Emitters Open
The mechanisms of Ly$α$ photon escape are key to understanding galaxy evolution and cosmic reionization, yet remain poorly understood. We investigate the UV-continuum sizes of 23 Ly$α$ emitters (LAEs) at Cosmic Noon ($1.7 < z < 3.3$), exte…
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: UVCANDELS: Catalogs of Photometric Redshifts and Galaxy Physical Properties
UVCANDELS: Catalogs of Photometric Redshifts and Galaxy Physical Properties Open
The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep Hubble Space Telescope (HST) F275W and F435W imaging over four CANDELS fields (GOODS-N, GOODS-S, COSMOS,…
View article: UVCANDELS: Catalogs of photometric redshifts and galaxy physical properties
UVCANDELS: Catalogs of photometric redshifts and galaxy physical properties Open
The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep HST F275W and F435W imaging over four CANDELS fields (GOODS-N, GOODS-S, COSMOS, and EGS). We combine thi…
View article: Emission-line galaxies at <i>z</i> ∼ 1 from near-IR <i>HST</i> slitless spectroscopy: metallicities, star formation rates, and redshift confirmations from VLT/FORS2 spectroscopy
Emission-line galaxies at <i>z</i> ∼ 1 from near-IR <i>HST</i> slitless spectroscopy: metallicities, star formation rates, and redshift confirmations from VLT/FORS2 spectroscopy Open
We follow up emission line galaxies identified through the near-infrared slitless HST/WFC3 WISP survey with VLT/FORS2 optical spectroscopy. Over 4 WISP fields, we targeted 85 of 138 line emission objects at $0.4\lt z\lt 2$ identified in WF…
View article: The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS
The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS Open
UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields—GOODS-N, GOODS-S, EGS, and COSMOS—covering a…
View article: Emission-line galaxies at $z\sim1$ from near-IR HST Slitless Spectroscopy: metallicities, star formation rates and redshift confirmations from VLT/FORS2 spectroscopy
Emission-line galaxies at $z\sim1$ from near-IR HST Slitless Spectroscopy: metallicities, star formation rates and redshift confirmations from VLT/FORS2 spectroscopy Open
We follow up emission line galaxies identified through the near-infrared slitless HST/WFC3 WISP survey with VLT/FORS2 optical spectroscopy. Over 4 WISP fields, we targetted 85 of 138 line emission objects at $0.4
View article: WFC3 Infrared Spectroscopic Parallel (WISP) Survey: Photometric and Emission Line Data Release
WFC3 Infrared Spectroscopic Parallel (WISP) Survey: Photometric and Emission Line Data Release Open
We present reduced images and catalogues of photometric and emission line data ($\sim$230,000 and $\sim$8,000 sources, respectively) for the WFC3 Infrared Spectroscopic Parallel (WISP) Survey. These data are made publicly available on the …
View article: WFC3 Infrared Spectroscopic Parallel (WISP) survey: photometric and emission-line data release
WFC3 Infrared Spectroscopic Parallel (WISP) survey: photometric and emission-line data release Open
We present reduced images and catalogues of photometric and emission-line data (∼230 000 and ∼8000 sources, respectively) for the WFC3 (Wide Field Camera 3) Infrared Spectroscopic Parallel (WISP) survey. These data are made publicly availa…
View article: Ultraviolet and Blue Optical Imaging of UVCANDELS
Ultraviolet and Blue Optical Imaging of UVCANDELS Open
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey provided ultraviolet F275W imaging with coordinated parallel optical F435W imaging in four of the five CANDELS fields: …
View article: The UV luminosity function at 0.6 < z < 1 from UVCANDELS
The UV luminosity function at 0.6 < z < 1 from UVCANDELS Open
UVCANDELS is a HST Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields: GOODS-N, GOODS-S, EGS, and COSMOS, covering a total area of $\…
View article: The Lyman Continuum Escape Fraction of Star-forming Galaxies at $2.4\lesssim z\lesssim3.0$ from UVCANDELS
The Lyman Continuum Escape Fraction of Star-forming Galaxies at $2.4\lesssim z\lesssim3.0$ from UVCANDELS Open
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits of primary Wide-Field Camera…
View article: A Spatially Resolved Analysis of Star Formation Burstiness by Comparing UV and Hα in Galaxies at z ∼ 1 with UVCANDELS
A Spatially Resolved Analysis of Star Formation Burstiness by Comparing UV and Hα in Galaxies at z ∼ 1 with UVCANDELS Open
The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides Hubble Space Telescope (HST)/UVIS F275W imaging for four CANDELS fields. We combine this UV imaging with exis…
View article: JWST MIRI Flight Performance: Detector Effects and Data Reduction Algorithms
JWST MIRI Flight Performance: Detector Effects and Data Reduction Algorithms Open
The detectors in the Mid-Infrared Instrument (MIRI) of the James Webb Space Telescope (JWST) are arsenic-doped silicon impurity band conduction (Si:As IBC) devices and are direct descendants of the Spitzer IRAC long wavelength arrays (chan…
View article: A spatially resolved analysis of star-formation burstiness by comparing UV and H$α$ in galaxies at z$\sim$1 with UVCANDELS
A spatially resolved analysis of star-formation burstiness by comparing UV and H$α$ in galaxies at z$\sim$1 with UVCANDELS Open
The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides HST/UVIS F275W imaging for four CANDELS fields. We combine this UV imaging with existing HST/near-IR grism sp…
View article: Erratum: “Identification of Single Spectral Lines in Large Spectroscopic Surveys Using UMLAUT: an Unsupervised Machine-learning Algorithm Based on Unbiased Topology” (2021, ApJS, 257, 67)
Erratum: “Identification of Single Spectral Lines in Large Spectroscopic Surveys Using UMLAUT: an Unsupervised Machine-learning Algorithm Based on Unbiased Topology” (2021, ApJS, 257, 67) Open
Due to an error at the publisher two symbol errors were introduced. 1. In Section 3.1, in list item 1 “Data samples that are similar in a sufficiently large amount of independent dimensions (N=) tend to be similar also when considering an …
View article: Preliminary Material
Preliminary Material Open
View article: The average dust attenuation curve at <i>z</i> ∼ 1.3 based on <i>HST</i> grism surveys
The average dust attenuation curve at <i>z</i> ∼ 1.3 based on <i>HST</i> grism surveys Open
We present the first characterization of the average dust attenuation curve at z ∼ 1.3 by combining rest-frame ultraviolet through near-IR photometry with Balmer decrement (H α/H β) constraints for ∼900 galaxies with 8 ≲ log (M⋆/M⊙) < 1…
View article: First Census of Gas-phase Metallicity Gradients of Star-forming Galaxies in Overdense Environments at Cosmic Noon
First Census of Gas-phase Metallicity Gradients of Star-forming Galaxies in Overdense Environments at Cosmic Noon Open
We report the first spatially resolved measurements of gas-phase metallicity radial gradients in star-forming galaxies in overdense environments at z ≳ 2. The spectroscopic data are acquired by the MAMMOTH-Grism survey, a Hubble Space Tele…
View article: The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope
The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope Open
The Nancy Grace Roman Space Telescope will conduct a High Latitude Spectroscopic Survey (HLSS) over a large volume at high redshift, using the near-IR grism (1.0–1.93 μ m, R = 435–865) and the 0.28 deg 2 wide-field camera. We present a ref…
View article: The Mass–Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH–Grism HST Slitless Spectroscopic Survey
The Mass–Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH–Grism HST Slitless Spectroscopic Survey Open
The MAMMOTH–Grism slitless spectroscopic survey is a Hubble Space Telescope (HST) cycle 28 medium program, which is obtaining 45 orbits of WFC3/IR grism spectroscopy in the density peak regions of three massive galaxy protoclusters at z = …
View article: Identification of Single Spectral Lines in Large Spectroscopic Surveys Using UMLAUT: an Unsupervised Machine-learning Algorithm Based on Unbiased Topology
Identification of Single Spectral Lines in Large Spectroscopic Surveys Using UMLAUT: an Unsupervised Machine-learning Algorithm Based on Unbiased Topology Open
The identification of an emission line is unambiguous when multiple spectral features are clearly visible in the same spectrum. However, in many cases, only one line is detected, making it difficult to correctly determine the redshift. We …
View article: The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope
The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope Open
The Nancy Grace Roman Space Telescope will conduct a High Latitude Spectroscopic Survey (HLSS) over a large volume at high redshift, using the near-IR grism (1.0-1.93 $μ$m, $R=435-865$) and the 0.28 deg$^2$ wide field camera. We present a …