James E. Rhoads
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View article: The Atomic Gas Properties of Green Pea Galaxies: Connections to Lyman Continuum Leakage
The Atomic Gas Properties of Green Pea Galaxies: Connections to Lyman Continuum Leakage Open
We have used the Green Bank Telescope to search for H i 21 cm emission from 30 Green Pea galaxies (GPs) at z ≈ 0.012–0.045, obtaining 7 detections of H i 21 cm emission and 17 upper limits on the H i mass. Including GPs from the literature…
View article: The atomic gas properties of Green Pea galaxies: Connections to Lyman continuum leakage
The atomic gas properties of Green Pea galaxies: Connections to Lyman continuum leakage Open
We have used the Green Bank Telescope to search for H{\sc{i}} 21\,cm emission from 30 Green Pea galaxies (GPs) at $z\approx0.012-0.045$, obtaining 7 detections of H{\sc{i}} 21\,cm emission and 17 upper limits on the H{\sc{i}} mass. Includi…
View article: Chandra Detects Low-luminosity Active Galactic Nucleus with <i>M</i> <sub>BH</sub> = 10<sup>4</sup>–10<sup>6</sup> <i> M</i> <sub>⊙</sub> in Nearby (<i>z</i> < 0.5) Dwarf and Star-forming Galaxies
Chandra Detects Low-luminosity Active Galactic Nucleus with <i>M</i> <sub>BH</sub> = 10<sup>4</sup>–10<sup>6</sup> <i> M</i> <sub>⊙</sub> in Nearby (<i>z</i> < 0.5) Dwarf and Star-forming Galaxies Open
We searched the Chandra and XMM archives for 900 Green Pea galaxies to identify signs of active galactic nuclei (AGN). Green peas are low-mass, emission-line galaxies that resemble high-redshift dwarf galaxies. From 29 observations, we det…
View article: Discovery of Local Analogs to JWST’s Little Red Dots
Discovery of Local Analogs to JWST’s Little Red Dots Open
Recently, the James Webb Space Telescope has revealed a new class of high-redshift (high- z , z > 4) compact galaxies that are red in the rest-frame optical and blue in the rest-frame UV with V-shaped spectral energy distributions (SEDs), …
View article: UNCOVERing the Faint End of the z ∼ 7 [O iii] Luminosity Function with JWST’s F410M Medium Bandpass Filter
UNCOVERing the Faint End of the z ∼ 7 [O iii] Luminosity Function with JWST’s F410M Medium Bandpass Filter Open
Strong emission from doubly ionized oxygen is a beacon for some of the most intensely star-forming galaxies. JWST enables the search for this beacon in the early Universe with unprecedented sensitivity. Using UNCOVER DR1 JWST/NIRCam and Hu…
View article: JWST Early Release Science Program TEMPLATES: Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star Formation
JWST Early Release Science Program TEMPLATES: Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star Formation Open
This paper gives an overview of Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star formation (TEMPLATES), a JWST Early Release Science program that targeted four extremely bright, gravitationally lensed galaxies…
View article: ESpRESSO -- Forward modeling Roman Space Telescope spectroscopy
ESpRESSO -- Forward modeling Roman Space Telescope spectroscopy Open
We describe the software package $\texttt{ESpRESSO}$ - [E]xtragalactic [Sp]ectroscopic [R]oman [E]mulator and [S]imulator of [S]ynthetic [O]bjects, created to emulate the slitless spectroscopic observing modes of the Nancy Grace Roman Spac…
View article: Discovery of Local Analogs to JWST's Little Red Dots
Discovery of Local Analogs to JWST's Little Red Dots Open
Recently, the James Webb Space Telescope (JWST) has revealed a new class of high redshift (high-$z$, $z>4$) compact galaxies which are red in the rest-frame optical and blue in the rest-frame UV as V-shaped spectral energy distributions (S…
View article: The Second Case of a Major Merger Triggering a Starburst in a Green Pea Galaxy
The Second Case of a Major Merger Triggering a Starburst in a Green Pea Galaxy Open
We have used the Karl G. Jansky Very Large Array (VLA) to map H i 21 cm emission from the Green Pea galaxy GP J1148+2546 at z ≈ 0.0451, only the second measurement of the H i spatial distribution of a Green Pea. The VLA H i 21 cm image, th…
View article: Evolution of H α equivalent widths from z ∼ 0.4 - 2.2: implications for star formation and legacy surveys with <i>Roman</i> and <i>Euclid</i>
Evolution of H α equivalent widths from z ∼ 0.4 - 2.2: implications for star formation and legacy surveys with <i>Roman</i> and <i>Euclid</i> Open
Past studies have investigated the evolution in specific star formation rate (sSFR) and its observational proxy (H $\alpha$ equivalent width; EW) up to $z \sim 6$; however, such measurements may overestimate the typical sSFR/EW at a given …
View article: Evolution of H$α$ Equivalent Widths from $z \sim 0.4-2.2$: implications for star formation and legacy surveys with Roman and Euclid
Evolution of H$α$ Equivalent Widths from $z \sim 0.4-2.2$: implications for star formation and legacy surveys with Roman and Euclid Open
We investigate the `intrinsic' H$α$ EW distributions of $z \sim 0.4 - 2.2$ narrowband-selected H$α$ samples from HiZELS and DAWN using a forward modeling approach. We find an EW - stellar mass anti-correlation with steepening slopes $-0.18…
View article: UNCOVERing the Faint-End of the z=7 [OIII] Luminosity Function with JWST's F410M Medium Bandpass Filter
UNCOVERing the Faint-End of the z=7 [OIII] Luminosity Function with JWST's F410M Medium Bandpass Filter Open
Strong emission from doubly ionized oxygen is a beacon for some of the most intensely star forming galaxies known. JWST enables the search for this beacon in the early universe with unprecedented sensitivity. In this work, we extend the st…
View article: A lack of Lyman <i>α</i> emitters within 5 Mpc of a luminous quasar in an overdensity at <i>z</i> = 6.9: Potential evidence of negative quasar feedback at protocluster scales
A lack of Lyman <i>α</i> emitters within 5 Mpc of a luminous quasar in an overdensity at <i>z</i> = 6.9: Potential evidence of negative quasar feedback at protocluster scales Open
High-redshift quasars are thought to live in the densest regions of space, which should be made evident by an overdensity of galaxies around them. However, campaigns to identify these overdensities by searching for Lyman-break galaxies (LB…
View article: Chandra detects low-luminosity AGN with $M_\mathrm{BH}=10^{4}-10^{6}~M_\mathrm{\odot}$ in nearby ($z<0.5$), dwarf and star-forming galaxies
Chandra detects low-luminosity AGN with $M_\mathrm{BH}=10^{4}-10^{6}~M_\mathrm{\odot}$ in nearby ($z<0.5$), dwarf and star-forming galaxies Open
We searched the Chandra and XMM archives for observations of 900 green pea galaxies to find AGN signatures. Green peas are low-mass galaxies with prominent emission lines, similar in size and star formation rate to high-redshift dwarf gala…
View article: TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time-domain Field
TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time-domain Field Open
The James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-domain Field (TDF) is a >14′ diameter field optimized for multiwavelength time-domain science with JWST. It has been observed across the electromagnetic spectrum both fro…
View article: Lyα at Cosmic Dawn with a Simulated Roman Grism Deep Field
Lyα at Cosmic Dawn with a Simulated Roman Grism Deep Field Open
The slitless grism on the Nancy Grace Roman Space Telescope will enable deep near-infrared spectroscopy over a wide field of view. We demonstrate Roman's capability to detect Ly α galaxies at z > 7 using a multiple position angle (PA) obse…
View article: The Hubble Deep Hydrogen Alpha (HDHα) Project. I. Catalog of Emission-line Galaxies
The Hubble Deep Hydrogen Alpha (HDHα) Project. I. Catalog of Emission-line Galaxies Open
We present the first results of the Hubble Deep Hydrogen Alpha (HDH α ) project, which analyzes the space-borne deep H α narrowband imaging data in the GOODS-S region. The HDH α data comprises 72 orbits’ images taken with the Hubble Space …
View article: TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time Domain Field
TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time Domain Field Open
The JWST North Ecliptic Pole (NEP) Time Domain Field (TDF) is a $>$14 arcmin diameter field optimized for multi-wavelength time-domain science with JWST. It has been observed across the electromagnetic spectrum both from the ground and fro…
View article: The Hubble Deep Hydrogen Alpha (HDH$α$) Project: I. Catalog of Emission-line Galaxies
The Hubble Deep Hydrogen Alpha (HDH$α$) Project: I. Catalog of Emission-line Galaxies Open
We present the first results of the Hubble Deep Hydrogen Alpha (HDH$α$) project, which analyzes the space-borne deep H$α$ narrowband imaging data in the GOODS-S region. The HDH$α$ data comprises 72 orbits' images taken with the HST ACS/WFC…
View article: Predicting the Yields of z > 6.5 Quasar Surveys in the Era of Roman and Rubin
Predicting the Yields of z > 6.5 Quasar Surveys in the Era of Roman and Rubin Open
About 70 luminous quasars discovered at z > 6.5 are strongly biased toward the bright end, thus not providing a comprehensive view of quasar abundance beyond the cosmic dawn. We present the predicted results of the Roman/Rubin high-redshif…
View article: Predicting the Yields of $z$ > 6.5 Quasar Surveys in the Era of Roman and Rubin
Predicting the Yields of $z$ > 6.5 Quasar Surveys in the Era of Roman and Rubin Open
Around 70 $z>6.5$ luminous quasars have been discovered, strongly biased toward the bright end, thus not providing a comprehensive view on quasar abundance beyond cosmic dawn. We present the predicted results of Roman/Rubin high-redshift q…
View article: Discovery of five <i>Green pea</i> galaxies with double-peaked narrow [O <scp>iii</scp>] lines
Discovery of five <i>Green pea</i> galaxies with double-peaked narrow [O <span>iii</span>] lines Open
Although double-peaked narrow emission-line galaxies have been studied extensively in the past years, only a few are reported with the Green pea (GP) galaxies. Here we present our discovery of five GP galaxies with double-peaked narrow [O …
View article: Strongly lensed [O III] emitters at Cosmic Noon with Roman: Characterizing extreme emission line galaxies on star cluster complex scales (100 pc)
Strongly lensed [O III] emitters at Cosmic Noon with Roman: Characterizing extreme emission line galaxies on star cluster complex scales (100 pc) Open
Extreme emission line galaxies (EELGs) are considered the primary contributor to cosmic reionization and are valuable laboratories to study the astrophysics of massive stars. It is strongly expected that Roman's High Latitude Wide Area Sur…
View article: Ly$α$ at Cosmic Dawn with a Simulated Roman Grism Deep Field
Ly$α$ at Cosmic Dawn with a Simulated Roman Grism Deep Field Open
The slitless grism on the Nancy Grace Roman Space Telescope will enable deep near-infrared spectroscopy over a wide field of view. We demonstrate Roman's capability to detect Ly$α$ galaxies at $z>7$ using a multi-position-angle (PA) observ…
View article: Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyα Emitters
Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyα Emitters Open
We use large simulations of Ly α emitters with different fractions of ionized intergalactic medium to quantify the clustering of Ly α emitters as measured by the void probability function (VPF), and how it evolves under different ionizatio…
View article: Discovery of Five Green Pea Galaxies with Double-peaked Narrow [OIII] Lines
Discovery of Five Green Pea Galaxies with Double-peaked Narrow [OIII] Lines Open
Although double-peaked narrow emission-line galaxies have been studied extensively in the past years, only a few are reported with the green pea galaxies (GPs). Here we present our discovery of five GPs with double-peaked narrow [OIII] emi…
View article: Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyman-Alpha Emitters
Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyman-Alpha Emitters Open
We use large simulations of Lyman-Alpha Emitters with different fractions of ionized intergalactic medium to quantify the clustering of Ly$α$ emitters as measured by the Void Probability function (VPF), and how it evolves under different i…
View article: Evidence for Black Holes in Green Peas from WISE Colors and Variability
Evidence for Black Holes in Green Peas from WISE Colors and Variability Open
We explore the presence of active galactic nuclei (AGNs)/black holes in Green Pea galaxies (GPs), motivated by the presence of high-ionization emission lines such as He ii and [Ne iii ] in their optical spectra. In order to identify AGN ca…