J. Stuart B. Wyithe
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View article: Galaxy-scale lens search in the PEARLS NEP TDF and CEERS JWST fields
Galaxy-scale lens search in the PEARLS NEP TDF and CEERS JWST fields Open
We present four galaxy scale lenses discovered in two JWST blank-fields: the ∼ 54 arcmin2 of the PEARLS North-Ecliptic-Pole Time-Domain Field (NEP TDF) and in the ∼90 arcmin2 of CEERS. We perform the search by visual inspection of NIRCam p…
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: 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: The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today Open
Where in the present-day Milky Way should we search for the remnants of its earliest stars? We address this question using the DORCHA (Gaelic for Dark; DUR-uh-khuh) suite: a set of 25 high-resolution, dark-matter-only cosmological zoom-in …
View article: Biases in stellar masses of JWST high-z quasar host galaxies caused by quasar subtraction
Biases in stellar masses of JWST high-z quasar host galaxies caused by quasar subtraction Open
JWST has enabled a new era of understanding high-z galaxy and black hole evolution with more than 30 high-z quasar host galaxy detections. Many of these observations imply galaxies with black holes that are overmassive compared to their lo…
View article: Achieving Gender Representation in Lead-Author Publications in the ASTRO3D Centre of Excellence
Achieving Gender Representation in Lead-Author Publications in the ASTRO3D Centre of Excellence Open
We examine the publication rates of 400 research-focused members in the ASTRO3D Centre of Excellence by gender, project, and year from January 2018 to January 2024 (six years). Of the 443 refereed publications led by ASTRO3D members, women…
View article: Semi-analytical modelling of Pop. III star formation and metallicity evolution – II. Impact on 21 cm power spectrum
Semi-analytical modelling of Pop. III star formation and metallicity evolution – II. Impact on 21 cm power spectrum Open
Simulating Population (Pop.) III star formation in mini-haloes in a large cosmological simulation is an extremely challenging task but it is crucial to estimate its impact on the 21 cm power spectrum. In this work, we develop a framework w…
View article: A model for the emission-line galaxy luminosity function and flux ratios at high redshifts
A model for the emission-line galaxy luminosity function and flux ratios at high redshifts Open
We present $[{\rm{\rm O\,{\small III}}}]/\mathrm{ H}_{\rm \beta }$ emission-line flux ratio predictions for galaxies at $z \sim 7-9$ using the mappings v v5.2.0 photoionization modelling code combined with an analytic galaxy formation mode…
View article: Semi-analytic modelling of Pop. III star formation and metallicity evolution -- II. Impact on 21cm power spectrum
Semi-analytic modelling of Pop. III star formation and metallicity evolution -- II. Impact on 21cm power spectrum Open
Simulating Population (Pop.) III star formation in mini-halos in a large cosmological simulation is an extremely challenging task but it is crucial to estimate its impact on the 21cm power spectrum. In this work, we develop a framework wit…
View article: Velocity dispersion function evolution from strong lensing statistics
Velocity dispersion function evolution from strong lensing statistics Open
The redshift and size distributions of galaxy-scale strong lenses depend on the evolution of early-type galaxies. We use this dependence to constrain the velocity dispersion function (VDF) evolution from the Strong Lensing Legacy Survey sa…
View article: Reionization morphology and intrinsic velocity offsets allow transmission of Lyman-α emission from JADES-GS-z13-1-LA
Reionization morphology and intrinsic velocity offsets allow transmission of Lyman-α emission from JADES-GS-z13-1-LA Open
We investigate the detectability of Lyman-$\alpha$ (Ly $\alpha$) emission from galaxies at the onset of cosmic reionization, aiming to understand the conditions necessary for detecting high-redshift sources like JADES-GS-z13-1-LA at $z=13$…
View article: A model for the emission line galaxy luminosity function and flux ratios at high-redshifts
A model for the emission line galaxy luminosity function and flux ratios at high-redshifts Open
We present $[OIII]/H_{\rm β}$ emision line flux ratio predictions for galaxies at $z \sim 7-9$ using the MAPPINGS V v5.2.0 photoionization modelling code combined with an analytic galaxy formation model. Properties such as pressure and ion…
View article: Velocity dispersion function evolution from strong lensing statistics
Velocity dispersion function evolution from strong lensing statistics Open
The redshift and size distributions of galaxy scale strong lenses depend on the evolution of early-type galaxies (ETGs). We use this dependence to constrain the velocity dispersion function (VDF) evolution from the Strong Lensing Legacy Su…
View article: Galaxy Assembly Bias in the Stellar-to-halo Mass Relation for Red Central Galaxies from SDSS
Galaxy Assembly Bias in the Stellar-to-halo Mass Relation for Red Central Galaxies from SDSS Open
We report evidence of galaxy assembly bias—the correlation between galaxy properties and biased secondary halo properties at fixed halo mass ( M H )—in the stellar-to-halo mass relation for red central galaxies from the Sloan Digital Sky S…
View article: Reionization morphology and intrinsic velocity offsets allow transmission of Lyman-α emission from JADES-GS-z13-1-LA
Reionization morphology and intrinsic velocity offsets allow transmission of Lyman-α emission from JADES-GS-z13-1-LA Open
We investigate the detectability of Lyman-$α$ (Ly$α$) emission from galaxies at the onset of cosmic reionization, aiming to understand the conditions necessary for detecting high-redshift sources like JADES-GS-z13-1-LA at $z=13$. By integr…
View article: A model for galaxy–galaxy strong lensing statistics in surveys
A model for galaxy–galaxy strong lensing statistics in surveys Open
Photometric wide-area observations in the next decade will be capable of detecting a large number of galaxy-scale strong gravitational lenses, increasing the gravitational lens sample size by orders of magnitude. To aid in forecasting and …
View article: Simulated host galaxy analogues of high-z quasars observed with <i>JWST</i>
Simulated host galaxy analogues of high-z quasars observed with <i>JWST</i> Open
The hosts of two low-luminosity high-z quasars, J2255+0251 and J2236+0032, were recently detected using JWST’s NIRCam instrument. These represent the first high-z quasar host galaxy stellar detections and open a new window into studying hi…
View article: The impact of ionization morphology and X-ray heating on the cosmological 21-cm skew spectrum
The impact of ionization morphology and X-ray heating on the cosmological 21-cm skew spectrum Open
The cosmological 21-cm signal offers a potential probe of the early Universe and the first ionizing sources. Current experiments probe the spatially dependent variance (Gaussianity) of the signal through the power spectrum (PS). The signal…
View article: Semi-analytic modelling of Pop. III star formation and metallicity evolution – I. Impact on the UV luminosity functions at <i>z</i> = 9–16
Semi-analytic modelling of Pop. III star formation and metallicity evolution – I. Impact on the UV luminosity functions at <i>z</i> = 9–16 Open
We implemented Population III (Pop. III) star formation in mini-haloes within the Meraxes semi-analytic galaxy formation and reionization model, run on top of a N-body simulation with L = 10 h−1 cMpc with 20483 particles resolving all dark…
View article: Simulated host galaxy analogs of high-z quasars observed with JWST
Simulated host galaxy analogs of high-z quasars observed with JWST Open
The hosts of two low-luminosity high-z quasars, J2255+0251 and J2236+0032, were recently detected using JWST's NIRCam instrument. These represent the first high-z quasar host galaxy stellar detections and open a new window into studying hi…
View article: Semi-analytic modelling of Pop. III star formation and metallicity evolution -- I. Impact on the UV luminosity functions at z = 9-16
Semi-analytic modelling of Pop. III star formation and metallicity evolution -- I. Impact on the UV luminosity functions at z = 9-16 Open
We implemented Population III (Pop. III) star formation in mini-halos within the MERAXES semi-analytic galaxy formation and reionisation model, run on top of a N-body simulation with $L = 10 h^{-1}$ cMpc with 2048$^3$ particles resolving a…
View article: Dark-ages reionization and galaxy formation simulation – XXI. Constraining the evolution of the ionizing escape fraction
Dark-ages reionization and galaxy formation simulation – XXI. Constraining the evolution of the ionizing escape fraction Open
The fraction of ionizing photons that escape their host galaxies to ionize hydrogen in the intergalactic medium (IGM) is a critical parameter in analyses of the reionization era. In this paper, we use the meraxes semi-analytic galaxy forma…
View article: Accelerated Formation of Ultra-Massive Galaxies in the First Billion Years
Accelerated Formation of Ultra-Massive Galaxies in the First Billion Years Open
Recent JWST observations have revealed an unexpected abundance of massive galaxy candidates in the early Universe, extending further in redshift and to lower luminosity than what had previously been found by sub-millimeter surveys. These J…
View article: Fisher matrix forecasts on the astrophysics of galaxies during the epoch of reionization from the 21-cm power spectra
Fisher matrix forecasts on the astrophysics of galaxies during the epoch of reionization from the 21-cm power spectra Open
The hyperfine 21-cm transition of neutral hydrogen from the early Universe (z > 5) is a sensitive probe of the formation and evolution of the first luminous sources. Using the Fisher matrix formalism we explore the complex and degenerat…
View article: The <i>JWST</i> FRESCO survey: legacy NIRCam/grism spectroscopy and imaging in the two GOODS fields
The <i>JWST</i> FRESCO survey: legacy NIRCam/grism spectroscopy and imaging in the two GOODS fields Open
We present the JWST cycle 1 53.8 h medium program FRESCO, short for ‘First Reionization Epoch Spectroscopically Complete Observations’. FRESCO covers 62 arcmin2 in each of the two GOODS/CANDELS fields for a total area of 124 arcmin2 exploi…
View article: Efficient Reionization in a Large Hydrodynamic Galaxy Formation Simulation
Efficient Reionization in a Large Hydrodynamic Galaxy Formation Simulation Open
Accuracy in the topology and statistics of a simulated Epoch of Reionization (EoR) are vital to draw connections between observations and physical processes. While full radiative transfer models produce the most accurate reionization model…
View article: Implications of $z>{\sim}12$ JWST galaxies for galaxy formation at high redshift
Implications of $z>{\sim}12$ JWST galaxies for galaxy formation at high redshift Open
Using a semi-analytic galaxy-formation model, we study analogues of 8 recently discovered JWST galaxies at $z>{\sim}12$. We select analogues from a cosmological simulation with a $(311{\rm cMpc})^3$ volume and an effective particle number …
View article: Gravitational lensing modification of the high-redshift galaxy luminosity function
Gravitational lensing modification of the high-redshift galaxy luminosity function Open
The bright end of the rest-frame ultraviolet luminosity function (UVLF) of high-redshift galaxies is modified by gravitational lensing magnification bias. Motivated by recent discoveries of very high-z galaxies with JWST, we study the depe…
View article: The JWST FRESCO Survey: Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields
The JWST FRESCO Survey: Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields Open
We present the JWST Cycle 1 53.8hr medium program FRESCO, short for "First Reionization Epoch Spectroscopically Complete Observations". FRESCO covers 62 arcmin$^2$ in each of the two GOODS/CANDELS fields for a total area of 124 arcmin$^2$ …
View article: JWST’s PEARLS: Dust Attenuation and Gravitational Lensing in the Backlit-galaxy System VV 191
JWST’s PEARLS: Dust Attenuation and Gravitational Lensing in the Backlit-galaxy System VV 191 Open
We derive the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV 191b using backlighting by the superimposed elliptical system VV 191a in a pair with an exceptionally favorable geometry for this meas…