Katherine Ormerod
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View article: REBELS-IFU: Evidence for metal-rich massive galaxies at <i>z</i> ∼ 6 − 8
REBELS-IFU: Evidence for metal-rich massive galaxies at <i>z</i> ∼ 6 − 8 Open
Metallicity is a crucial tracer of galaxy evolution, providing insights into gas accretion, star formation, and feedback. At high redshift, these processes reveal how early galaxies assembled and enriched their interstellar medium. In this…
View article: EPOCHS. III. Unbiased UV Continuum Slopes at 6.5 < <i>z</i> < 13 from Combined PEARLS GTO and Public JWST/NIRCam Imaging
EPOCHS. III. Unbiased UV Continuum Slopes at 6.5 < <i>z</i> < 13 from Combined PEARLS GTO and Public JWST/NIRCam Imaging Open
We present an analysis of rest-frame UV continuum slopes, β , using a sample of 1011 galaxies at 6.5 < z < 13 from the EPOCHS photometric sample collated from the GTO PEARLS and public ERS/GTO/GO (JADES, CEERS, NGDEEP, GLASS) JWST/NIRCam i…
View article: REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe
REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe Open
We present new ALMA [OIII]$_{88}$ observations of eight previously [CII]$_{158}$-detected galaxies at $6.8 \lesssim z \lesssim 7.7$. Six of our targets -- the primary sample -- are massive, UV-luminous galaxies drawn from the REBELS survey…
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: Detection of the 2175 Å UV bump at <i>z</i> &gt; 7: evidence for rapid dust evolution in a merging reionization-era galaxy
Detection of the 2175 Å UV bump at <i>z</i> > 7: evidence for rapid dust evolution in a merging reionization-era galaxy Open
Dust is a fundamental component of the interstellar medium within galaxies, as dust grains are highly efficient absorbers of ultraviolet (UV) and optical photons. Accurately quantifying this obscuration is crucial for interpreting galaxy s…
View article: Detection of [O <scp>iii</scp>]<sub>88 <i>μ</i>m</sub> in JADES-GS-z14-0 at <i>z</i> = 14.1793
Detection of [O <span>iii</span>]<sub>88 <i>μ</i>m</sub> in JADES-GS-z14-0 at <i>z</i> = 14.1793 Open
We report the first successful Atacama Large Millimeter/submillimeter Array (ALMA) follow-up observations of a secure z > 10 JWST-selected galaxy, by robustly detecting (6.6 σ ) the [O iii ] 88 μ m line in JADES-GS-z14-0 (hereafter GS-z14)…
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: REBELS-IFU: dust attenuation curves of 12 massive galaxies at <i>z</i> ≃ 7
REBELS-IFU: dust attenuation curves of 12 massive galaxies at <i>z</i> ≃ 7 Open
We present measurements of the dust attenuation curves of 12 massive ($9~<~\log$($M_{\star }$/${\rm M}_{\odot }$) $<~10$) Lyman-break galaxies at $z=6.5 \!\!-\!\! 7.7$ derived from JWST NIRSpec integral field unit spectroscopy. The g…
View article: REBELS-IFU: Evidence for metal-rich massive galaxies at z~6-8
REBELS-IFU: Evidence for metal-rich massive galaxies at z~6-8 Open
Metallicity is a crucial tracer of galaxy evolution, providing insights into gas accretion, star formation, and feedback. At high redshift, these processes reveal how early galaxies assembled and enriched their interstellar medium. In this…
View article: REBELS-IFU: Dust attenuation curves of 12 massive galaxies at $z\simeq7$
REBELS-IFU: Dust attenuation curves of 12 massive galaxies at $z\simeq7$ Open
We present measurements of the dust attenuation curves of 12 massive ($9~<~\log$($M_{\star}/{M}_{\odot})$ $<~10$) Lyman-break galaxies at $z=6.5-7.7$ derived from James Webb Space Telescope (JWST) NIRSpec integral field unit (IFU) spectros…
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: EPOCHS I. The Discovery and Star Forming Properties of Galaxies in the Epoch of Reionization at $6.5 < z < 18$ with PEARLS and Public JWST data
EPOCHS I. The Discovery and Star Forming Properties of Galaxies in the Epoch of Reionization at $6.5 < z < 18$ 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 bespok…
View article: EPOCHS Paper – VIII. An insight into MIRI-selected galaxies in SMACS-0723 and the benefits of deep MIRI photometry in revealing AGN and the dusty universe
EPOCHS Paper – VIII. An insight into MIRI-selected galaxies in SMACS-0723 and the benefits of deep MIRI photometry in revealing AGN and the dusty universe Open
We present the analysis of the stellar population and star formation history of 181 MIRI selected galaxies at z = 0 − 3.5 in the massive galaxy cluster field SMACS J0723.3–7327, commonly referred to as SMACS0723, using the JWST Mid-Infrare…
View article: EPOCHS Paper V. The dependence of galaxy formation on galaxy structure at <i>z</i> &lt; 7 from <i>JWST</i> observations
EPOCHS Paper V. The dependence of galaxy formation on galaxy structure at <i>z</i> < 7 from <i>JWST</i> observations Open
We measure the broad impact of galaxy structure on galaxy formation by examining the ongoing star formation and integrated star formation history as revealed through the stellar masses of galaxies at z < 7 based on JWST CEERS data from …
View article: EPOCHS Paper V. The dependence of galaxy formation on galaxy structure at z < 7 from JWST observations
EPOCHS Paper V. The dependence of galaxy formation on galaxy structure at z < 7 from JWST observations Open
We measure the broad impact of galaxy structure on galaxy formation by examining the ongoing star formation and integrated star formation history as revealed through the stellar masses of galaxies at $z < 7$ based on JWST CEERS data from t…
View article: EPOCHS III: Unbiased UV continuum slopes at 6.5
EPOCHS III: Unbiased UV continuum slopes at 6.5 Open
We present an analysis of rest-frame UV continuum slopes, $β$, using a sample of 1011 galaxies at $6.5
View article: Adding value to JWST spectra and photometry: stellar population and star formation properties of spectroscopically confirmed JADES and CEERS galaxies at <i>z</i> &gt; 7
Adding value to JWST spectra and photometry: stellar population and star formation properties of spectroscopically confirmed JADES and CEERS galaxies at <i>z</i> > 7 Open
In this paper, we discuss measurements of the stellar population and star-forming properties for 43 spectroscopically confirmed publicly available high-redshift z > 7 JWST galaxies in the JADES and CEERS observational programs. We carry…
View article: EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations
EPOCHS IV: SED Modelling 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 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 $6.5
View article: Galaxy Quenching at the High Redshift Frontier: A Fundamental Test of Cosmological Models in the Early Universe with JWST-CEERS
Galaxy Quenching at the High Redshift Frontier: A Fundamental Test of Cosmological Models in the Early Universe with JWST-CEERS Open
We present an analysis of the quenching of star formation in massive galaxies ( M * > 10 9.5 M ⊙ ) within the first 0.5–3 Gyr of the Universe’s history utilizing JWST-CEERS data. We utilize a combination of advanced statistical methods to …
View article: EPOCHS VI: the size and shape evolution of galaxies since <i>z</i> ∼ 8 with <i>JWST</i> Observations
EPOCHS VI: the size and shape evolution of galaxies since <i>z</i> ∼ 8 with <i>JWST</i> Observations Open
We present the results of a size and structural analysis of 1395 galaxies at 0.5 ≤ z ≲ 8 with stellar masses log (M*/M⊙)> 9.5 within the James Webb Space Telescope Public CEERS field that overlaps with the Hubble Space Telescope Cosmic …
View article: Galaxy quenching at the high redshift frontier: A fundamental test of cosmological models in the early universe with JWST-CEERS
Galaxy quenching at the high redshift frontier: A fundamental test of cosmological models in the early universe with JWST-CEERS Open
We present an analysis of the quenching of star formation in massive galaxies ($M_* > 10^{9.5} M_\odot$) within the first 0.5 - 3 Gyr of the Universe's history utilizing JWST-CEERS data. We utilize a combination of advanced statistical met…
View article: Adding Value to JWST Spectra and Photometry: Stellar Population and Star Formation Properties of Spectroscopically Confirmed JADES and CEERS Galaxies at $z > 7$
Adding Value to JWST Spectra and Photometry: Stellar Population and Star Formation Properties of Spectroscopically Confirmed JADES and CEERS Galaxies at $z > 7$ Open
In this paper, we discuss measurements of the stellar population and star forming properties for 43 spectroscopically confirmed publicly available high-redshift $z > 7$ JWST galaxies in the JADES and CEERS observational programs. We carry …
View article: EPOCHS VIII. An Insight into MIRI-selected Galaxies in SMACS-0723 and the Benefits of Deep MIRI Photometry in Revealing AGN and the Dusty Universe
EPOCHS VIII. An Insight into MIRI-selected Galaxies in SMACS-0723 and the Benefits of Deep MIRI Photometry in Revealing AGN and the Dusty Universe Open
We present the analysis of the stellar population and star formation history of 181 MIRI selected galaxies at redshift 0-3.5 in the massive galaxy cluster field SMACS J0723.3-7327, commonly referred to as SMACS0723, using the James Webb Sp…
View article: EPOCHS VII: discovery of high-redshift (6.5 &lt; <i>z</i> &lt; 12) AGN candidates in JWST ERO and PEARLS data
EPOCHS VII: discovery of high-redshift (6.5 < <i>z</i> < 12) AGN candidates in JWST ERO and PEARLS data Open
We present an analysis of a sample of robust high-redshift galaxies selected from the ‘blank’ fields of the Prime Extragalactic Areas for Reionization Science (PEARLS) survey and Early Release Observations (ERO) data from JWST with the aim…
View article: EPOCHS VII: Discovery of high redshift ($6.5 < z < 12$) AGN candidates in JWST ERO and PEARLS data
EPOCHS VII: Discovery of high redshift ($6.5 < z < 12$) AGN candidates in JWST ERO and PEARLS data Open
We present an analysis of a sample of robust high redshift galaxies selected photometrically from the `blank' fields of the Prime Extragalactic Areas for Reionization Science (PEARLS) survey and Early Release Observations (ERO) data of the…
View article: A Large Population of Faint 8 < z < 16 Galaxies Found in the First JWST NIRCam Observations of the NGDEEP Survey
A Large Population of Faint 8 < z < 16 Galaxies Found in the First JWST NIRCam Observations of the NGDEEP Survey Open
We present an early analysis on the search for high-redshift galaxies using the deepest public JWST imaging to date, the NGDEEP field. These data consist of six-band NIRCam imaging on the Hubble Ultra Deep Field Parallel 2 (HUDF-Par2), cov…