K. C. Chambers
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View article: Euclid: Early Release Observations -- A combined strong and weak lensing solution for Abell 2390 beyond its virial radius
Euclid: Early Release Observations -- A combined strong and weak lensing solution for Abell 2390 beyond its virial radius Open
Euclid/ is currently mapping the distribution of matter in the Universe in detail via the weak lensing signature of billions of distant galaxies. The weak lensing signal is most prominent around galaxy clusters and can extend up to distanc…
View article: Pan-STARRS Follow-up of the Gravitational-wave Event S250818k and the Light Curve of SN2025ulz
Pan-STARRS Follow-up of the Gravitational-wave Event S250818k and the Light Curve of SN2025ulz Open
Kilonovae are the scientifically rich—but observationally elusive—optical transient phenomena associated with compact binary mergers. Only a handful of events have been discovered to date, all through multiwavelength (gamma-ray) and multim…
View article: The ANDICAM-SOFI Near-infrared and Optical type Ia Supernova (ASNOS) sample: Description and data release
The ANDICAM-SOFI Near-infrared and Optical type Ia Supernova (ASNOS) sample: Description and data release Open
Type Ia supernovae (SNe Ia) provide the most robust means of measuring extragalactic distances. While most of the effort has focused on increasing the number of SNe Ia observed in the optical, near-infrared (NIR) observations remain scarce…
View article: Normal or transitional? The evolution and properties of two type Ia supernovae in the Virgo cluster
Normal or transitional? The evolution and properties of two type Ia supernovae in the Virgo cluster Open
Type Ia supernovae (SNe Ia) are among the most precise cosmological distance indicators used to study the expansion history of the Universe. The vast increase of SN Ia data due to large-scale astrophysical surveys has led to the discovery …
View article: Euclid Quick Data Release (Q1): Identification of massive galaxy candidates at the end of the Epoch of Reionisation
Euclid Quick Data Release (Q1): Identification of massive galaxy candidates at the end of the Epoch of Reionisation Open
Probing the presence and properties of massive galaxies at high redshift is one of the most critical tests for galaxy formation models. In this work, we search for galaxies with stellar masses M* > 10^10.25 Msun at z in [5,7], i.e., toward…
View article: UNIONS: The Ultraviolet Near-infrared Optical Northern Survey
UNIONS: The Ultraviolet Near-infrared Optical Northern Survey Open
The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is a “collaboration of collaborations” that is using the Canada–France–Hawai’i Telescope, the Pan-STARRS telescopes, and the Subaru Observatory to obtain ugriz images of a core…
View article: Euclid preparation. Non-Gaussianity of 2-point statistics likelihood: Precise analysis of the matter power spectrum distribution
Euclid preparation. Non-Gaussianity of 2-point statistics likelihood: Precise analysis of the matter power spectrum distribution Open
We investigate the non-Gaussian features in the distribution of the matter power spectrum multipoles. Using the COVMOS method, we generate 100\,000 mock realisations of dark matter density fields in both real and redshift space across mult…
View article: The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision
The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision Open
We present the early radio detection and multiwavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift z = 0.257. The Australia Telescope Compact Array automatically triggered a 9 hr observation of GRB 231117A at 5.5 and …
View article: Euclid Quick Data Release (Q1). The average far-infrared properties of Euclid-selected star-forming galaxies
Euclid Quick Data Release (Q1). The average far-infrared properties of Euclid-selected star-forming galaxies Open
The first Euclid Quick Data Release contains millions of galaxies with excellent optical and near-infrared (IR) coverage. To complement this dataset, we investigate the average far-IR properties of Euclid-selected main sequence (MS) galaxi…
View article: Euclid Quick Data Release (Q1). Spectroscopic unveiling of highly ionised lines at z = 2.48-3.88
Euclid Quick Data Release (Q1). Spectroscopic unveiling of highly ionised lines at z = 2.48-3.88 Open
This study explores a rare population of sources in a currently uncharted region of spectroscopic redshift space in the Euclid Quick Data Release (Q1), and is intended potentially to support upcoming spectroscopic studies. Our goal is to i…
View article: Euclid: An emulator for baryonic effects on the matter bispectrum
Euclid: An emulator for baryonic effects on the matter bispectrum Open
The Euclid mission and other next-generation large-scale structure surveys will enable high-precision measurements of the cosmic matter distribution. Understanding the impact of baryonic processes such as star formation and active galactic…
View article: Euclid Quick Data Release (Q1). Characteristics and limitations of the spectroscopic measurements
Euclid Quick Data Release (Q1). Characteristics and limitations of the spectroscopic measurements Open
The spectroscopy processing function (SPE PF) of the Euclid pipeline is dedicated to the automatic analysis of 1D spectra to determine redshifts, line fluxes, and spectral classifications. The first Euclid Quick Data Release (Q1) delivers …
View article: Q1 SLDE missed targets
Q1 SLDE missed targets Open
AstroVink-Q1: Strong gravitational lens candidates missed in Euclid Q1 This record contains newly identified strong gravitational lens candidates discovered with the AstroVink-Q1 vision-transformer network in Euclid Quick Data Release 1 (Q…
View article: Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 6: Impact of systematic uncertainties on the cosmological analysis
Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 6: Impact of systematic uncertainties on the cosmological analysis Open
Extracting cosmological information from the Euclid galaxy survey will require modelling numerous systematic effects during the inference process. This implies varying a large number of nuisance parameters, which have to be marginalised ov…
View article: Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 3. Inference and Forecasts
Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 3. Inference and Forecasts Open
The Euclid mission aims to measure the positions, shapes, and redshifts of over a billion galaxies to provide unprecedented constraints on the nature of dark matter and dark energy. Achieving this goal requires a continuous reassessment of…
View article: Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 5. Extensions beyond the standard modelling of theoretical probes and systematic effects
Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 5. Extensions beyond the standard modelling of theoretical probes and systematic effects Open
Euclid is expected to establish new state-of-the-art constraints on extensions beyond the standard LCDM cosmological model by measuring the positions and shapes of billions of galaxies. Specifically, its goal is to shed light on the nature…
View article: Cosmology Likelihood for Observables in \Euclid (CLOE). 1. Theoretical recipe
Cosmology Likelihood for Observables in \Euclid (CLOE). 1. Theoretical recipe Open
As the statistical precision of cosmological measurements increases, the accuracy of the theoretical description of these measurements needs to increase correspondingly in order to infer the underlying cosmology that governs the Universe. …
View article: Euclid preparation: Towards a DR1 application of higher-order weak lensing statistics
Euclid preparation: Towards a DR1 application of higher-order weak lensing statistics Open
This is the second paper in the HOWLS (higher-order weak lensing statistics) series exploring the usage of non-Gaussian statistics for cosmology inference within \textit{Euclid}. With respect to our first paper, we develop a full tomograph…
View article: Pan-STARRS follow-up of the gravitational-wave event S250818k and the lightcurve of SN 2025ulz
Pan-STARRS follow-up of the gravitational-wave event S250818k and the lightcurve of SN 2025ulz Open
Kilonovae are the scientifically rich, but observationally elusive, optical transient phenomena associated with compact binary mergers. Only a handful of events have been discovered to date, all through multi-wavelength (gamma ray) and mul…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The European Space Agency’s Euclid mission will observe approximately 14000 deg 2 of the extragalactic sky and deliver high-quality imaging of a large number of galaxies. The depth and high spatial resolution of the data will enable a deta…
View article: <i>Euclid</i> : Early Release Observations – Interplay between dwarf galaxies and their globular clusters in the Perseus galaxy cluster
<i>Euclid</i> : Early Release Observations – Interplay between dwarf galaxies and their globular clusters in the Perseus galaxy cluster Open
We present an analysis of globular clusters (GCs) of dwarf galaxies in the Perseus galaxy cluster that explores the relationship between dwarf galaxy properties and their GCs. Our focus is on GC numbers ( N GC ) and GC half-number radii ( …
View article: <i>Euclid</i> : Star clusters in IC 342, NGC 2403, and Holmberg II
<i>Euclid</i> : Star clusters in IC 342, NGC 2403, and Holmberg II Open
We examine the star cluster populations in the three nearby (3.20–3.45 Mpc) galaxies IC 342, NGC 2403, and Holmberg II, observed as part of the Euclid Early Release Observations programme. Our main focus in this paper is old globular clust…
View article: Euclid Quick Data Release (Q1). First Euclid statistical study of galaxy mergers and their connection to active galactic nuclei
Euclid Quick Data Release (Q1). First Euclid statistical study of galaxy mergers and their connection to active galactic nuclei Open
Galaxy major mergers are indicated as one of the principal pathways to trigger active galactic nuclei (AGN). We present the first statistical analysis of the major merger and AGN connection in the Euclid Deep Fields, and showcase the stati…
View article: Euclid preparation. Methodology for validating the Euclid Catalogue of Galaxy Clusters using external data
Euclid preparation. Methodology for validating the Euclid Catalogue of Galaxy Clusters using external data Open
We present our methodology for identifying known clusters as counterparts to objects in the Euclid Catalogue of Galaxy Clusters (ECGC). Euclid is expected to detect a large number of optically-selected galaxy clusters over the approximatel…
View article: <i>Euclid</i>: Photometric redshift calibration performance with the clustering-redshifts technique in the Flagship 2 simulation
<i>Euclid</i>: Photometric redshift calibration performance with the clustering-redshifts technique in the Flagship 2 simulation Open
Aims. The precision of cosmological constraints from imaging surveys hinges on an accurately estimated redshift distribution n ( z ) of the tomographic bins, especially their mean redshifts. We assess the effectiveness of the clustering-re…
View article: Euclid Quick Data Release (Q1). Optical and near-infrared identification and classification of point-like X-ray selected sources
Euclid Quick Data Release (Q1). Optical and near-infrared identification and classification of point-like X-ray selected sources Open
To better understand the role of active galactic nuclei (AGN) in galaxy evolution, it is crucial to work with a complete and pure AGN sample. X-ray surveys are key to doing so, but their larger positional uncertainties complicate counterpa…
View article: Euclid preparation. Establishing the quality of the 2D reconstruction of the filaments of the cosmic web with DisPerSE using Euclid photometric redshifts
Euclid preparation. Establishing the quality of the 2D reconstruction of the filaments of the cosmic web with DisPerSE using Euclid photometric redshifts Open
Cosmic filaments are prominent structures of the matter distribution of the Universe. Modern detection algorithms are an efficient way to identify filaments in large-scale observational surveys of galaxies. Many of these methods were origi…
View article: Seeing the Outer Edge of the Infant Type Ia Supernova 2024epr in the Optical and Near Infrared
Seeing the Outer Edge of the Infant Type Ia Supernova 2024epr in the Optical and Near Infrared Open
We present optical-to-near-infrared (NIR) photometry and spectroscopy of the Type Ia supernova (SN~Ia) 2024epr, including NIR spectra observed within two days of first light. The early-time optical spectra show strong, high-velocity Ca and…
View article: The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision
The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision Open
We present the early radio detection and multi-wavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift $z=0.257$. The Australia Telescope Compact Array automatically triggered a 9-hour observation of GRB 231117A at 5.5 a…
View article: Euclid Quick Data Release (Q1). Extending the quest for little red dots to z<4
Euclid Quick Data Release (Q1). Extending the quest for little red dots to z<4 Open
Recent observations with the James Webb Space Telescope (JWST) have revealed an interesting population of sources with a compact morphology and a characteristic v-shaped continuum, namely blue at a rest frame łambda<4000,Å and red at longe…