A. Hornstrup
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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: Euclid preparation. Controlling angular systematics in the Euclid spectroscopic galaxy sample
Euclid preparation. Controlling angular systematics in the Euclid spectroscopic galaxy sample Open
We present the strategy to identify and mitigate potential sources of angular systematics in the Euclid spectroscopic galaxy survey, and we quantify their impact on galaxy clustering measurements and cosmological parameter estimation. We f…
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: 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 preparation. LXXVII. The NISP spectroscopy channel: Ground performance and calibration
Euclid preparation. LXXVII. The NISP spectroscopy channel: Ground performance and calibration Open
ESA's Euclid cosmology mission relies on the very sensitive and accurately calibrated spectroscopy channel of the Near-Infrared Spectrometer and Photometer (NISP). With three operational grisms in two wavelength intervals, NISP provides di…
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: Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS
Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS Open
We present a search for $z\simeq7$ Lyman-break galaxies using the $1.72 \, \rm{deg}^2$ near-infrared UltraVISTA survey in the COSMOS field, reaching $5\,σ$ depths in $Y$ of 26.2. We incorporate deep optical and Spitzer imaging for a full s…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The Euclid Space Telescope will image about 14 000 deg 2 of the extragalactic sky at visible and near-infrared wavelengths, providing a dataset of unprecedented size and richness that will facilitate a multitude of studies into the evoluti…
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: Euclid: methodology for derivation of IPC-corrected conversion gain of nonlinear CMOS APS
Euclid: methodology for derivation of IPC-corrected conversion gain of nonlinear CMOS APS Open
We introduce a fast method to measure the conversion gain in complementary metal-oxide-semiconductor (CMOS) active pixel sensors (APS), which accounts for nonlinearity and interpixel capacitance (IPC). The standard ``mean-variance'' method…
View article: Euclid preparation. Using mock Low Surface Brightness dwarf galaxies to probe Wide Survey detection capabilities
Euclid preparation. Using mock Low Surface Brightness dwarf galaxies to probe Wide Survey detection capabilities Open
Local Universe dwarf galaxies are both cosmological and mass assembly probes. Deep surveys have enabled the study of these objects down to the low surface brightness (LSB) regime. In this paper, we estimate Euclid's dwarf detection capabil…
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: Euclid: Photometric redshift calibration with self-organising maps
Euclid: Photometric redshift calibration with self-organising maps Open
The Euclid survey aims to trace the evolution of cosmic structures up to redshift $z$ $\sim$ 3 and beyond. Its success depends critically on obtaining highly accurate mean redshifts for ensembles of galaxies $n(z)$ in all tomographic bins,…
View article: Euclid: Forecasts on $Λ$CDM consistency tests with growth rate data
Euclid: Forecasts on $Λ$CDM consistency tests with growth rate data Open
The large-scale structure (LSS) of the Universe is an important probe for deviations from the canonical cosmological constant $Λ$ and cold dark matter ($Λ$CDM) model. A statistically significant detection of any deviations would signify th…
View article: Euclid preparation: Expected constraints on initial conditions
Euclid preparation: Expected constraints on initial conditions Open
The Euclid mission of the European Space Agency will deliver galaxy and cosmic shear surveys, which will be used to constrain initial conditions and statistics of primordial fluctuations. We present highlights for the Euclid scientific cap…
View article: Euclid preparation. Simulating thousands of Euclid spectroscopic skies
Euclid preparation. Simulating thousands of Euclid spectroscopic skies Open
We present two extensive sets of 3500+1000 simulations of dark matter haloes on the past light cone, and two corresponding sets of simulated (`mock') galaxy catalogues that represent the Euclid spectroscopic sample. The simulations were pr…
View article: Euclid Quick Data Release (Q1). Galaxy shapes and alignments in the cosmic web
Euclid Quick Data Release (Q1). Galaxy shapes and alignments in the cosmic web Open
Galaxy morphologies and shape orientations are expected to correlate with their large-scale environments, since they grow by accreting matter from the cosmic web and are subject to interactions with other galaxies. We extracted cosmic fila…
View article: Euclid: Early Release Observations. Weak gravitational lensing analysis of Abell 2390
Euclid: Early Release Observations. Weak gravitational lensing analysis of Abell 2390 Open
The Euclid space telescope of the European Space Agency (ESA) is designed to provide sensitive and accurate measurements of weak gravitational lensing distortions over wide areas on the sky. Here we present a weak gravitational lensing ana…
View article: Euclid Quick Data Release (Q1). Exploring galaxy morphology across cosmic time through Sérsic fits
Euclid Quick Data Release (Q1). Exploring galaxy morphology across cosmic time through Sérsic fits Open
We present the results of the single-component Sérsic profile fitting for the magnitude-limited sample of galaxies within the 63.1 deg^2 area of the Euclid Quick Data Release (Q1). The associated morphological catalogue includes two sets o…
View article: <i>Euclid</i>: Early Release Observations of ram-pressure stripping in the Perseus cluster
<i>Euclid</i>: Early Release Observations of ram-pressure stripping in the Perseus cluster Open
Euclid is delivering optical and near-infrared imaging data over 14 000 deg 2 on the sky at spatial resolution and surface brightness levels that can be used to understand the morphological transformation of galaxies within groups and clus…
View article: <i>Euclid</i>: Early Release Observations of diffuse stellar structures and globular clusters as probes of the mass assembly of galaxies in the Dorado group
<i>Euclid</i>: Early Release Observations of diffuse stellar structures and globular clusters as probes of the mass assembly of galaxies in the Dorado group Open
Deep surveys have helped to unveil the history of past and present galaxy mergers, and, in particular, uncovering their tidal debris and co-located globular clusters (GCs). Euclid ’s unique combination of capabilities (spatial resolution, …