E. Franceschi
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View article: Euclid preparation. LXXXV. Toward a DR1 application of higher-order weak lensing statistics
Euclid preparation. LXXXV. Toward 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 . With respect to our first paper, we develop a full tomographic analysis bas…
View article: Euclid preparation. LXXXIV. The flat-sky approximation for the clustering of Euclid's photometric galaxies
Euclid preparation. LXXXIV. The flat-sky approximation for the clustering of Euclid's photometric galaxies Open
We compared the performance of the flat-sky approximation and Limber approximation for the clustering analysis of the photometric galaxy catalogue of Euclid. We studied a 6-bin configuration, representing the first data release (DR1), and …
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: 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 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: 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). 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). 4: Validation and Performance
Euclid preparation. Cosmology Likelihood for Observables in Euclid (CLOE). 4: Validation and Performance Open
The Euclid satellite will provide data on the clustering of galaxies and on the distortion of their measured shapes, which can be used to constrain and test the cosmological model. However, the increase in precision places strong requireme…
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: 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: <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: Euclid Quick Data Release (Q1). An investigation of optically faint, red objects in the Euclid Deep Fields
Euclid Quick Data Release (Q1). An investigation of optically faint, red objects in the Euclid Deep Fields Open
Our understanding of cosmic star formation at z > 3 used to largely rely on rest-frame UV observations. However, these observations overlook dusty and massive sources, resulting in an incomplete census of early star-forming galaxies. Recen…
View article: Euclid preparation. Predicting star-forming galaxy scaling relations with the spectral stacking code SpectraPyle
Euclid preparation. Predicting star-forming galaxy scaling relations with the spectral stacking code SpectraPyle Open
We introduce SpectraPyle, a versatile spectral stacking pipeline developed for the Euclid mission's NISP spectroscopic surveys, aimed at extracting faint emission lines and spectral features from large galaxy samples in the Wide and Deep S…
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: <i>Euclid</i> : Finding strong gravitational lenses in the early release observations using convolutional neural networks
<i>Euclid</i> : Finding strong gravitational lenses in the early release observations using convolutional neural networks Open
Several new galaxy-galaxy strong gravitational lenses have been detected in the early release observations (ERO) from Euclid . The all-sky survey is expected to find 170 000 new systems, which are expected to greatly enhancing studies of d…
View article: Euclid preparation. LXXIV. Euclidised observations of Hubble Frontier Fields and CLASH galaxy clusters
Euclid preparation. LXXIV. Euclidised observations of Hubble Frontier Fields and CLASH galaxy clusters Open
We present HST2EUCLID, a novel Python code to generate Euclid realistic mock images in the $H_{\rm E}$, $J_{\rm E}$, $Y_{\rm E}$, and $I_{\rm E}$ photometric bands based on panchromatic Hubble Space Telescope observations. The software was…
View article: Euclid Quick Data Release (Q1). The strong-lensing discovery engine B. Early strong-lens candidates from the visual inspection of galaxies with a high-velocity dispersion
Euclid Quick Data Release (Q1). The strong-lensing discovery engine B. Early strong-lens candidates from the visual inspection of galaxies with a high-velocity dispersion Open
We present a search for strong gravitational lenses in Euclid imaging with a high stellar velocity dispersion (sigmav>180,̨ms) reported by SDSS and DESI. We performed expert visual inspection and classification of $11,660$ Euclid images. We…
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 Quick Data Release (Q1). Near-infrared processing and data products
Euclid Quick Data Release (Q1). Near-infrared processing and data products Open
This paper describes the NIR PF that processes NIR images from the NISP instrument on board the Euclid satellite. NIR PF consists of three main components: (i) a common pre-processing stage for both photometric (NIR) and spectroscopic (SIR…
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…
View article: Euclid Quick Data Release (Q1). First detections from the Euclid galaxy cluster workflow
Euclid Quick Data Release (Q1). First detections from the Euclid galaxy cluster workflow Open
The first survey data release by the Euclid mission covers approximately 63 in the Euclid Deep Fields to the same depth as the Euclid Wide Survey. This paper showcases, for the first time, the performance of cluster finders on Euclid data …