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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: The first SRG/eROSITA All-Sky Survey
The first SRG/eROSITA All-Sky Survey Open
The detection of the extended X-ray emission of the intracluster medium by the first SRG/eROSITA All-Sky Survey (eRASS1), combined with optical and near-infrared follow-up, resulted in the identification of more than 12 000 galaxy clusters…
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 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 ̋S, a novel Python code to generate Euclid realistic mock images in the ̋E and photometric bands based on panchromatic Hubble Space Telescope observations. The software was used to create a simulated database of Euclid images for …
View article: Time-delay cosmography: analysis of quadruply lensed QSO SDSSJ1433 from Wendelstein Observatory
Time-delay cosmography: analysis of quadruply lensed QSO SDSSJ1433 from Wendelstein Observatory Open
The goal of this work is to estimate the Hubble constant $H_0$ through the time-delay cosmographic study of the quadruply lensed, variable quasi-stellar objects (QSO) SDSSJ1433+6007. We combine multifilter, archival Hubble Space Telescope …
View article: Euclid Quick Data Release (Q1). The Strong Lensing Discovery Engine C: Finding lenses with machine learning
Euclid Quick Data Release (Q1). The Strong Lensing Discovery Engine C: Finding lenses with machine learning Open
Strong gravitational lensing has the potential to provide a powerful probe of astrophysics and cosmology, but fewer than 1000 strong lenses have been confirmed so far. With a resolution covering a third of the sky, the Euclid telescope wil…
View article: Euclid preparation: The NISP spectroscopy channel, on ground performance and calibration
Euclid preparation: The NISP spectroscopy channel, on 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 Quick Data Release (Q1). A first view of the star-forming main sequence in the Euclid Deep Fields
Euclid Quick Data Release (Q1). A first view of the star-forming main sequence in the Euclid Deep Fields Open
The star-forming main sequence (SFMS) is a tight relation observed between stellar masses and star formation rates (SFR) in a population of galaxies. This relation is observed at different redshifts, in various morphological, and environme…
View article: <i>Euclid</i>: Early Release Observations – Overview of the Perseus cluster and analysis of its luminosity and stellar mass functions★
<i>Euclid</i>: Early Release Observations – Overview of the Perseus cluster and analysis of its luminosity and stellar mass functions★ Open
The Euclid Early Release Observations (ERO) programme targeted the Perseus cluster of galaxies, gathering deep data in the central region of the cluster over 0.7 deg 2 , including the cluster core up to 0.25 r 200 . The dataset reaches a p…
View article: Euclid Quick Data Release (Q1) The Strong Lensing Discovery Engine B -- Early strong lens candidates from visual inspection of high velocity dispersion galaxies
Euclid Quick Data Release (Q1) The Strong Lensing Discovery Engine B -- Early strong lens candidates from visual inspection of high velocity dispersion galaxies Open
We present a search for strong gravitational lenses in Euclid imaging with high stellar velocity dispersion ($\sigma_\nu > 180$ km/s) reported by SDSS and DESI. We performed expert visual inspection and classification of $11\,660$ \Euclid …
View article: Euclid Quick Data Release (Q1): VIS processing and data products
Euclid Quick Data Release (Q1): VIS processing and data products Open
This paper describes the VIS Processing Function (VIS PF) of the Euclid ground segment pipeline, which processes and calibrates raw data from the VIS camera. We present the algorithms used in each processing element, along with a descripti…
View article: Euclid Quick Data Release (Q1). The Strong Lensing Discovery Engine E -- Ensemble classification of strong gravitational lenses: lessons for Data Release 1
Euclid Quick Data Release (Q1). The Strong Lensing Discovery Engine E -- Ensemble classification of strong gravitational lenses: lessons for Data Release 1 Open
The Euclid Wide Survey (EWS) is expected to identify of order $100\,000$ galaxy-galaxy strong lenses across $14\,000$deg$^2$. The Euclid Quick Data Release (Q1) of $63.1$deg$^2$ Euclid images provides an excellent opportunity to test our l…
View article: Euclid Quick Data Release (Q1). Active galactic nuclei identification using diffusion-based inpainting of Euclid VIS images
Euclid Quick Data Release (Q1). Active galactic nuclei identification using diffusion-based inpainting of Euclid VIS images Open
Light emission from galaxies exhibit diverse brightness profiles, influenced by factors such as galaxy type, structural features and interactions with other galaxies. Elliptical galaxies feature more uniform light distributions, while spir…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The Cosmic Dawn Survey (DAWN survey) provides multiwavelength (UV/optical to mid-IR) data across the combined 59 deg 2 of the Euclid Deep and Auxiliary fields (EDFs and EAFs). In this work, the first public data release from the DAWN surve…
View article: Modeling Tidal Streams and Tidal Tails around Galaxies Using Deep Wendelstein Imaging Data
Modeling Tidal Streams and Tidal Tails around Galaxies Using Deep Wendelstein Imaging Data Open
From the Λ cold dark matter paradigm, it is expected that galaxies merge and grow in their environments. These processes form various tidal features depending on the merger mass ratio, orbital parameters, and gas richness. We inspected 170…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The Euclid mission is generating a vast amount of imaging data in four broadband filters at a high angular resolution. This data will allow for the detailed study of mass, metallicity, and stellar populations across galaxies that will cons…
View article: <i>Euclid</i>: A complete Einstein ring in NGC 6505
<i>Euclid</i>: A complete Einstein ring in NGC 6505 Open
We report the discovery of a complete Einstein ring around the elliptical galaxy NGC 6505, at z = 0.042. This is the first strong gravitational lens discovered in Euclid and the first in an NGC object from any survey. The combination of th…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
Euclid will provide deep near-infrared (NIR) imaging to ∼26.5 AB magnitude over ∼59 deg 2 in its deep and auxiliary fields. The Cosmic DAWN survey combines dedicated and archival UV–NIR observations to provide matched depth multiwavelength…
View article: Euclid preparation - LXVIII. Extracting physical parameters from galaxies with machine learning
Euclid preparation - LXVIII. Extracting physical parameters from galaxies with machine learning Open
The Euclid mission is generating a vast amount of imaging data in four broadband filters at high angular resolution. This will allow the detailed study of mass, metallicity, and stellar populations across galaxies, which will constrain the…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The Euclid mission of the European Space Agency will provide weak gravitational lensing and galaxy clustering surveys that can be used to constrain the standard cosmological model and its extensions, with an opportunity to test the propert…
View article: The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies—3D Dynamics and Radially Resolved Stellar Initial Mass Functions
The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies—3D Dynamics and Radially Resolved Stellar Initial Mass Functions Open
We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity…
View article: The VIRUS-dE Survey. II. Cuspy and Round Halos in Dwarf Ellipticals—A Result of Early Assembly?
The VIRUS-dE Survey. II. Cuspy and Round Halos in Dwarf Ellipticals—A Result of Early Assembly? Open
We analyze the dark matter (DM) halos of a sample of dwarf ellipticals (dEs) and discuss cosmological and evolutionary implications. Using orbit modeling, we recover their density slopes and, for the first time, halo flattening. We find th…
View article: <i>Euclid</i>
<i>Euclid</i> Open
This paper presents the specification, design, and development of the Visible Camera (VIS) on the European Space Agency’s Euclid mission. VIS is a large optical-band imager with a field of view of 0.54 deg 2 sampled at 0″.1 with an array o…
View article: The Black Hole Mass and Photometric Components of NGC 4826
The Black Hole Mass and Photometric Components of NGC 4826 Open
We present infrared photometry and Hubble Space Telescope imaging and spectroscopy of the Sab galaxy NGC 4826. Schwarzschild dynamical modeling is used to measure its central black hole mass M . Photometric decomposition is used to enable …
View article: <i>Euclid</i>: Early Release Observations – Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field
<i>Euclid</i>: Early Release Observations – Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field Open
We present an analysis of Euclid observations of a 0.6 deg 2 field in the central region of the Fornax galaxy cluster that were acquired during the performance verification phase. With these data, we investigated the potential of Euclid to…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
Euclid will collect an enormous amount of data during the mission’s lifetime, observing billions of galaxies in the extragalactic sky. Along with traditional template-fitting methods, numerous machine learning (ML) algorithms have been pre…
View article: <i>Euclid</i>
<i>Euclid</i> Open
The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015–2025…
View article: The Black Hole Mass and Photometric Components of NGC 4826
The Black Hole Mass and Photometric Components of NGC 4826 Open
We present IR photometry and HST imaging and spectroscopy of Sab galaxy NGC 4826. Schwarzschild dynamical modeling is used to measure its central black hole mass $M$. Photometric decomposition is used to enable a comparison of $M$ to publi…
View article: Euclid preparation. LXVII. Deep learning true galaxy morphologies for weak lensing shear bias calibration
Euclid preparation. LXVII. Deep learning true galaxy morphologies for weak lensing shear bias calibration Open
To date, galaxy image simulations for weak lensing surveys usually approximate the light profiles of all galaxies as a single or double Sérsic profile, neglecting the influence of galaxy substructures and morphologies deviating from such a…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
The Euclid mission is expected to image millions of galaxies at high resolution, providing an extensive dataset with which to study galaxy evolution. Because galaxy morphology is both a fundamental parameter and one that is hard to determi…