J. M. Diego
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View article: PASSAGES: The Discovery of a Strongly Lensed Protocluster Core Candidate at Cosmic Noon
PASSAGES: The Discovery of a Strongly Lensed Protocluster Core Candidate at Cosmic Noon Open
Investigating the processes by which galaxies rapidly build up their stellar mass during the peak of their star formation ( z = 2–3) is crucial to advancing our understanding of the assembly of large-scale structures. We report the discove…
View article: Globular Clusters in the Galaxy Cluster MACS0416 at <i>z</i> = 0.397
Globular Clusters in the Galaxy Cluster MACS0416 at <i>z</i> = 0.397 Open
We present a photometric analysis of globular clusters (GCs) in the massive galaxy cluster MACS J0416.1−2403 ( z = 0.397) using deep JWST/NIRCam imaging from the PEARLS program. Point-spread function photometry was performed in the short w…
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: Lensed stars in galaxy–galaxy strong lensing – a <i>JWST</i> prediction for the Cosmic Horseshoe
Lensed stars in galaxy–galaxy strong lensing – a <i>JWST</i> prediction for the Cosmic Horseshoe Open
We explore for the first time the possibility of detecting lensed star transients in galaxy–galaxy strong lensing systems upon repeated, deep imaging using the James Webb Space Telescope (JWST). Our calculation predicts that the extremely …
View article: Galaxy-scale lens search in the PEARLS NEP TDF and CEERS <i>JWST</i> fields
Galaxy-scale lens search in the PEARLS NEP TDF and CEERS <i>JWST</i> fields Open
We present four galaxy scale lenses discovered in two James Webb Space Telescope (JWST) blank-fields: the $\sim$54 arcmin$^2$ of the PEARLS North-Ecliptic-Pole Time-Domain Field (NEP TDF) and in the ${\sim}90$ arcmin$^2$ of CEERS. We perfo…
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: 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: JWST lens model for A370: A very low dark matter fraction for a brightest cluster galaxy and lensing properties for the Dragon arc
JWST lens model for A370: A very low dark matter fraction for a brightest cluster galaxy and lensing properties for the Dragon arc Open
We present a new lens model for the z = 0.375 galaxy cluster Abell 370, based on previously spectroscopically confirmed lensed galaxies and new lensed systems identified in JWST data, including recent data from the MAGNIF program. Based on…
View article: Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe
Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe Open
Supernova H0pe is a multiply-imaged Type Ia supernova (SN Ia) and the second lensed SN to yield a measurement of the Hubble constant by the time-delay cosmography method, finding $H_0 = 75.4^{+8.1}_{-5.5} \text{km s}^{-1} \text{Mpc}^{-1}$.…
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: Primordial black holes in the main lensing galaxy of FBQ 0951+2635
Primordial black holes in the main lensing galaxy of FBQ 0951+2635 Open
Although dark matter in galaxies may consist of elementary particles different from those that make up ordinary matter and that would be smoothly distributed (still undetected), the so-called primordial black holes (PBHs) formed soon after…
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 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: Lensed stars in galaxy-galaxy strong lensing -- a JWST prediction for the Cosmic Horseshoe
Lensed stars in galaxy-galaxy strong lensing -- a JWST prediction for the Cosmic Horseshoe Open
We explore for the first time the possibility of detecting lensed star transients in galaxy-galaxy strong lensing systems upon repeated, deep imaging using the {\it James-Webb Space Telescope} ({\it JWST}). Our calculation predicts that th…
View article: Cosmology with supernova Encore in the strong lensing cluster MACS J0138-2155: Time delays & Hubble constant measurement
Cosmology with supernova Encore in the strong lensing cluster MACS J0138-2155: Time delays & Hubble constant measurement Open
Multiply-imaged supernovae (SNe) provide a novel means of constraining the Hubble constant ($H_0$). Such measurements require a combination of precise models of the lensing mass distribution and an accurate estimate of the relative time de…
View article: Cosmology with supernova Encore in the strong lensing cluster MACS J0138-2155: Lens model comparison and H0 measurement
Cosmology with supernova Encore in the strong lensing cluster MACS J0138-2155: Lens model comparison and H0 measurement Open
MACS J0138-2155 is the only known cluster to strongly lens two supernovae (SNe), Requiem and Encore, from the same host galaxy at z=1.949. We present seven independent mass models of the galaxy cluster built using six software packages. By…
View article: Unveiling the Cosmic Gems Arc at <i>z</i> ∼ 10 with JWST NIRCam
Unveiling the Cosmic Gems Arc at <i>z</i> ∼ 10 with JWST NIRCam Open
We present recent JWST NIRCam imaging observations of SPT0615-JD (also known as the Cosmic Gems Arc), lensed by the galaxy cluster SPT-CL J0615−5746. The 5 ″ long arc is the most highly magnified z > 10 galaxy known. It straddles the lensi…
View article: A comprehensive separation of dark matter and baryonic mass components in galaxy clusters II: an overview of the mass distribution in Abell S1063
A comprehensive separation of dark matter and baryonic mass components in galaxy clusters II: an overview of the mass distribution in Abell S1063 Open
In the first paper of this series, we derived mass constraints on the total mass and the baryonic components of the galaxy cluster Abell S1063. The main focus was to recover stellar masses and kinematics for cluster members, the brightest …
View article: A comprehensive separation of dark matter and baryonic mass components in galaxy clusters I: Mass constraints from Abell S1063
A comprehensive separation of dark matter and baryonic mass components in galaxy clusters I: Mass constraints from Abell S1063 Open
In this two-part series, we present a multi-probe mass modelling method for massive galaxy clusters, designed to disentangle the contributions of individual mass components (Dark matter, intra-cluster gas, stellar masses). In this first pa…
View article: JWST’s PEARLS: A <i>z</i> ≃ 6 quasar in a train-wreck galaxy merger system
JWST’s PEARLS: A <i>z</i> ≃ 6 quasar in a train-wreck galaxy merger system Open
We present JWST NIRSpec integral field spectroscopy observations of the z = 5.89 quasar NDWFS J1425+3254 from 0.6–5.3 μm, covering the rest-frame ultraviolet and optical at a spectral resolution of R ∼ 100. The quasar has a black hole mass…
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: SLICE: SPT-CL J0546-5345—A Prominent Strong-lensing Cluster at <i>z</i> = 1.07
SLICE: SPT-CL J0546-5345—A Prominent Strong-lensing Cluster at <i>z</i> = 1.07 Open
Massive galaxy clusters act as prominent strong lenses. Due to a combination of observational biases, cluster evolution, and lensing efficiency, most of the known cluster lenses lie typically at z l ∼ 0.2–0.7, with only a few prominent exa…
View article: Cosmology with supernova Encore in the strong lensing cluster MACS J0138−2155
Cosmology with supernova Encore in the strong lensing cluster MACS J0138−2155 Open
The strongly lensed supernova (SN) Encore, at a redshift of z = 1.949 and discovered behind the galaxy cluster MACS J0138−2155 at z = 0.336, provides a rare opportunity for time-delay cosmography and studies of the SN host galaxy, where pr…
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 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: Signatures of fuzzy dark matter inside radial critical curves
Signatures of fuzzy dark matter inside radial critical curves Open
We investigated the strong gravitational lensing properties of fuzzy dark matter (FDM) haloes, focussing on the magnification properties near radial critical curves (CCs). Using simulated lenses, we computed magnification maps for a range …
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: The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters
The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters Open
The recent discovery of five massive stellar clusters at z=9.625 in the Cosmic Gems has raised the question about the formation mechanism of star clusters in the first half Gyr after the Big-Bang. We infer the total stellar mass in cluster…
View article: Constraining the <i>z</i> ∼ 1 Initial Mass Function with HST and JWST Lensed Stars in MACS J0416.1−2403
Constraining the <i>z</i> ∼ 1 Initial Mass Function with HST and JWST Lensed Stars in MACS J0416.1−2403 Open
Our understanding of galaxy properties and evolution is contingent on knowing the initial mass function (IMF), and yet to date the IMF is constrained only to local galaxies. Individual stars are now becoming routinely detected at cosmologi…
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…