R. Ragusa

Euclid Quick Data Release (Q1). Exploring the complexity of quenching processes across time, environment, and mass through recently quenched galaxies

Euclid Collaboration, Z. Mao, L. Pozzetti +308

Recently quenched galaxies (RQGs) provide insights into galaxy quenching. We present a photometric and spectroscopic analysis of RQGs using the first Euclid Quick Data Release (Q1)…

Rubin LSST DP2 unveils almost-dark galaxies in the Virgo Cluster

Minh Ngoc Le, Johan H. Knapen, Željko Ivezić +27

Galaxies with the faintest surface brightness are currently known only in the Local Group. Similar objects should exist beyond our vicinity and are crucial for understanding galaxy…

Rubin J122659.4+090236: An Extremely Low Surface Brightness Galaxy Candidate Discovered in the Rubin LSST Early Data Preview 2

Dipanjan Mitra, Kanak Saha, Sugata Kaviraj +28

We report the serendipitous discovery of an exceptionally low surface brightness galaxy (LSBG) candidate, Rubin J122659.4+090236, in Rubin Observatory imaging of the interacting NG…

VST-SMASH: VST Survey of Mass Assembly and Structural Hierarchy II. Exploring dwarf galaxies in the vicinity of NGC 5068 and of the two galaxies NGC 5084 and NGC 5087 at the edges of the Virgo Supercluster

C. Tortora, R. Ragusa, L. K. Hunt +9

We present a study of dwarf galaxy candidates in the deepest optical imaging yet obtained of the field surrounding the nearby galaxies NGC 5068 and NGC 5084/NGC 5087, the latter tw…

A New Perspective on Galactic Evolution: Studying the Outskirts of the Abell S1063 Galaxy Cluster

L. Pecoraro, A. Mercurio, M. Annunziatella +14

Galaxy physical properties are influenced by their environments, but the processes responsible for mass and environmental quenching and structural transformations remain debated. G…

astro-ph.GA2026★ 1 cited

VST-SMASH: VST Survey of Mass Assembly and Structural Hierarchy I. Survey presentation and deep photometry of IC 5332: tracing the mass assembly in the challenging faintest-end regime

R. Ragusa, C. Tortora, L. Hunt +9

Understanding the formation and evolution of late type galaxies (LTG) requires deep imaging for tracing the faintest stellar components in their outskirts. Despite their crucial ro…

Euclid: Early Release Observations -- The extended stellar component of the IC10 dwarf galaxy

F. Annibali, A. M. N. Ferguson, P. M. Sanchez-Alarcon +175

We present a detailed analysis of the old, extended stellar component of the Local Group dwarf galaxy IC 10 using deep resolved-star photometry in the VIS and NISP bands of the Euc…

astro-ph.IM2025

Unlocking the physics of dwarf galaxies in the 2040s: The case for a next-generation wide-field spectroscopic facility with fibres and IFUs

Crescenzo Tortora, Daniela Carollo, Leslie Hunt +25

Dwarf galaxies ( $M_{⋆} ≲ 1 0^{9} M_{⊙}$ ) are the most numerous galaxies in the Universe and critical probes of dark matter, baryonic feedback, and galaxy formation. D…

Euclid preparation: LXXXI. The impact of nonparametric star formation histories on spatially resolved galaxy property estimation using synthetic Euclid images

Euclid Collaboration, A. Nersesian, Abdurro'uf +283

We analyzed the spatially resolved and global star formation histories (SFHs) for a sample of 25 TNG50-SKIRT Atlas galaxies to assess the feasibility of reconstructing accurate SFH…

statmorph-lsst: Quantifying and correcting morphological biases in galaxy surveys

Elizaveta Sazonova, Cameron R. Morgan, Michael Balogh +16

Quantitative morphology provides a key probe of galaxy evolution across cosmic time and environments. However, these metrics can be biased by changes in imaging quality - resolutio…

Stellar halos of bright central galaxies II: Scaling relations, colors and metallicity evolution with redshift

Emanuele Contini, Marilena Spavone, Rossella Ragusa +2

We study the formation and evolution of stellar halos (SHs) around bright central galaxies (BCGs), focusing on their scaling relations, colors, and metallicities across cosmic time…

Using Deep Learning Methods to Detect for Ultra-diffuse Galaxies in KiDS

Hao Su, Rui Li, Nicola R. Napolitano +13

Ultra-diffuse Galaxies (UDGs) are a subset of Low Surface Brightness Galaxies (LSBGs), showing mean effective surface brightness fainter than $24 mag arcse c^{- 2}$ and a d…

Euclid preparation LXXIX. Using mock low surface brightness dwarf galaxies to probe Euclid Wide Survey detection capabilities

Euclid Collaboration, M. Urbano, P. -A. Duc +313

Local Universe dwarf galaxies can serve as both cosmological and mass assembly probes. Deep surveys have enabled the study of these objects down to the low surface brightness (LSB)…

From simulations to observations. Methodology and data release of mock TNG50 galaxies at 0.3 < z < 0.7 for WEAVE-StePS

A. Ikhsanova, L. Costantin, A. Pizzella +17

The new generation of optical spectrographs (i.e., WEAVE, 4MOST, DESI, and WST) offer unprecedented opportunities for statistically studying the star formation histories of galaxie…

Galaxies at the edges: a complete census of MACS J0416.1-2403 cluster

Rossella Ragusa, Maurizio D'Addona, Amata Mercurio +20

Numerous studies have established that the environment influences the physical properties of a galaxy. While gas inflows supply the fuel for SF, high density and temperature condit…

astro-ph.GA2025★ 7 cited

Intra-Cluster Light as a Dynamical Clock for Galaxy Clusters: Insights from the MAGNETICUM, IllustrisTNG, Hydrangea and Horizon-AGN Simulations

Lucas C. Kimmig, Sarah Brough, Klaus Dolag +19

As the most massive nodes of the cosmic web, galaxy clusters represent the best probes of structure formation. Over time, they grow by accreting and disrupting satellite galaxies,…

astro-ph.GA2025★ 2 cited

Euclid: Quick Data Release (Q1) -- A census of dwarf galaxies across a range of distances and environments

F. R. Marleau, R. Habas, D. Carollo +204

The Euclid Q1 fields were selected for calibration purposes in cosmology and are therefore relatively devoid of nearby galaxies. However, this is precisely what makes them interest…

astro-ph.GA2025★ 8 cited

Euclid: Early Release Observations -- The Intracluster Light of Abell 2390

A. Ellien, M. Montes, S. L. Ahad +183

Intracluster light (ICL) provides a record of the dynamical interactions undergone by clusters, giving clues on cluster formation and evolution. Here, we analyse the properties of…

astro-ph.GA2025★ 4 cited

Euclid preparation. Spatially resolved stellar populations of local galaxies with Euclid: a proof of concept using synthetic images with the TNG50 simulation

Euclid Collaboration, Abdurro'uf, C. Tortora +286

The European Space Agency's Euclid mission will observe approximately 14,000 $deg^{2}$ of the extragalactic sky and deliver high-quality imaging for many galaxies. The depth a…

Euclid Quick Data Release (Q1). Exploring galaxy morphology across cosmic time through Sersic fits

Euclid Collaboration, L. Quilley, I. Damjanov +333

We present the results of the single-component Sérsic profile fitting for the magnitude-limited sample of \IE $< 23$ galaxies within the 63.1 deg $^{2}$ area of the Euclid Quick Data Re…