G. Mahler

The BUFFALO Survey : The Subhalo Mass Function for Abell 2744 with Strong+Weak Gravitational Lensing

Nency R. Patel, Mathilde Jauzac, Anna Niemiec +16

We present a combined strong and weak gravitational lensing mass model of the massive merging galaxy cluster Abell 2744 (z = 0.308). The mass reconstruction combines strong-lensing…

Sub-kiloparsec Test of the Kennicutt-Schmidt Relation in a Strongly Lensed Dusty Star-Forming Galaxy at z~2.78

C. Cornil-Baïotto, J. Molina, G. Mahler +9

[abridged] Star formation is a key process driving galaxy evolution, but understanding how it proceeds within the interstellar medium (ISM) requires resolving cold molecular gas an…

SLICE: Unveiling the Multi-Component Merging Core of SPT-CLJ1150-2805 Through Strong-Lensing Mass Modelling

James R. Betts, Benjamin Beauchesne, Mathilde Jauzac +16

We present a new strong-lensing and X-ray mass model of the merging galaxy cluster SPT-CLJ1150-2805 ( $z = 0.383$ ), combining JWST NIRCam, HST, Chandra, and VLT/MUSE data to robustly…

SN Helios: A Multiply Imaged Type II Supernova Opening Time-Delay Cosmography beyond redshift of 3

Seiji Fujimoto, Conor Larison, Justin D. R. Pierel +64

We report the discovery and spectroscopic confirmation of SN Helios, a strongly lensed, multiply imaged Type II supernova (SN) at $z = 3.34$ behind the galaxy cluster RXC J0018.5+162…

Intracluster light in the infall region of simulated protoclusters of galaxies

S. V. Werner, M. Jauzac, M. Montes +4

Intracluster light (ICL) is a diffuse stellar component in galaxy clusters, made of stars following the potential of the cluster. Despite its potential to unveil the accretion hist…

Resolving 3 Exotic Hyperbolic-Umbilic Lensing Configurations in the "Cosmic Mantis": An Exploration of RXJ0437.1+0043 with JWST

Catherine Cerny, David J. Lagattuta, Keren Sharon +12

We present an updated strong lensing model for the galaxy cluster RXJ0437.1+0043 (z=0.285) using new JWST NIRCam imaging in four pass-bands. The cluster field notably displays at l…

Imprints of Mass Accretion History on Galaxy Cluster Morphology

Kabelo Tsiane, Camille Avestruz, Elena Rasia +6

Variations in dynamical states of galaxy clusters can introduce biases and scatter in observable-mass relations. The dynamical state of a cluster is an emergent feature of its mass…

LEGGOS I: The JWST LEGGOS Survey -- LEnsing and Galaxy Growth: Observing Substructures -- Unpacks the Nature of Clumpy Star Formation and Quenching in Gravitationally Lensed Galaxies beyond Cosmic Noon

Gourav Khullar, Michael Florian, Matthew B. Bayliss +34

We present first results from the JWST LEGGOS Survey (LEnsing and Galaxy Growth: Observing Substructures), aimed at studying the physics of clumpy star formation and quenching in e…

Galaxy Clusters Selected via the Sunyaev-Zel'dovich Effect in 5 year data from the SPT-3G Main Survey

L. E. Bleem, M. Klein, K. Kornoelje +148

We report a new galaxy cluster catalog, selected using the thermal Sunyaev-Zel'dovich (SZ) effect, from 5 years of observations of the SPT-3G Main field. Drawn from arcminute-resol…

LEGGOS II: A Strong Lens Model and Source-Plane Projection of the Clumpy Star-Forming Galaxy SGASJ111020.0+645950.8 at z=2.48

Pedram Abedi, Keren Sharon, Taylor A. Hutchison +18

Strong gravitational lensing by galaxy clusters combined with the resolution of JWST enables studies of star formation on ~10-100 pc scales in galaxies at z~2-4. As part of the LEn…

LEGGOS III: Mapping Star Formation and Dust in Gravitationally Lensed Galaxies with $SUMAC$ , a UMAP and Clustering Framework

Alex Ross, Gourav Khullar, Taylor Hutchison +10

Strong gravitational lensing combined with JWST's spatio-spectral resolution enables resolved studies of star-forming regions in $z \sim$ 2-4 galaxies, but identifying and character…

COOL-LAMPS IX: A Rare Duo of Quasars Each Lensed by a Single Massive Galaxy Cluster

Erik Solhaug, Michael D. Gladders, Andi M. Kisare +20

Wide-separation lensed quasars (WSLQs) are rare systems that arise from the chance alignment of two objects: a galaxy cluster and a background quasar. After two decades, only seven…

SN 2022riv in RX J2129: Discovery, Spectroscopic Classification, and Microlensing of a Strongly Lensed Type Ia Supernova from JWST and HST Observations

Birendra Dhanasingham, Patrick L. Kelly, Wenlei Chen +27

The multiply imaged SN 2022riv was discovered through a search of galaxy cluster fields as part of a Hubble Space Telescope (HST) SNAP program to find highly magnified stars. The s…

A Kiloparsec-Scale Stellar Cavity in the Center of Abell402-BCG May be Caused by Dynamic Interactions with an Ultramassive Black Hole

Michael McDonald, Gourav Khullar, David Lagattuta +18

We present new observations from JWST NIRCam that reveal a striking kpc-wide cavity in the stellar distribution of the central galaxy in the cluster Abell402. Supporting data from…

astro-ph.CO2026★ 4 cited

An ultra-high-resolution map of (dark) matter

Diana Scognamiglio, Gavin Leroy, David Harvey +38

Ordinary matter-including particles such as protons and neutrons-accounts for only about one sixth of all matter in the Universe. The rest is dark matter, which does not emit or ab…

A shot in the dark: searching for dark substructures in the RX J0437+00 galaxy cluster

David J. Lagattuta, Mathilde Jauzac, Jessica E. Doppel +2

Obtaining a census of dark matter structures at low mass ( $\leq 1 0^{9} M_{⊙}$ ) can provide strong constraints on the nature of dark matter, though identifying such structures remai…

astro-ph.GA2025★ 1 cited

Little red dot variability over a century reveals black hole envelope via a giant Einstein cross

Zijian Zhang, Mingyu Li, Masamune Oguri +79

"Little red dots" (LRDs) represent a new population of astronomical objects uncovered by JWST whose nature remains debated. Although many LRDs are suspected as active galactic nucl…

SLICE -- Combining Strong Lensing and X-ray in AC 114. Further Insights into the Merger Scenario

Marceau Limousin, Benjamin Beauchesne, Keren Sharon +14

AC114 is a historically significant galaxy cluster, being one of the first strong lensing clusters detected from the ground in the early 1990s, prior to the launch of the HST. Desp…

astro-ph.GA2025★ 1 cited

JWST & the Waz Arc I: Spatially Resolving the Physical Conditions within a Post-Starburst Galaxy at Redshift 5 with NIRSpec IFS

Taylor A. Hutchison, Gourav Khullar, Jane R. Rigby +22

We present NIRSpec/IFS observations of a rest-frame UV-bright, massive ( $M_{*} \sim 1 0^{10}$ M $_{⊙}$ , $z_{A B} = 20.5$ ) galaxy highly magnified by gravitational-lensing observed just…

Tracing Structure: Shape and Centroid Deviations in 39 Strong Lensing Clusters as a Test of Cluster Formation Predictions

Raven Gassis, Matthew B. Bayliss, Keren Sharon +10

Strong lensing galaxy clusters provide a unique and powerful way to test simulation-derived structure predictions that follow from $Λ$ Cold Dark Matter ( $Λ$ CDM) cosmology. Specific…

The Chandra Strong Lens Sample: Measuring the Dynamical States and Relaxation Fraction of a Sample of 28 Strong Lensing Selected Galaxy Clusters

Raven Gassis, Matthew B. Bayliss, Michael McDonald +10

We present the results of our dynamical state proxy measurements performed on 28 strong lensing galaxy clusters from the Sloan Giant Arcs Survey (SGAS). Using Chandra ACIS-I/S X-ra…