G. Sarrouh

A Systematic Assessment of Total Stellar Mass Measurements with Spatially Resolved Photometry and Medium Bands at 1 < z < 9: The Impact of Mass-to-Light Variations and Outshining

Naadiyah Jagga, Adam Muzzin, Visal Sok +17

JWST NIRCam spatially resolved photometry enables studies of galaxies' stellar populations and stellar masses on sub-kpc scales. We use JWST (CANUCS, Technicolor, JUMPS) and HST da…

Early steps in the hierarchical assembly of a Milky Way-mass galaxy 1 Gyr after the Big Bang

Yoshihisa Asada, Marcin Sawicki, Guillaume Desprez +14

We report JWST observations of a $z_{spec} = 5.196$ compact group of three strongly lensed low-mass galaxies ( $M_{⋆} \sim 1 0^{6 - 7} M_{⊙}$ each) whose small line-of-sight velo…

A New Window on the Hα Luminosity Function and Star Formation Rate Density from 1.2 < z < 6.6 from JWST Medium-Band Photometry

Nicholas S. Martis, Chris Willott, Gregor Rihtaršič +23

We present the first self-consistent measurement of the Hα luminosity function over a wide redshift range, covering cosmic noon into the epoch of reionization. Our analysis utilize…

Interaction-induced star formation boosts stellar mass assembly in $z \sim 5$ galaxies

Kiyoaki C. Omori, Marcin Sawicki, Rosa M. Mérida +10

Galaxy interactions are a key ingredient in galaxy evolution; not only are they a primary pathway of galaxy growth and mass assembly, but also a key driver of processes such as sta…

Resolved Ages and Stellar Metallicities in Progenitors of Milky Way Analogs: A Closer Look at their Star Formation Histories since $z = 5$

Vivian Yun Yan Tan, Adam Muzzin, Naadiyah Jagga +12

We present the evolution of the resolved mass-weighted age, stellar metallicity, and sSFR of 872 Milky Way Analog (MWA) progenitors up to redshift $z = 5$ from the Canadian Unbiased…

CANUCS/Technicolor Data Release 2: A Catalogue of Galaxy Structural Parameters in up to 29 HST+JWST bands and a Multi-Wavelength Exploration of the Galaxy Size-Mass Relation at $0.6 < z \leq 4$

Maya Merchant, Lamiya A. Mowla, Georgios E. Magdis +23

We present James Webb Space Telescope (JWST) results of a morphological study of galaxies in the CAnadian NIRISS Unbiased Cluster (CANUCS) and Technicolor surveys, observed in 19 m…

A Population of Red Galaxies with Very Strong Emission Lines at $z > 5$ Revealed by the NIRCam Medium Bands: ''Classic'' LRDs, Dusty Star-Forming Galaxies, and a Missing Population of LRDs

Sunna Withers, Adam Muzzin, Swara Ravindranath +16

The NIRCam medium-bands have proven to be efficient at identifying Emission Line Galaxies (ELGs) with high equivalent width (EW) H $α$ and [OIII]+H $β$ emission lines. In this paper…

Metal-Poor Gas Accretion Drives Giant Clump Formation at 0.6 < z < 2.6

Visal Sok, Adam Muzzin, Ben Forrest +20

The physical properties of kiloparsec-scale clumps in high-redshift star-forming galaxies (SFGs) contain crucial constraints on how they assemble. Building on recent work that indi…

Toward Unbreaking the Universe: MINERVA Measurements of Color Gradients in Massive Quiescent Galaxies Can Help Ease Too-Early Star Formation Tensions

Sam E. Cutler, Luke Robbins, Danilo Marchesini +41

The discovery of a population of massive, ancient quiescent galaxies within the first 2 Gyr of the Universe's history has led to significant tensions with models of galaxy formatio…

Two Exciting High-redshift Galaxy Candidates Turn Out to Be Two Exciting Ultra-cool Brown Dwarfs

Maruša Bradač, Chris Willott, Yoshihisa Asada +37

From the onset of observations of JWST we have discovered unexpectedly luminous galaxies at redshifts $z > 10$ and as high as $z = 14$ . With their discovery, the question immediately f…

UV slopes of Starforming Galaxies in Strong Lensing fields at the Epoch of Reionization with JWST

Giordano Felicioni, Maruša Bradač, Yoshihisa Asada +20

UV slopes ( $β$ ) are a powerful diagnostics for galaxies at the Epoch of Reionization, tracing star formation, ISM ionization, and the escape fraction $f_{esc}$ of ionizing photons.…

An Ancient Descendant of the First Galaxies

Jacqueline Antwi-Danso, Adam Muzzin, Luke Robbins +18

JWST has revealed unexpectedly bright galaxies in the first 500 Myr after the Big Bang. Their overabundance suggests that they are preferentially observed during burst phases, wher…

Resolving dust and Lyα emission in a lensed galaxy at the epoch of reionization with JWST/CANUCS

V. Markov, M. Bradač, V. Estrada-Carpenter +20

Lyman $α$ emission is highly sensitive to dust and neutral hydrogen and is therefore expected to be strongly suppressed in dusty or gas-rich galaxies during the epoch of reionizati…

The rise and fall of Little Red Dots could be driven by the environment

Rosa M. Mérida, Gaia Gaspar, Yoshihisa Asada +9

The Little Red Dot (LRD) paradigm comprises three main unknowns that are intrinsically connected: (1) What is the nature of these sources? (2) How do they form? (3) How do they evo…

The Stellar Mass and Age Distributions of Star-Forming Clumps at $0.5 < z < 5$ in JWST CANUCS: Implications for Clump Formation and Destruction

Visal Sok, Adam Muzzin, Vivian Yun Yan Tan +12

We investigate the resolved properties of star-forming clumps and their host galaxies at $0.5 < z < 5$ in the JWST CANUCS fields. We find that the fraction of clumpy galaxies peaks nea…

JWST Photometry of Globular Cluster Populations in MACS0417.5-1154

William E. Harris, Marta Reina-Campos, Kaitlyn E. Keatley +8

Deep JWST imaging of the massive galaxy cluster MACS0417.5-1154, at redshift z=0.443, reveals a huge population of globular clusters (GCs) and Ultra-Compact Dwarfs (UCDs) primarily…

astro-ph.GA2025★ 5 cited

Probing the Star Formation Main Sequence down to 10 $^{7} M_{⊙}$ at $1 < z < 9$

Rosa M. Mérida, Marcin Sawicki, Kartheik G. Iyer +12

The Main Sequence of Star-Forming Galaxies (SFGMS or MS) is a fundamental scaling relation that provides a global framework for studying galaxy formation and evolution, as well as…

astro-ph.GA2025★ 2 cited

Star Formation under a Cosmic Microscope: Highly magnified z = 11 galaxy behind the Bullet Cluster

Maruša Bradač, Jon Judež, Chris Willott +20

We present measurements of stellar population properties of a newly discovered spectroscopically confirmed $z = 11.1 0_{- 0.26}^{+ 0.11}$ , gravitationally lensed galaxy, using JWST NIRS…

Metal-Poor Star-Forming Clumps in Cosmic Noon Galaxies: Evidence for Gas Inflow and Chemical Dilution Using JWST NIRISS

Vicente Estrada-Carpenter, Marcin Sawicki, Roberto Abraham +16

The formation and evolution of galaxies are intricately linked to the baryon cycle, which fuels star formation while shaping chemical abundances within galaxies. Investigating the…

astro-ph.GA2025★ 2 cited

MINERVA: A NIRCam Medium Band and MIRI Imaging Survey to Unlock the Hidden Gems of the Distant Universe

Adam Muzzin, Katherine A. Suess, Danilo Marchesini +81

We present an overview of the MINERVA survey, a 259.8 hour (prime) and 127 hour (parallel) Cycle 4 treasury program on the James Webb Space Telescope (JWST). MINERVA is obtaining 8…

A deep dive down the broad-line region: permitted OI, CaII and FeII emission in an AGN Little Red Dot at z=5.3

Roberta Tripodi, Maruša Bradač, Francesco D'Eugenio +27

We present a spectroscopic analysis of a broad-line active galactic nucleus (AGN) selected as little red dot at $z = 5.3$ behind the Bullet cluster (Bz5.3), based on JWST/NIRCam an…

Earliest Galaxy Evolution in the CANUCS+Technicolor fields: Galaxy Properties at $z \sim 10 - 16$ seen with the Full NIRCam Medium and Broad Band Filters

Yoshihisa Asada, Chris Willott, Adam Muzzin +18

We present a sample of $z_{phot} \sim 10 - 16$ galaxies by exploiting one of the richest JWST NIRCam imaging data, taken in the CANUCS survey in Cycle 1 and the Technicolor (TEC) s…

CANUCS/Technicolor Data Release 1: Imaging, Photometry, Slit Spectroscopy, and Stellar Population Parameters

Ghassan T. E. Sarrouh, Yoshihisa Asada, Nicholas S. Martis +44

We present the first data release of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS), a JWST Cycle 1 GTO program targeting 5 lensing clusters and flanking fields in parallel (…