Emiliano Merlin

EGS-z11-R0: a red, dust-rich galaxy at Cosmic Dawn

Giulia Rodighiero, Andrea Ferrara, Michele Catone +16

Context. Galaxies discovered by JWST at z > 10 are predominantly characterized by extremely blue rest-frame UV slopes. Conversely, the existence of dust-reddened systems at such ea…

ALMA Observation of a $z ≳ 10$ Galaxy Candidate Discovered with JWST

Ilsang Yoon, Christopher L. Carilli, Seiji Fujimoto +12

We report the ALMA observation of a $z ≳ 10$ galaxy candidate (GHZ1) discovered from the GLASS-JWST Early Release Science Program. Our ALMA program aims to detect the [OIII] em…

astro-ph.GA2017

Large Synoptic Survey Telescope Galaxies Science Roadmap

Brant E. Robertson, Manda Banerji, Michael C. Cooper +47

The Large Synoptic Survey Telescope (LSST) will enable revolutionary studies of galaxies, dark matter, and black holes over cosmic time. The LSST Galaxies Science Collaboration has…

Witnessing downsizing in the making: quiescent and breathing galaxies at the dawn of the Universe

Emiliano Merlin, Flaminia Fortuni, Antonello CalabrÃ² +18

[Shortened for arXiv] We conduct a systematic search for $lo g (M_{*} / M_{⊙}) \geq 9.5$ quiescent galaxies at $z > 3$ in six extragalactic deep fields observed with NIRCam, with t…

Early results from GLASS-JWST XVI: Discovering a bluer z~4-7 Universe through UV slopes

Themiya Nanayakkara, Karl Glazebrook, Colin Jacobs +20

We use the GLASS-JWST Early Release Science NIRCam parallel observations to provide a first view of the UV continuum properties of NIRCam/F444W selected galaxies at 4<z<7. By combi…

astro-ph.CO2012

The Origin of the Mass-Radius Relation of Early-Type Galaxies

Cesare Chiosi, Emiliano Merlin, Lorenzo Piovan

Early-type galaxies obey a narrow relation traced by their stellar content between the mass and size (Mass- Radius relation). The wealth of recently acquired observational data ess…

How galaxies acquire their stellar mass at high redshift: High star formation efficiencies and the relative roles of dust and initial mass function

Hao Fu, Francesco Shankar, Fabio Fontanot +9

JWST has measured an unprecedented abundance of galaxies above $z ≳ 4 - 5$ , whose formation and evolution are still difficult to reconcile within traditional galaxy evolution mo…

ULTIMATE-deblending I. A 50-band Ultraviolet to Mid-infrared Photometric Catalog Combining Space- and Ground-based Data in the JWST/PRIMER survey

Hanwen Sun, Tao Wang, Ke Xu +16

Our understanding of the early Universe has long been limited by biased galaxy samples selected through various color criteria. With deep JWST infrared imaging, mass-complete galax…

Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations

Jorge A. Zavala, Veronique Buat, Caitlin M. Casey +121

Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-…

astro-ph.IM2023

FORECAST: a flexible software to forward model cosmological hydrodynamical simulations mimicking real observations

Flaminia Fortuni, Emiliano Merlin, Adriano Fontana +7

We present FORECAST, a new flexible and adaptable software package that performs forward modeling of the output of any cosmological hydrodynamical simulations to create a wide rang…

The GLASS-JWST Early Release Science Program. II. Stage I release of NIRCam imaging and catalogs in the Abell 2744 region

Diego Paris, Emiliano Merlin, Adriano Fontana +27

We present images and a multi-wavelength photometric catalog based on all of the JWST NIRCam observations obtained to date in the region of the Abell 2744 galaxy cluster. These dat…

Early results from GLASS-JWST XIV: A first morphological atlas of the 1 < z < 5 Universe in the rest-frame optical

Colin Jacobs, Karl Glazebrook, Antonello CalabrÃ² +20

We present a rest-frame optical morphological analysis of galaxies observed with the NIRCam imager on the James Webb Space Telescope (JWST) as part of the GLASS-JWST Early Release…

The size-luminosity relation of lensed galaxies at $z = 6 - 9$ in the Hubble Frontier Fields

Lilan Yang, Nicha Leethochawalit, Tommaso Treu +8

We measure the size-luminosity relation of photometrically-selected galaxies within the redshift range $z \sim 6 - 9$ , using galaxies lensed by six foreground Hubble Frontier Fields (H…

Early results from GLASS-JWST. II: NIRCam extra-galactic imaging and photometric catalog

Emiliano Merlin, Andrea Bonchi, Diego Paris +26

We present the reduced images and multi-wavelength catalog of the first JWST NIRCam extra-galactic observations from the GLASS Early Release Science Program, obtained as coordinate…

Early results from GLASS-JWST. XX: Unveiling a population of "red-excess'' galaxies in Abell2744 and in the coeval field

Benedetta Vulcani, Tommaso Treu, Antonello Calabro +26

We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in different environmental conditions in the cluster Abell2744 ( $z = 0.3064$ ) and in its immed…

Mysteries of Capotauro: investigating the puzzling nature of an extreme F356W-dropout

Giovanni Gandolfi, Giulia Rodighiero, Marco Castellano +38

JWST has uncovered a diverse population of extreme near-infrared dropouts, including ultra high-redshift ( $z > 15$ ) galaxy candidates, dust-obscured galaxies challenging dust product…

The production of ionizing photons in UV-faint z~3-7 galaxies

Gonzalo Prieto-Lyon, Victoria Strait, Charlotte A. Mason +20

The demographics of the production and escape of ionizing photons from UV-faint early galaxies is a key unknown in discovering the primary drivers of reionization. With the advent…

The nature of an ultra-faint galaxy in the cosmic Dark Ages seen with JWST

Guido Roberts-Borsani, Tommaso Treu, Wenlei Chen +44

In the first billion years after the Big Bang, sources of ultraviolet (UV) photons are believed to have ionized intergalactic hydrogen, rendering the Universe transparent to UV rad…

astro-ph.GA2018

Mass and Light of Abell 370: A Strong and Weak Lensing Analysis

Victoria Strait, Marusa Bradac, Austin Hoag +13

We present a new gravitational lens model of the Hubble Frontier Fields cluster Abell 370 ( $z = 0.375$ ) using imaging and spectroscopy from Hubble Space Telescope and ground-based…

The clustering properties of high-redshift passive galaxies

Manuela Magliocchetti, Paola Santini, Emiliano Merlin +1

We investigate the clustering properties of 3<z<5 candidate passive galaxies from the Merlin et al. (2019) sample residing in the GOODS-North (35 sources) and GOODS-South (33 sourc…

Early results from GLASS-JWST. XXVII. The mass-metallicity relation in lensed field galaxies at cosmic noon with NIRISS

Xianlong He, Xin Wang, Tucker Jones +20

We present a measurement of the mass-metallicity relation (MZR) at cosmic noon, using the JWST near-infrared wide-field slitless spectroscopy obtained by the GLASS-JWST Early Relea…

Impact of stellar population models on the estimated physical properties of galaxies

Bozhidara Stoyanova, MÃ©dÃ©ric Boquien, Paola Santini +5

Accurate estimates of fundamental physical properties of galaxies, such as star formation rates (SFRs) or stellar masses, are essential for testing and constraining models of galax…

A massive interacting galaxy 510 million years after the Big Bang

Kristan Boyett, Michele Trenti, Nicha Leethochawalit +24

JWST observations confirm the existence of galaxies as early as 300Myr and at a higher number density than expected based on galaxy formation models and HST observations. Yet, sour…

A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ~ 12 Galaxy in Early JWST CEERS Imaging

Steven L. Finkelstein, Micaela B. Bagley, Pablo Arrabal Haro +117

We report the discovery of a candidate galaxy with a photo-z of z~12 in the first epoch of the JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative se…

astro-ph.IM2015

Improving resolution and depth of astronomical observations via modern mathematical methods for image analysis

Marco Castellano, Daniele Ottaviani, Adriano Fontana +3

In the past years modern mathematical methods for image analysis have led to a revolution in many fields, from computer vision to scientific imaging. However, some recently develop…

astro-ph.GA2016

The Grism Lens-Amplified Survey from Space (GLASS). VI. Comparing the Mass and Light in MACSJ0416.1-2403 using Frontier Field imaging and GLASS spectroscopy

Austin Hoag, Kuang-Han Huang, Tommaso Treu +12

We present a strong and weak gravitational lens model of the galaxy cluster MACSJ0416.1-2403, constrained using spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS)…

Possible Ongoing Merger Discovered by Photometry and Spectroscopy in the Field of the Galaxy Cluster PLCK G165.7+67.0

Massimo Pascale, Brenda L. Frye, Liang Dai +17

We present a detailed study of the Planck-selected binary galaxy cluster PLCK G165.7+67.0 (G165; $z$ =0.348). A multiband photometric catalog is generated that incorporates new imag…

astro-ph.CO2012

Formation and Evolution of Early-Type Galaxies. III Star formation history as a function of mass and over-density

Emiliano Merlin, Cesare Chiosi, Lorenzo Piovan +3

We investigate the influence of the initial proto-galaxies over-densities and masses on their evolution, to understand whether the internal properties of the proto-galactic haloes…

First Light And Reionisation Epoch Simulations (FLARES) VIII. The Emergence of Passive Galaxies at $z ⩾ 5$

Christopher C. Lovell, Will Roper, Aswin P. Vijayan +9

Passive galaxies are ubiquitous in the local universe, and various physical channels have been proposed that lead to this passivity. To date, robust passive galaxy candidates have…

Early Results from GLASS-JWST. XIX: A High Density of Bright Galaxies at $z \approx 10$ in the Abell 2744 Region

Marco Castellano, Adriano Fontana, Tommaso Treu +38

We report the detection of a high density of redshift $z \approx 10$ galaxies behind the foreground cluster Abell 2744, selected from imaging data obtained recently with NIRCam onbo…

Early Results from GLASS-JWST. XXI: Rapid assembly of a galaxy at z=6.23 revealed by its C/O abundance

Tucker Jones, Ryan Sanders, Yuguang Chen +21

The abundance of carbon relative to oxygen (C/O) is a promising probe of star formation history in the early universe, as the ratio changes with time due to production of these ele…

Early results from GLASS-JWST. XIV: A spectroscopically confirmed protocluster 650 million years after the Big Bang

Takahiro Morishita, Guido Roberts-Borsani, Tommaso Treu +39

We present the spectroscopic confirmation of a protocluster at $z = 7.88$ behind the galaxy cluster Abell2744 (hereafter A2744-z7p9OD). Using JWST NIRSpec, we find seven galaxies wit…

astro-ph.GA2016

The Evolution of the Galaxy Stellar Mass Function at z= 4-8: A Steepening Low-mass-end Slope with Increasing Redshift

Mimi Song, Steven L. Finkelstein, Matthew L. N. Ashby +16

We present galaxy stellar mass functions (GSMFs) at $z =$ 4-8 from a rest-frame ultraviolet (UV) selected sample of $\sim$ 4500 galaxies, found via photometric redshifts over an area…

Evidence of extreme ionization conditions and low metallicity in GHZ2/GLASS-z12 from a combined analysis of NIRSpec and MIRI observations

Antonello Calabro, Marco Castellano, Jorge A. Zavala +19

GHZ2/GLASS-z12 has been recently observed by JWST with both NIRSpec and MIRI spectrographs, making it the most distant galaxy ( $z_{s p ec} = 12.34$ ) with complete spectroscopic coverag…

Early Results from GLASS-JWST XXIII: The transmission of Lyman-alpha from UV-faint z ~ 3-6 galaxies

Gonzalo Prieto-Lyon, Charlotte Mason, Sara Mascia +18

Lyman-alpha (Ly $I^\pm$ ) emission from galaxies can be used to trace neutral hydrogen in the epoch of reionization, however, there is a degeneracy between the attenuation of Ly $I^\pm$ in…

Cosmic Evolution Early Release Science (CEERS) survey: The colour evolution of galaxies in the distant Universe

Stephen M. Wilkins, Jack C. Turner, Micaela B. Bagley +20

The wavelength-coverage and sensitivity of JWST now enables us to probe the rest-frame UV - optical spectral energy distributions (SEDs) of galaxies at high-redshift ( $z > 4$ ). From…

astro-ph.GA2017

The Star Formation Main Sequence in the Hubble Space Telescope Frontier Fields

Paola Santini, Adriano Fontana, Marco Castellano +13

We investigate the relation between the star formation rate (SFR) and the stellar mass (M), i.e. the Main Sequence (MS) relation of star-forming galaxies, at 1.3<=z<6 in the first…

astro-ph.CO2009

EvoL: The new Padova T-SPH parallel code for cosmological simulations - I. Basic code: gravity and hydrodynamics

Emiliano Merlin, Umberto Buonomo, Tommaso Grassi +2

We present EvoL, the new release of the Padova N-body code for cosmological simulations of galaxy formation and evolution. In this paper, the basic Tree + SPH code is presented and…

astro-ph.GA2016

Spitzer UltRa Faint SUrvey Program (SURFS UP). II. IRAC-Detected Lyman-Break Galaxies at 6 < z < 10 Behind Strong-Lensing Clusters

Kuang-Han Huang, MaruÅ¡a BradaÄ, Brian C. Lemaux +15

We study the stellar population properties of the IRAC-detected $6 ≲ z ≲ 10$ galaxy candidates from the Spitzer UltRa Faint SUrvey Program (SURFS UP). Using the Lyman…

astro-ph.GA2020

The parallelism between galaxy clusters and early-type galaxies: III. The Mass-Radius Relationship

Cesare Chiosi, Mauro D'Onofrio, Emiliano Merlin +2

Context. This is the third study of a series dedicated to the observed parallelism of properties between Galaxy Clusters and Groups(GCGs) and early-type galaxies (ETGs). Aims. Here…

astro-ph.GA2019

Hubble Frontier Field Photometric Catalogues of Abell 370 and RXC J2248.7-4431: Multiwavelength photometry, photometric redshifts, and stellar properties

Marusa Bradac, Kuang-Han Huang, Marco Castellano +15

This paper presents multiwavelength photometric catalogues of the last two Hubble Frontier Fields (HFF), the massive galaxy clusters Abell 370 and RXC J2248.7-4431. The photometry…

The Cosmic Evolution Early Release Science Survey (CEERS)

Steven L. Finkelstein, Micaela B. Bagley, Pablo Arrabal Haro +96

We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hour Director's Discretionary Early Release Science Program. CEERS demonstrates, tests, and validates e…

astro-ph.GA2015

The Evolution of the Galaxy Rest-Frame Ultraviolet Luminosity Function Over the First Two Billion Years

Steven L. Finkelstein, Russell E. Ryan, Casey Papovich +26

We present a robust measurement and analysis of the rest-frame ultraviolet (UV) luminosity function at z=4-8. We use deep Hubble Space Telescope imaging over the CANDELS/GOODS fiel…

astro-ph2006

Formation and evolution of early-type galaxies. II. Models with quasi-cosmological initial conditions

Emiliano Merlin, Cesare Chiosi

In this study, with the aid of N-Body simulations based on quasi-cosmological initial conditions, we have followed the formation and evolution of two models of early-type galaxies,…

astro-ph.GA2019

Photometry of high-redshift blended galaxies using deep learning

Alexandre Boucaud, Marc Huertas-Company, Caroline Heneka +11

The new generation of deep photometric surveys requires unprecedentedly precise shape and photometry measurements of billions of galaxies to achieve their main science goals. At su…

Early Results from GLASS-JWST. I: Confirmation of Lensed $z ⩾ 7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS

Guido Roberts-Borsani, Takahiro Morishita, Tommaso Treu +29

We present the first search for $z ⩾ 7$ , continuum-confirmed sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST ERS s…

The Dual Nature of GHZ9: Coexisting Active Galactic Nuclei and Star Formation Activity in a Remote X-ray Source at z = 10.145

Lorenzo Napolitano, Marco Castellano, Laura Pentericci +33

We present James Webb Space Telescope (JWST)/NIRSpec PRISM spectroscopic characterization of GHZ9 at z= 10.145 $\pm$ 0.010, currently the most distant source detected by the Chandr…

JWST NIRSpec Spectroscopy of the Remarkable Bright Galaxy GHZ2/GLASS-z12 at Redshift 12.34

Marco Castellano, Lorenzo Napolitano, Adriano Fontana +28

We spectroscopically confirm the $M_{UV} = - 20.5$ mag galaxy GHZ2/GLASS-z12 to be at redshift $z = 12.34$ . The source was selected via NIRCam photometry in GLASS-JWST ERS data, p…