Viola Gelli
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View article: Neutral hydrogen in and around galaxies during the Epoch of Reionization
Neutral hydrogen in and around galaxies during the Epoch of Reionization Open
JWST spectra revealing Lyman-$α$ (Ly$α$) absorption in $z\sim 5-14$ galaxies offer a unique probe of reionization's earliest stages. However, disentangling absorption by the increasingly neutral intergalactic medium (IGM) from that in gala…
View article: The JWST Spectroscopic Properties of Galaxies at $z=9-14$
The JWST Spectroscopic Properties of Galaxies at $z=9-14$ Open
We characterize the JWST spectra of $61$ galaxies at $z=9-14$, including $30$ newly-confirmed galaxies. We directly compare the $z>9$ spectroscopic properties against $401$ galaxies at $69$ galaxies. Our dataset indicates that the emission…
View article: Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H <i>α</i> and [O III] emitters
Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H <i>α</i> and [O III] emitters Open
We have developed a theoretical framework that provides observational constraints on the early Universe galaxy-halo connection by combining measurements of the ultraviolet luminosity function (UVLF) and galaxy clustering via the two-point …
View article: Temporarily Quiescent Galaxies at Cosmic Dawn: Probing Bursty Star Formation
Temporarily Quiescent Galaxies at Cosmic Dawn: Probing Bursty Star Formation Open
The bursty, time-variable nature of star formation in the first billion years, as revealed by JWST, drives phases of temporary quiescence in low-mass galaxies that quench after starbursts. These galaxies provide unique probes of the bursti…
View article: BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results
BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results Open
We introduce the Bias-free Extragalactic Analysis for Cosmic Origins with NIRCam (BEACON) survey, a JWST Cycle 2 program allocated up to 600 pure-parallel hours of observations. BEACON explores high-latitude areas of the sky with JWST/NIRC…
View article: Temporarily quiescent galaxies at cosmic dawn: probing bursty star formation
Temporarily quiescent galaxies at cosmic dawn: probing bursty star formation Open
The bursty, time-variable nature of star formation in the first billion years, as revealed by JWST, drives phases of temporary quiescence in low-mass galaxies that quench after starbursts. These galaxies provide unique probes of the bursti…
View article: BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results
BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results Open
We introduce the Bias-free Extragalactic Analysis for Cosmic Origins with NIRCam (BEACON) survey, a JWST Cycle2 program allocated up to 600 pure-parallel hours of observations. BEACON explores high-latitude areas of the sky with JWST/NIRCa…
View article: The Impact of Mass-dependent Stochasticity at Cosmic Dawn
The Impact of Mass-dependent Stochasticity at Cosmic Dawn Open
The James Webb Space Telescope is unveiling a surprising lack of evolution in the number densities of ultraviolet (UV)-selected galaxies at redshift z ≳ 10. At the same time, observations and simulations are providing evidence for highly b…
View article: The JWST-PRIMAL archival survey
The JWST-PRIMAL archival survey Open
Context. One of the surprising early findings with JWST has been the discovery of a strong “roll-over” or a softening of the absorption edge of Ly α in a large number of galaxies at z ≳ 6, in addition to systematic offsets from photometric…
View article: Linking High-z and Low-z: Are We Observing the Progenitors of the Milky Way with JWST?
Linking High-z and Low-z: Are We Observing the Progenitors of the Milky Way with JWST? Open
The recent JWST observation of the Firefly Sparkle at z = 8.3 offers a unique opportunity to link the high- and the low- z Universe. Indeed, the claim of it being a Milky Way (MW) type of assembly at the cosmic dawn opens the possibility o…
View article: Gas-phase metallicity gradients in galaxies at <i>z</i> ∼ 6–8
Gas-phase metallicity gradients in galaxies at <i>z</i> ∼ 6–8 Open
The study of gas-phase metallicity and its spatial distribution at high redshift is crucial to understand the processes that shaped the growth and evolution of galaxies in the early Universe. Here we study the spatially resolved metallicit…
View article: Linking high-z and low-z: Are We Observing the Progenitors of the Milky Way with JWST?
Linking high-z and low-z: Are We Observing the Progenitors of the Milky Way with JWST? Open
The recent JWST observation of the Firefly Sparkle at $z=8.3$ offers a unique opportunity to link the high- and the low-$z$ Universe. Indeed, the claim of it being a Milky Way (MW) type of assembly at the cosmic dawn opens the possibility …
View article: The impact of mass-dependent stochasticity at cosmic dawn
The impact of mass-dependent stochasticity at cosmic dawn Open
JWST is unveiling a surprising lack of evolution in the number densities of ultraviolet-selected (UV) galaxies at redshift $z\gtrsim 10$. At the same time, observations and simulations are providing evidence for highly bursty star formatio…
View article: The JWST-PRIMAL Legacy Survey. A JWST/NIRSpec reference sample for the physical properties and Lyman-$α$ absorption and emission of $\sim 500$ galaxies at $z=5.5-13.4$
The JWST-PRIMAL Legacy Survey. A JWST/NIRSpec reference sample for the physical properties and Lyman-$α$ absorption and emission of $\sim 500$ galaxies at $z=5.5-13.4$ Open
One of the surprising early findings with JWST has been the discovery of a strong "roll-over" or a softening of the absorption edge of Ly$α$ in a large number of galaxies at ($z\gtrsim 6$), in addition to systematic offsets from photometri…
View article: Can Supernovae Quench Star Formation in High-z Galaxies?
Can Supernovae Quench Star Formation in High-z Galaxies? Open
JWST is providing a unique opportunity to directly study the feedback processes regulating star formation (SF) in early galaxies. The two z > 5 quiescent systems (JADES-GS-z7-01-QU and MACS0417-z5BBG) detected so far show a recent starburs…
View article: Can supernovae quench star formation in high-$z$ galaxies?
Can supernovae quench star formation in high-$z$ galaxies? Open
JWST is providing the unique opportunity to directly study feedback processes regulating star formation (SF) in early galaxies. The two $z>5$ quiescent systems (JADES-GS-z7-01-QU and MACS0417-z5BBG) detected so far show a recent starburst …
View article: Quiescent Low-mass Galaxies Observed by JWST in the Epoch of Reionization
Quiescent Low-mass Galaxies Observed by JWST in the Epoch of Reionization Open
The surprising JWST discovery of a quiescent, low-mass ( M ⋆ = 10 8.7 M ⊙ ) galaxy at redshift z = 7.3 (JADES-GS-z7-01-QU) represents a unique opportunity to study the imprint of feedback processes on early galaxy evolution. We build a sam…
View article: Quiescent low-mass galaxies observed by JWST in the Epoch of Reionization
Quiescent low-mass galaxies observed by JWST in the Epoch of Reionization Open
The surprising JWST discovery of a quiescent, low-mass ($M_\star=10^{8.7} \rm M_\odot$) galaxy at redshift $z=7.3$ (JADES-GS-z7-01-QU) represents a unique opportunity to study the imprint of feedback processes on early galaxy evolution. We…
View article: PISN-explorer: hunting the descendants of very massive first stars
PISN-explorer: hunting the descendants of very massive first stars Open
The very massive first stars (m > 100 $\rm M_{\odot }$) were fundamental to the early phases of reionization, metal enrichment, and supermassive black hole formation. Among them, those with $140\le \rm m/\rm M_{\odot }\le 260$ are predi…
View article: A survey of high-<i>z</i> galaxies: SERRA simulations
A survey of high-<i>z</i> galaxies: SERRA simulations Open
We introduce SERRA, a suite of zoom-in high-resolution (1.2 × 104 M⊙, ≃ 25 pc at z = 7.7) cosmological simulations including non-equilibrium chemistry and on-the-fly radiative transfer. The outputs are post-processed to derive galaxy UV+FI…
View article: High-z Lyman break galaxies with JWST: parallel observations of dwarf satellites
High-z Lyman break galaxies with JWST: parallel observations of dwarf satellites Open
Dwarf galaxies are the most common type of galaxies in the Universe at all epochs and they play a fundamental role in cosmic history, being responsible for the build up of massive galaxies and possibly driving the reionization and metal en…
View article: Hunting for dwarf galaxies at cosmic dawn
Hunting for dwarf galaxies at cosmic dawn Open
The greatest space telescope ever built, the James Webb Space Telescope (JWST), will be launched in October 2021, allowing us to observe the distant Universe in depth. Thanks to sophisticated high-resolution cosmological simulations, we de…
View article: Dwarf Satellites of High-z Lyman Break Galaxies: A Free Lunch for JWST
Dwarf Satellites of High-z Lyman Break Galaxies: A Free Lunch for JWST Open
We show that the James Webb Space Telescope (JWST) will be able to detect dwarf satellites of high- z Lyman break galaxies (LBGs). To this end, we use cosmological simulations following the evolution of a typical M ⋆ ≃ 10 10 M ⊙ LBG up to …
View article: The stellar populations of high-redshift dwarf galaxies
The stellar populations of high-redshift dwarf galaxies Open
We use high-resolution (≈10 pc), zoom-in simulations of a typical (stellar mass $M_\star \simeq 10^{10}\, {\rm M}_{\odot }$) Lyman Break Galaxy (LBG) at z ≃ 6 to investigate the stellar populations of its six dwarf galaxy satellites, whose…