Publications (69)
Astraeus X: Indications of a top-heavy initial mass function in highly star-forming galaxies from JWST observations at z>10
Anne Hutter, Elie R Cueto, Pratika Dayal +3
The James Webb Space Telescope (JWST) has uncovered an abundance of galaxies bright in the ultraviolet (UV) that has challenged traditional theoretical models at high redshi…
Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies
Emma Giovinazzo, Pascal A. Oesch, Andrea Weibel +15
The escape fraction of Lyman continuum photons (fesc(LyC)) is the last key unknown in our understanding of cosmic reionization. Directly estimating the escape fraction (fesc) of io…
RASCAS: RAdiation SCattering in Astrophysical Simulations
Leo Michel-Dansac, Jeremy Blaizot, Thibault Garel +3
Resonant lines are powerful probes of the interstellar and circumgalactic medium of galaxies. Their transfer in gas being a complex process, the interpretation of their observation…
The Decoupled Kinematics of high-z QSO Host Galaxies and their Lya halos
Alyssa Drake, Marcel Neeleman, Bram P. Venemans +7
We present a comparison of the interstellar medium traced by [CII] (ALMA), and ionised halo gas traced by Lya (MUSE), in and around QSO host galaxies at z~6. To date, 18 QSOs at th…
The Low-Redshift Lyman Continuum Survey I: New, Diverse Local Lyman-Continuum Emitters
Sophia R. Flury, Anne E. Jaskot, Harry C. Ferguson +44
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the epoch of re…
A Bayesian approach to the halo galaxy - supermassive black hole connection through cosmic time
Christopher Boettner, Maxime Trebitsch, Pratika Dayal
We study the co-evolution of dark matter halos, galaxies and supermassive black holes using an empirical galaxy evolution model from -- . We demonstrate that by connectin…
The Low-Redshift Lyman Continuum Survey. Unveiling the ISM properties of low- Lyman continuum emitters
Alberto Saldana-Lopez, Daniel Schaerer, John Chisholm +24
Combining 66 ultraviolet (UV) spectra and ancillary data from the Low-Redshift Lyman Continuum Survey (LzLCS) and 23 LyC observations by earlier studies, we form a statistical samp…
Modelling a bright z = 6 galaxy at the faint end of the AGN luminosity function
Maxime Trebitsch, Marta Volonteri, Yohan Dubois
Recent deep surveys have unravelled a population of faint active galactic nuclei (AGN) in the high redshift Universe, leading to various discussions on their nature and their role…
Astraeus VIII: A new framework for Lyman- emitters applied to different reionisation scenarios
Anne Hutter, Maxime Trebitsch, Pratika Dayal +3
We use the {\sc astraeus} framework to investigate how the visibility and spatial distribution of Lyman- (Ly) emitters (LAEs) during reionisation is sensitive to a halo mas…
Tidal disruption events in the first billion years of a galaxy
Hugo Pfister, Jane Dai, Marta Volonteri +3
Accretion of stars on massive black holes (MBHs) can feed MBHs and generate tidal disruption events (TDEs). We introduce a new physically motivated model to self-consistently treat…
Insights on Metal Enrichment and Environmental Effect at with JWST ASPIRE/EIGER and Chemical Evolution Model
Zihao Li, Koki Kakiichi, Lise Christensen +15
We present the mass-metallicity relation (MZR) for a parent sample of 604 galaxies at with \OIII\ doublets detected, using the deep JWST/NIRCam wide field slitless sp…
Tracing Lyman-alpha and Lyman Continuum Escape in Galaxies with Mg II Emission
Xinfeng Xu, Alaina Henry, Timothy Heckman +29
Star-forming galaxies are considered the likeliest source of the H I ionizing Lyman Continuum (LyC) photons that reionized the intergalactic medium at high redshifts. However, abov…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of Quasars Using JWST
Jinyi Yang, Feige Wang, Xiaohui Fan +53
Studies of rest-frame optical emission in quasars at have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (…
Tracking on-the-fly massive black hole binary evolution and coalescence in galaxy simulations: RAMCOAL
Kunyang Li, Marta Volonteri, Yohan Dubois +2
The detection of gravitational waves (GWs) from massive black hole binary (MBHB) coalescence motivates the development of a sub-grid model. We present RAMCOAL, integrated into the…
Reionization with galaxies and active galactic nuclei
Pratika Dayal, Marta Volonteri, Tirthankar Roy Choudhury +6
In this work we investigate the properties of the sources that reionized the intergalactic medium (IGM) in the high-redshift Universe. Using a semi-analytical model aimed at reprod…
COSMOS-Web: does halo mass alone shape the clustering of star-forming and quiescent galaxies?
Louise Paquereau, Clotilde Laigle, Henry Joy McCracken +29
While stellar mass correlates strongly with halo mass, it remains unclear whether halo mass alone governs galaxy star-formation activity, or whether secondary halo properties and e…
The LISA Astrophysics MBHcatalogues Project: A comparison of predictions of simulated massive black hole binaries
David Izquierdo-Villalba, Melanie Habouzit, Matteo Bonetti +67
In the hierarchical paradigm of galaxy formation, central massive black holes (MBHs) are expected to coalesce after the merger of their host galaxies. One of the main goals of the…
A Census of Photometrically Selected Little Red Dots at 4 < z < 9 in JWST Blank Fields
Vasily Kokorev, Karina I. Caputi, Jenny E. Greene +9
Observations with the James Webb Space Telescope (JWST) have uncovered numerous faint active galactic nuclei (AGN) at and beyond. These objects are key to our understandin…
Ultra-light Axions: Degeneracies with Massive Neutrinos and Forecasts for Future Cosmological Observations
David J. E. Marsh, Edward Macaulay, Maxime Trebitsch +1
A generic prediction of string theory is the existence of many axion fields. It has recently been argued that many of these fields should be light and, like the well known QCD axio…
ASPIRE: The Environments and Dark Matter Halos of Luminous Quasars in the Epoch of Reionization
Feige Wang, Jaclyn B. Champagne, Jiamu Huang +42
We present a systematic study of the environments of 25 luminous quasars at from the ASPIRE program. Using JWST/NIRCam WFSS data, we identified 487 galaxies at $5.3 \less…
"Dust Giant": Extended and Clumpy Star-Formation in a Massive Dusty Galaxy at
Vasily Kokorev, Shuowen Jin, Carlos Gómez-Guijarro +8
We present NOEMA CO (2-1) line and ALMA 870 m continuum observations of a main-sequence galaxy at . The galaxy was initially selected as a "gas-giant", based on the gas…
A quasar-galaxy merger at : black hole mass and quasar properties from the NIRSpec spectrum
Federica Loiacono, Roberto Decarli, Marco Mignoli +31
We present JWST/NIRSpec integral field data of the quasar PJ308-21 at . As shown by previous ALMA and HST imaging, the quasar has two companion sources, interacting with…
The Obelisk simulation: galaxies contribute more than AGN to HI reionization of protoclusters
Maxime Trebitsch, Yohan Dubois, Marta Volonteri +9
We present the Obelisk project, a cosmological radiation-hydrodynamics simulation following the assembly and reionization of a protocluster progenitor during the first two billions…
The impact of an evolving stellar initial mass function on early galaxies and reionisation
Elie Rasmussen Cueto, Anne Hutter, Pratika Dayal +5
Observations with JWST have revealed an unexpected high abundance of bright z>10 galaxy candidates. We explore whether a stellar initial mass function (IMF) that becomes increasing…
Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies
Maxime Trebitsch, Jérémy Blaizot, Joakim Rosdahl +2
Low mass galaxies are thought to provide the bulk of the ionizing radiation necessary to reionize the Universe. The amount of photons escaping the galaxies is poorly constrained th…
The Low-Redshift Lyman Continuum Survey: The Roles of Stellar Feedback and ISM Geometry in LyC Escape
Sophia R. Flury, Anne E. Jaskot, Alberto Saldana-Lopez +30
One of the fundamental questions of cosmology is the origin and mechanism(s) responsible for the reionization of the Universe beyond . To address this question, many studie…
GLIMPSED: Direct evidence for a fast AGN-driven outflow from a z=6.64 Little Red Dot host galaxy
Damien Korber, Rui Marques-Chaves, Daniel Schaerer +15
We report the discovery of GLIMPSED-329380, a z=6.64 galaxy behind Abell S1063, which shows signs of an extreme ionised outflow driven by an active galactic nucleus (AGN). The deep…
Multivariate Predictors of LyC Escape I: A Survival Analysis of the Low-redshift Lyman Continuum Survey
Anne E. Jaskot, Anneliese C. Silveyra, Anna Plantinga +19
To understand how galaxies reionized the universe, we must determine how the escape fraction of Lyman Continuum (LyC) photons (fesc) depends on galaxy properties. Using the z~0.3 L…
MAGNIF: A Tentative Lensed Rotating Disk at detected by JWST NIRCam WFSS with Dynamical Forward Modeling
Zihao Li, Zheng Cai, Fengwu Sun +39
We report galaxy MACS0416-Y3 behind the lensing cluster MACSJ0416.1--2403 as a tentative rotating disk at detected through its [OIII] emission in JWST NIRCam…
Astraeus VI: Hierarchical assembly of AGN and their large-scale effect during the Epoch of Reionization
Maxime Trebitsch, Anne Hutter, Pratika Dayal +3
In this work, the sixth of a series, we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) framewo…
The Low-Redshift Lyman Continuum Survey II: New Insights into LyC Diagnostics
Sophia R. Flury, Anne E. Jaskot, Harry C. Ferguson +44
The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z {\gtrsim} 6) due to intergalactic H I absorption. To identify Lyman continuum emitters (LCEs) and infer…
The Ly and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape
Alexandra Le Reste, Anne E. Jaskot, Jordanne Brazie +20
Characterizing the mechanisms and galaxy properties conducive to the emission and escape of ionizing (LyC) emission is necessary to accurately model the Epoch of Reionization, and…
Wandering and escaping: recoiling massive black holes in cosmological simulations
Chi An Dong-Páez, Marta Volonteri, Yohan Dubois +2
After a merger of two massive black holes (MBHs), the remnant receives a gravitational wave (GW) recoil kick that can have a strong effect on its future evolution. The magnitude of…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
Feige Wang, Jinyi Yang, Joseph F. Hennawi +56
We present the first results from the JWST ASPIRE program (A SPectroscopic survey of biased halos In the Reionization Era). This program represents an imaging and spectroscopic sur…
Black hole obscuration and duty cycles mediated by AGN feedback in high redshift galaxies
Maxime Trebitsch, Marta Volonteri, Yohan Dubois
Dense gas in the centre of galaxies feeds massive black holes, but can also become a source of obscuration and limit our ability to find faint Active Galactic Nuclei (AGN). We use…
A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: I. Properties of [OIII] Emitters in a 10 Mpc Overdensity Structure
Jaclyn B. Champagne, Feige Wang, Haowen Zhang +25
ASPIRE (A SPectroscopic survey of bIased halos in the Reionization Era) is a quasar legacy survey primarily using \textit{JWST} to target a sample of 25 quasars with NIRCam s…
Linking Mg II and [O II] spatial distribution to ionizing photon escape in confirmed LyC leakers and non-leakers
Floriane Leclercq, John Chisholm, Wichahpi King +29
The geometry of the neutral gas in and around galaxies is a key regulator of the escape of ionizing photons. We present the first statistical study aiming at linking the neutral an…
Detection of stellar light from quasar host galaxies at redshifts above 6
Xuheng Ding, Masafusa Onoue, John D. Silverman +41
The detection of starlight from the host galaxies of quasars during the reionization epoch () has been elusive, even with deep HST observations. The current highest redshift q…
Astraeus VII: The environmental-dependent assembly of galaxies in the Epoch of Reionization
Laurent Legrand, Pratika Dayal, Anne Hutter +3
Using the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) framework, we explore the impact of environme…
Super-Eddington Accretion and Feedback from the First Massive Seed Black Holes
John A. Regan, Turlough P. Downes, Marta Volonteri +4
Super-Eddington accretion onto massive black hole seeds may be commonplace in the early Universe, where the conditions exist for rapid accretion. Direct collapse black holes are of…
High-redshift galaxies and black holes in the eyes of JWST: a population synthesis model from infrared to X-rays
Marta Volonteri, Amy Reines, Hakim Atek +2
The first billion years of the Universe is a pivotal time: stars, black holes (BHs) and galaxies form and assemble, sowing the seeds of galaxies as we know them today. Detecting, i…
Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from z = 0.1 to z ~ 12
Louise Paquereau, Clotilde Laigle, Henry Joy McCracken +31
We explore the evolving relationship between galaxies and their dark matter halos from to using mass-limited angular clustering measurements in the 0.54 de…
Insight Into a Lensed -dark Galaxy and its Quiescent Companion at
Vasily Kokorev, Shuowen Jin, Georgios E. Magdis +13
Using the novel /NIRCam observations in the Abell 2744 field, we present a first spatially resolved overview of an -dark galaxy, spectroscopically confirmed at …
Formation of compact galaxies in the Extreme-Horizon simulation
Solène Chabanier, Frédéric Bournaud, Yohan Dubois +18
We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy formation with stellar and AGN feedback and uses a very high resolution in the intergalactic and circu…
Multivariate Predictors of LyC Escape II: Predicting LyC Escape Fractions for High-Redshift Galaxies
Anne E. Jaskot, Anneliese C. Silveyra, Anna Plantinga +19
JWST is uncovering the properties of ever increasing numbers of galaxies at z>6, during the epoch of reionization. Connecting these observed populations to the process of reionizat…
Black hole mergers from dwarf to massive galaxies with the NewHorizon and Horizon-AGN simulations
Marta Volonteri, Hugo Pfister, Ricarda S. Beckman +12
Massive black hole (MBH) coalescences are powerful sources of low-frequency gravitational waves. To study these events in the cosmological context we need to trace the large-scale…
A Post-Starburst Pathway for the Formation of Massive Galaxies and Black Holes at z>6
Masafusa Onoue, Xuheng Ding, John D. Silverman +45
Understanding the rapid formation of supermassive black holes (SMBHs) in the early universe requires insight into stellar mass growth in host galaxies. Here, we present NIRSpec res…
Modelling LAEs in the Epoch of Reionization with OBELISK
Emma Giovinazzo, Maxime Trebitsch, Valentin Mauerhofer +2
Lya emitters (LAEs) are particularly useful objects for the study of the Epoch of Reionization. Lya profiles can be used to estimate the amount of ionizing photons that are able to…
On the general nature of 21cm-Lyman- emitters cross-correlations during reionisation
Anne Hutter, Caroline Heneka, Pratika Dayal +4
We explore how the characteristics of the cross-correlation functions between the 21cm emission from the spin-flip transition of neutral hydrogen (HI) and early Lyman- (Ly)…
Escape of ionizing radiation from high redshift dwarf galaxies: role of AGN feedback
Maxime Trebitsch, Marta Volonteri, Yohan Dubois +1
While low mass, star forming galaxies are often considered as the primary driver of reionization, their actual contribution to the cosmic ultraviolet background is still uncertain,…
Galaxies with grains: unraveling dust evolution and extinction curves with hydrodynamical simulations
Yohan Dubois, Francisco RodrÃguez Montero, Corentin Guerra +6
We introduce a model for dust evolution in the RAMSES code for simulations of galaxies with a resolved multiphase interstellar medium. Dust is modelled as a fluid transported with…
Clumpiness of galaxies revealed in the near-infrared with COSMOS-Web
Wilfried Mercier, Boris Sindhu Kalita, Marko Shuntov +30
Clumps in the rest-frame UV emission of galaxies have been observed for decades. Since the launch of the James Webb Space Telescope (JWST), a large population is detected in the re…
The SPHINX public data release. II. Using low-ionisation absorption lines and dust attenuation to predict Lyman continuum escape
Valentin Mauerhofer, Jérémy Blaizot, Thibault Garel +11
Low-ionisation state (LIS) absorption lines, such as SiII 1526, are widely used to trace the properties of the interstellar medium (ISM) in galaxies. These lines provide crucial in…
Simulating the diversity of shapes of the Lyman- line
Jeremy Blaizot, Thibault Garel, Anne Verhamme +6
The Ly line is a powerful probe of distant galaxies, which contains information about inflowing/outflowing gas through which Ly photons scatter. To develop our understandin…
The Parallel Ionizing Emissivity Survey (PIE). I. Survey design and selection of candidate Lyman Continuum leakers at 3.1<z<3.5
Alexander Beckett, Marc Rafelski, Claudia Scarlata +18
We present the survey design and initial results from the Parallel Ionizing Emissivity (PIE) survey. PIE is a large HST survey designed to detect Lyman continuum (LyC) emitting gal…
Aether-SHELLQs: JWST integral-field spectroscopy of candidate obscured quasars at z ~ 6
Yoshiki Matsuoka, Roberto Decarli, Emanuele Paolo Farina +12
We present James Webb Space Telescope (JWST) NIRSpec integral field unit (IFU) observations of six galaxies at , obtained as part of the Aether project (General Observers…
Low-redshift Lyman Continuum Survey: Radio continuum properties of low- Lyman continuum emitters
Omkar Bait, Sanchayeeta Borthakur, Daniel Schaerer +20
Sources that leak Lyman-continuum (LyC) photons and lead to the reionisation of the universe are intensely studied using multiple observing facilities. Recently, the Low-redshift L…
Before its time: a remarkably evolved protocluster core at z=7.88
Callum Witten, Pascal A. Oesch, William McClymont +11
Protoclusters represent the most extreme environments in the very early Universe. They form from large-scale dark matter overdensities, harbouring an overabundance of galaxies fed…
A quasar-galaxy merger at : rapid host growth via accretion of two massive satellite galaxies
Roberto Decarli, Federica Loiacono, Emanuele Paolo Farina +38
We present JWST/NIRSpec Integral Field Spectroscopy in the rest-frame optical bands of the system PJ308-21, a quasar at caught as its host galaxy interacts with companio…
A 13-Billion-Year View of Galaxy Growth: Metallicity Gradient Evolution from the Local Universe to with JWST and Archival Surveys
Zihao Li, Zheng Cai, Xin Wang +25
The galaxy gas-phase metallicity gradients have been extensively studied over the past four decades, both in the local and high-redshift universe, as they trace the baryon cycle an…
Bringing Stellar Evolution & Feedback Together: Summary of proposals from the Lorentz Center Workshop, 2022
Sam Geen, Poojan Agrawal, Paul A. Crowther +34
Stars strongly impact their environment, and shape structures on all scales throughout the universe, in a process known as ``feedback''. Due to the complexity of both stellar evolu…
Reionization with star-forming galaxies: insights from the Low-z Lyman Continuum Survey
Maxime Trebitsch, Pratika Dayal, John Chisholm +18
The fraction of ionizing photons escaping from galaxies, , is at the same time a crucial parameter in modelling reionization and a very poorly known quantity, especially a…
JWST's GLIMPSE: an overview of the deepest probe of early galaxy formation and cosmic reionization
Hakim Atek, John Chisholm, Vasily Kokorev +44
We present an overview of the JWST GLIMPSE program, highlighting its survey design, primary science goals, gravitational lensing models, and first results. GLIMPSE provides ultra-d…
JWST ASPIRE: How Did Galaxies Complete Reionization? Evidence for Excess IGM Transmission around Emitters during Reionization
Koki Kakiichi, Xiangyu Jin, Feige Wang +23
The spatial correlation between galaxies and the Ly forest provides insights into how galaxies reionized the Universe. Here, we present initial results on the spatial cross-cor…
A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: II. An Environmental Analysis of Galaxy Properties in an Overdense Structure
Jaclyn B. Champagne, Feige Wang, Jinyi Yang +21
We present paper II comprising a 35 arcmin \textit{JWST}/NIRCam imaging and wide-field slitless spectroscopy mosaic centered on J03053150, a luminous quasar at . The…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Broad-line AGN at revealed by JWST/NIRCam WFSS
Xiaojing Lin, Feige Wang, Xiaohui Fan +33
Low-luminosity AGNs with low-mass black holes (BHs) in the early universe are fundamental to understanding the BH growth and their co-evolution with the host galaxies. Utilizing JW…
The first GLIMPSE of the faint galaxy population at Cosmic Dawn with JWST: The evolution of the ultraviolet luminosity function across z~9-15
Iryna Chemerynska, Hakim Atek, Lukas J. Furtak +27
Using ultra-deep JWST NIRCam imaging from the GLIMPSE Survey, enhanced by gravitational lensing of the AbellS1063 cluster, we investigate the faintest galaxies ever observed in the…
A Simulated Galaxy Laboratory: Exploring the Observational Effects on UV Spectral Absorption Line Measurements
R. Michael Jennings, Alaina Henry, Valentin Mauerhofer +13
Ultraviolet absorption line spectroscopy is a sensitive diagnostic for the properties of interstellar and circumgalactic gas. Down-the-barrel observations, where the absorption is…
A Glimpse of the New Redshift Frontier Through Abell S1063
Vasily Kokorev, Hakim Atek, John Chisholm +31
We report the discovery of two galaxy candidates at redshifts between in JWST observations from the GLIMPSE survey. These robust sources were identified using a combi…