Publications (42)
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…
Exploring Cosmic Dawn with PANORAMIC I: The Bright End of the UVLF at
Andrea Weibel, Pascal A. Oesch, Christina C. Williams +14
In its first two years of operation, the James Webb Space Telescope has enabled the discovery of a surprising number of UV-bright galaxies at . Their number density is…
Ruling out 3 keV warm dark matter using 21 cm-EDGES data
Atrideb Chatterjee, Pratika Dayal, Tirthankar Roy Choudhury +1
Weakly interacting cold dark matter (CDM) particles, which are otherwise extremely successful in explaining various cosmological observations, exhibit a number of problems on small…
Dilution of chemical enrichment in galaxies 600 Myr after the Big Bang
Kasper E. Heintz, Gabriel B. Brammer, Clara Giménez-Arteaga +10
Galaxies throughout the last 12 Gyr of cosmic time follow a single, universal relation that connects their star-formation rates (SFRs), stellar masses () and chemical abun…
Exploring 21cm - Lyman Alpha emitter synergies for SKA
Anne Hutter, Pratika Dayal, Volker Müller +1
We study the signatures of reionization and ionizing properties of the early galaxies in the cross-correlations between the 21cm emission from the spin-flip transition of neutral h…
Bright Galaxies at Cosmic Dawn: A Cloud-Scale Star Formation Model Unifying Variable SFE, IMFs, and Stochasticity
Elie Cueto, Anne Hutter
To investigate the origins of the high abundance of UV-bright galaxies at z > 10, we present a new semi-analytic model that bridges the gap between small-scale star formation physi…
The ALMA REBELS Survey: Efficient Ly Transmission of UV-Bright z7 Galaxies from Large Velocity Offsets and Broad Line Widths
Ryan Endsley, Daniel P. Stark, Rychard J. Bouwens +19
Recent work has shown that UV-luminous reionization-era galaxies often exhibit strong Lyman-alpha emission despite being situated at redshifts where the IGM is thought to be substa…
The 21cm-galaxy cross-correlation: Realistic forecast for 21cm signal detection and reionisation constraints
Anne Hutter, Caroline Heneka
21cm-galaxy cross-correlation will play a key role in confirming the cosmological 21cm signal. We investigate which survey configurations detect the 21cm-LAE cross-correlation sign…
Square Kilometer Array Synergies for the Epoch of Reionization and Cosmic Dawn
Anirban Chakraborty, Tirthankar R. Choudhury, Kanan K. Datta +15
Synergies with other instruments will be essential in making, verifying, and interpreting a detection of the cosmic 21-cm signal from the Epoch of Reionization (EoR) and Cosmic Daw…
Deep JWST spectroscopy of galaxies in a candidate ionized bubble at : probing reionization at pMpc scales with Ly emission
Lily Whitler, Daniel P. Stark, Charlotte A. Mason +5
Strong Ly emission observed from galaxies when the Universe is expected to be highly neutral is thought to trace large ionized regions that facilitate the transmission of Ly$α…
Constraining reionization morphology and source properties with 21cm galaxy cross-correlation surveys
Yannic Pietschke, Anne Hutter, Caroline Heneka
Cross-correlations between 21cm observations and galaxy surveys provide a powerful probe of reionization by providing robustness against foreground contamination while linking ioni…
The 21cm bispectrum during reionization: a tracer of the ionization topology
Anne Hutter, Catherine A. Watkinson, Jacob Seiler +3
We compute the bispectra of the 21cm signal during the Epoch of Reionization for three different reionization scenarios that are based on a dark matter N-body simulation combined w…
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…
The PANORAMIC Survey: Pure Parallel Wide Area Legacy Imaging with JWST/NIRCam
Christina C. Williams, Pascal A. Oesch, Andrea Weibel +15
We present the PANORAMIC survey, a pure parallel extragalactic imaging program with NIRCam observed during JWST Cycle 1. The survey obtained 530 sq arcmin of NIRCam imaging f…
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…
The Indirect Influence of Quasars on Reionization
Jacob Seiler, Anne Hutter, Manodeep Sinha +1
The exact role of quasars during the Epoch of Reionization remains uncertain. With consensus leaning towards quasars producing a negligible amount of ionizing photons, we pose an a…
Survey parameters for detecting 21cm - Ly emitter cross correlations with the Square Kilometre Array
Anne Hutter, Cathryn M. Trott, Pratika Dayal
Detections of the cross correlation signal between the 21cm signal during reionization and high-redshift Lyman Alpha emitters (LAEs) are subject to observational uncertainties whic…
Cosmic Dawn and Reionization: Astrophysics in the Final Frontier
Asantha Cooray, James Aguirre, Yacine Ali-Haimoud +71
The cosmic dawn and epoch of reionization mark the time period in the universe when stars, galaxies, and blackhole seeds first formed and the intergalactic medium changed from neut…
Astraeus V: The emergence and evolution of metallicity scaling relations during the Epoch of Reionization
Graziano Ucci, Pratika Dayal, Anne Hutter +6
In this work, we have implemented a detailed physical model of galaxy chemical enrichment into the (semi-numerical rAdiative tranSfer coupling of galaxy formaTion…
Astraeus III: The environment and physical properties of reionization sources
Anne Hutter, Pratika Dayal, Laurent Legrand +2
In this work, we use the {\sc astraeus} (seminumerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dArk mattEr simUlationS) framework which couples g…
AstraeusIV : Quantifying the star formation histories of galaxies in the Epoch of Reionization
Laurent Legrand, Anne Hutter, Pratika Dayal +3
We use the \textsc{astraeus} framework, that couples an N-body simulation with a semi-analytic model for galaxy formation and a semi-numerical model for reionization, to quantify t…
Astro2020 Science White Paper: A proposal to exploit galaxy-21cm synergies to shed light on the Epoch of Reionization
Anne Hutter, Pratika Dayal, Sangeeta Malhotra +26
This white paper highlights the crucial and urgent synergies required between WFIRST, Subaru Hyper Suprime-Cam or other >25m-class telescopes galaxy observations and SKA 21cm measu…
PANORAMIC: Discovery of an Ultra-Massive Grand-Design Spiral Galaxy at
Mengyuan Xiao, Christina C. Williams, Pascal A. Oesch +26
We report the discovery of an ultra-massive grand-design red spiral galaxy, named Zhúlóng (Torch Dragon), at in the JWST PANORAMIC survey, iden…
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)…
Astraeus I: The interplay between galaxy formation and reionization
Anne Hutter, Pratika Dayal, Gustavo Yepes +3
We introduce a new self-consistent model of galaxy evolution and reionization, ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body d…
The accuracy of semi-numerical reionization models in comparison with radiative transfer simulations
Anne Hutter
We have developed a modular semi-numerical code that computes the time and spatially dependent ionization of neutral hydrogen (HI), neutral (HeI) and singly ionized helium (HeII) i…
A Search for H-Dropout Lyman Break Galaxies at z~12-16
Yuichi Harikane, Akio K. Inoue, Ken Mawatari +11
We present two bright galaxy candidates at z~12-13 identified in our H-dropout Lyman break selection with 2.3 deg2 near-infrared deep imaging data. These galaxy candidates, selecte…
Clustering and lifetime of Lyman Alpha Emitters in the Epoch of Reionization
Anne Hutter, Pratika Dayal, Volker Müller
We calculate Lyman Alpha Emitter (LAE) angular correlation functions (ACFs) at and the fraction of lifetime (for the 100 Myrs preceding ) galaxies spend…
Extreme damped Lyman- absorption in young star-forming galaxies at
Kasper E. Heintz, Darach Watson, Gabriel Brammer +18
The onset of galaxy formation is thought to be initiated by the infall of neutral, pristine gas onto the first protogalactic halos. However, direct constraints on the abundance of…
Mapping reionization bubbles in the JWST era I: empirical edge detection with Lyman alpha emission from galaxies
Ting-Yi Lu, Charlotte A. Mason, Andrei Mesinger +7
Ionized bubble sizes during reionization trace physical properties of the first galaxies. JWST's ability to spectroscopically confirm and measure Lyman-alpha (Ly) emission in s…
The reionising bubble size distribution around galaxies
Ting-Yi Lu, Charlotte Mason, Anne Hutter +4
Constraining when and how reionisation began is pivotal for understanding when the first galaxies formed. Lyman-alpha (Ly) emission from galaxies is currently our most promisin…
Exploring Cosmic Dawn with PANORAMIC II: Cosmic Variance and Galaxy Clustering at
Andrea Weibel, Christian Kragh Jespersen, Pascal A. Oesch +10
Observational campaigns with JWST have revealed a higher-than-expected abundance of UV-bright galaxies at , with various proposed theoretical explanations. A powerful c…
Anatomy of an ionized bubble: NIRCam grism spectroscopy of the double-peaked Lyman- emitter COLA1 and its environment
Alberto Torralba-Torregrosa, Jorryt Matthee, Rohan P. Naidu +10
The increasingly neutral intergalactic gas at impacts the Lyman- flux observed from galaxies. One luminous galaxy, COLA1, stands out because of its unique double-peaked L…
Astraeus II: Quantifying the impact of cosmic variance during the Epoch of Reionization
Graziano Ucci, Pratika Dayal, Anne Hutter +6
Next generation telescopes such as the James Webb Space Telescope (JWST) and the Nancy Grace Roman Space Telescope (NGRST) will enable us to study the first billion years of our Un…
The beaming of external Compton emission
Anne Hutter, Felix Spanier
We consider a relativistically moving blob consisting of an isotropic electron distribution that Compton-scatters photons from an external isotropic radiation field. We compute the…
Using the sample variance of 21cm maps as a tracer of the ionisation topology
Adélie Gorce, Anne Hutter, Jonathan R. Pritchard
Intensity mapping of the 21cm signal of neutral hydrogen will yield exciting insights into the Epoch of Reionisation and the nature of the first galaxies. However, the large amount…
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…
The JWST/PASSAGE Survey: Testing Reionization Histories with JWST's First Unbiased Survey for Lyman alpha Emitters at Redshifts 7.5-9.5
Axel Runnholm, Matthew J. Hayes, Vihang Mehta +25
Lyman (Ly) emission is one of few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To ac…
The Escape Fraction of Ionizing Photons During the Epoch of Reionization: observability with the Square Kilometre Array
Jacob Seiler, Anne Hutter, Manodeep Sinha +1
One of the most important parameters in characterizing the Epoch of Reionization, the escape fraction of ionizing photons, , remains unconstrained both observationa…
The Wide Field Infrared Survey Telescope: 100 Hubbles for the 2020s
Rachel Akeson, Lee Armus, Etienne Bachelet +103
The Wide Field Infrared Survey Telescope (WFIRST) is a 2.4m space telescope with a 0.281 deg^2 field of view for near-IR imaging and slitless spectroscopy and a coronagraph designe…
Overview of 21cm Experiments at high redshift with SKAO
CD Science Working Group, Gianni Bernardi, Daniela Breitman +81
We provide an overview of the eight SKAO Science Book chapters that motivate the Epoch of Reionisation and Cosmic Dawn experiments with SKA-Low. We describe the individual SKA-Low…
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…