Publications (119)
CDIM: Cosmic Dawn Intensity Mapper Final Report
Asantha Cooray, Tzu-Ching Chang, Stephen Unwin +23
The Cosmic Dawn Intensity Mapper (CDIM) will transform our understanding of the era of reionization when the Universe formed the first stars and galaxies, and UV photons ionized th…
Radiative transfer simulations of cosmic reionization I: methodology and initial results
Hy Trac, Renyue Cen
We present a new hybrid code for large volume, high resolution simulations of cosmic reionization, which utilizes a N-body algorithm for dark matter, physically motivated prescript…
Approximate Bayesian Uncertainties on Deep Learning Dynamical Mass Estimates of Galaxy Clusters
Matthew Ho, Arya Farahi, Markus Michael Rau +1
We study methods for reconstructing Bayesian uncertainties on dynamical mass estimates of galaxy clusters using convolutional neural networks (CNNs). We discuss the statistical bac…
Helium Reionization Simulations. I. Modeling Quasars as Radiation Sources
Paul La Plante, Hy Trac
We introduce a new project to understand helium reionization using fully coupled -body, hydrodynamics, and radiative transfer simulations. This project aims to capture correctly…
Calibration of Nonthermal Pressure in Global Dark Matter Simulations of Clusters of Galaxies
Paul Bode, Jeremiah P. Ostriker, Renyue Cen +1
We present a new method for incorporating nonthermal pressure from bulk motions of gas into an analytic model of the intracluster medium in clusters of galaxies, which is based on…
Science from an Ultra-Deep, High-Resolution Millimeter-Wave Survey
Neelima Sehgal, Ho Nam Nguyen, Joel Meyers +66
Opening up a new window of millimeter-wave observations that span frequency bands in the range of 30 to 500 GHz, survey half the sky, and are both an order of magnitude deeper (abo…
Fast Multipole Methods for -body Simulations of Collisional Star Systems
Diptajyoti Mukherjee, Qirong Zhu, Hy Trac +1
Direct -body simulations of star clusters are accurate but expensive, largely due to the numerous pairwise force calculations. To solve the post-million-body…
Extended Lyman-Alpha Emission around Star-forming Galaxies
Zheng Zheng, Renyue Cen, David Weinberg +2
Lyman-alpha (Lya) photons that escape the interstellar medium of star-forming galaxies may be resonantly scattered by neutral hydrogen atoms in the circumgalactic and intergalactic…
Astro2020 Science White Paper: Insights Into the Epoch of Reionization with the Highly-Redshifted 21-cm Line
Steven Furlanetto, Chris L. Carilli, Jordan Mirocha +47
The epoch of reionization, when photons from early galaxies ionized the intergalactic medium about a billion years after the Big Bang, is the last major phase transition in the Uni…
Topology of the Las Campanas Redshift Survey
Hy Trac, Dimitris Mitsouras, Paul Hickson +1
The topology of the Las Campanas Redshift Survey is analyzed using Minkowski functional statistics, taking into account the selection effects of the survey. The results are compare…
The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectrum at 148 and 218 GHz from the 2008 Southern Survey
Sudeep Das, Tobias A. Marriage, Peter A. R. Ade +64
We present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spect…
Patchy Kinetic Sunyaev-Zel'dovich Effect with Controlled Reionization History and Morphology
Nianyi Chen, Hy Trac, Suvodip Mukherjee +1
Using the novel semi-numerical code for reionization AMBER, we model the patchy kinetic Sunyaev-Zel'dovich (kSZ) effect by directly specifying the reionization history with the red…
Microwave-Sky Simulations and Projections for Galaxy Cluster Detection with the Atacama Cosmology Telescope
Neelima Sehgal, Hy Trac, Kevin Huffenberger +1
We study the ability of three-frequency, arcminute-resolution microwave measurements to detect galaxy clusters via their Sunyaev-Zel'dovich (SZ) distortion of the microwave backgro…
Hydrodynamical Simulations of the IGM at High Mach Numbers
Hy Trac, Pengjie Zhang, Ue-Li Pen
We present a new approach to doing Eulerian computational fluid dynamics that is designed to work at high Mach numbers encountered in hydrodynamical simulations of the IGM. In conv…
A Hydro-Particle-Mesh Code for Efficient and Rapid Simulations of the Intracluster Medium
Yizhou He, Hy Trac, Nickolay Y. Gnedin
We introduce the cosmological HYPER code based on an innovative hydro-particle-mesh (HPM) algorithm for efficient and rapid simulations of gas and dark matter. For the HPM algorith…
Out-of-Core Hydrodynamic Simulations for Cosmological Applications
Hy Trac, Ue-Li Pen
We present an out-of-core hydrodynamic code for high resolution cosmological simulations that require terabytes of memory. Out-of-core computation refers to the technique of using…
Radiative Transfer Modeling of Lyman Alpha Emitters. I. Statistics of Spectra and Luminosity
Zheng Zheng, Renyue Cen, Hy Trac +1
We combine a cosmological reionization simulation with box size of 100Mpc/h on a side and a Monte Carlo Lyman-alpha (Lya) radiative transfer code to model Lyman Alpha Emitters (LAE…
A comparison of hydrodynamics techniques for modelling collisions between main sequence stars
Hy Trac, Alison Sills, Ue-Li Pen
An Eulerian TVD code and a Lagrangian SPH code are used to simulate the off-axis collision of equal-mass main sequence stars in order to address the question of whether stellar mer…
The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models
Erminia Calabrese, J. Colin Hill, Hidde T. Jense +169
We use new cosmic microwave background (CMB) primary temperature and polarization anisotropy measurements from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) to test fo…
The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data
Jonathan L. Sievers, Renée A. Hlozek, Michael R. Nolta +90
We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz and 218 GHz made by the Atacama Cosmology Telescope (A…
The Simons Observatory: Science goals and forecasts
The Simons Observatory Collaboration, Peter Ade, James Aguirre +247
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations in the early 2020s. We describe the scient…
The 21 cm Forest as a Probe of the Reionization and the Temperature of the Intergalactic Medium
Yidong Xu, Xuelei Chen, Zuhui Fan +2
Using high redshift radio sources as background, the 21cm forest observations probe the neutral hydrogen absorption signatures of early structures along the lines of sight. Directl…
Fireworks at Cosmic Dawn: relieving BAO-CMB tensions with the Pop III.1 Flash
Yash Aggarwal, Christopher Cain, Garett Lopez +4
A Cosmic Microwave Background (CMB) optical depth of , several in excess of the latest Planck low- EE polarization measurement, has been proposed as a way t…
The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and CDM Parameters
Thibaut Louis, Adrien La Posta, Zachary Atkins +165
We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Tele…
Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample
Michelle Ntampaka, Ken Rines, Hy Trac
We apply the Velocity Distribution Function (VDF) to a sample of Sunyaev-Zel'dovich (SZ)-selected clusters, and we report preliminary cosmological constraints in the -…
Cosmology with the Highly Redshifted 21cm Line
Adrian Liu, James Aguirre, Yacine Ali-Haimoud +47
In addition to being a probe of Cosmic Dawn and Epoch of Reionization astrophysics, the 21cm line at is also a powerful way to constrain cosmology. Its power derives from sev…
Can sterile neutrinos be the dark matter?
Uros Seljak, Alexey Makarov, Patrick McDonald +1
We use the Ly-alpha forest power spectrum measured by the SDSS and high-resolution spectroscopy observations in combination with cosmic microwave background and galaxy clustering c…
Cosmology from the Highly-Redshifted 21 cm Line
Steven Furlanetto, Adam Lidz, Abraham Loeb +26
One of the next decade's most exciting prospects is to explore the cosmic "dark ages," during which the first stars in the Universe formed, with the 21 cm line of neutral hydrogen.…
The Atacama Cosmology Telescope: DR6 Maps
Sigurd Naess, Yilun Guan, Adriaan J. Duivenvoorden +163
We present Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) maps of the Cosmic Microwave Background temperature and polarization anisotropy at arcminute resolution over three…
Reionization on Large Scales II: Detecting Patchy Reionization through Cross Correlation of the Cosmic Microwave Background
Aravind Natarajan, Nick Battaglia, Hy Trac +2
We investigate the effect of patchy reionization on the cosmic microwave background temperature. An anisotropic optical depth tau (theta) alters the TT power spectrum on small scal…
Simulations of the Microwave Sky
Neelima Sehgal, Paul Bode, Sudeep Das +5
We create realistic, full-sky, half-arcminute resolution simulations of the microwave sky matched to the most recent astrophysical observations. The primary purpose of these simula…
The Atacama Cosmology Telescope: Data Characterization and Map Making
Rolando Dünner, Matthew Hasselfield, Tobias A. Marriage +71
We present a description of the data reduction and mapmaking pipeline used for the 2008 observing season of the Atacama Cosmology Telescope (ACT). The data presented here at 148 GH…
The HI Bias during the Epoch of Reionization
Wenxiao Xu, Yidong Xu, Bin Yue +4
The neutral hydrogen (HI) and its 21 cm line are promising probes to the reionization process of the intergalactic medium (IGM). To use this probe effectively, it is imperative to…
Reionization on Large Scales IV: Predictions for the 21 cm signal incorporating the light cone effect
Paul La Plante, Nicholas Battaglia, Aravind Natarajan +4
We present predictions for the 21 cm brightness temperature power spectrum during the Epoch of Reionization (EoR). We discuss the implications of the "light cone" effect, which inc…
The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
Simone Aiola, Erminia Calabrese, Loïc Maurin +138
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013…
Dependence of the non-linear mass power spectrum on the equation of state of dark energy
Patrick McDonald, Hy Trac, Carlo Contaldi
We present N-body simulation calculations of the dependence of the power spectrum of non-linear cosmological mass density fluctuations on the equation of state of the dark energy,…
Calibrating Long Period Variables as Standard Candles with Machine Learning
Markus Michael Rau, Sergey E. Koposov, Hy Trac +1
Variable stars with well-calibrated period-luminosity relationships provide accurate distance measurements to nearby galaxies and are therefore a vital tool for cosmology and astro…
Aging Halos: Implications of the Magnitude Gap on Conditional Statistics of Stellar and Gas Properties of Massive Halos
Arya Farahi, Matthew Ho, Hy Trac
Cold dark matter model predicts that the large-scale structure grows hierarchically. Small dark matter halos form first. Then, they grow gradually via continuous merger and accreti…
The Atacama Cosmology Telescope: The Two-Season ACTPol Sunyaev-Zel'dovich Effect Selected Cluster Catalog
Matt Hilton, Matthew Hasselfield, Cristóbal Sifón +41
We present a catalog of 182 galaxy clusters detected through the Sunyaev-Zel'dovich effect by the Atacama Cosmology Telescope in a contiguous 987.5 deg field. The clusters we…
The Atacama Cosmology Telescope: Dynamical masses for 44 SZ-selected galaxy clusters over 755 square degrees
Cristóbal Sifón, Nick Battaglia, Matthew Hasselfield +22
We present galaxy velocity dispersions and dynamical mass estimates for 44 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect by the Atacama Cosmology Telescope. Dynam…
A Robust and Efficient Deep Learning Method for Dynamical Mass Measurements of Galaxy Clusters
Matthew Ho, Markus Michael Rau, Michelle Ntampaka +3
We demonstrate the ability of convolutional neural networks (CNNs) to mitigate systematics in the virial scaling relation and produce dynamical mass estimates of galaxy clusters wi…
Examining the effects of dark matter spikes on eccentric intermediate mass ratio inspirals using N-body simulations
Diptajyoti Mukherjee, A. Miguel Holgado, Go Ogiya +1
Recent studies suggest that dark matter (DM) spikes around intermediate-mass black holes could cause observable dephasing in gravitational wave (GW) signals from Intermediate Mass…
The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth
Frank J. Qu, Blake D. Sherwin, Mathew S. Madhavacheril +155
We present new measurements of cosmic microwave background (CMB) lensing over sq. deg. of the sky. These lensing measurements are derived from the Atacama Cosmology Telescop…
Weak-Lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with the Hyper Suprime-Cam Survey
Hironao Miyatake, Nicholas Battaglia, Matt Hilton +57
We present weak-lensing measurements using the first-year data from the Hyper Suprime-Cam Strategic Survey Program on the Subaru telescope for eight galaxy clusters selected throug…
Reconstructing the redshift evolution of escaped ionizing flux from early galaxies with Planck and HST observations
Layne C. Price, Hy Trac, Renyue Cen
While galaxies at are believed to dominate the epoch of cosmic reionization, the escape fraction of ionizing flux and the photon product…
The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck
Daniel Glazer, Markus Michael Rau, Hy Trac
We study the reionization parameter space consistent with the current measurement of the Thomson optical depth using a new parametrization of the reionization history. The mass-wei…
The Simons Observatory: Astro2020 Decadal Project Whitepaper
The Simons Observatory Collaboration, Maximilian H. Abitbol, Shunsuke Adachi +280
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert in Chile that promises to provide breakthrough…
The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations
Amir Hajian, Viviana Acquaviva, Peter A. R. Ade +64
We present a new calibration method based on cross-correlations with WMAP and apply it to data from the Atacama Cosmology Telescope (ACT). ACT's observing strategy and map making p…
Radiative Transfer Modeling of Lyman Alpha Emitters. II. New Effects in Galaxy Clustering
Zheng Zheng, Renyue Cen, Hy Trac +1
We study the clustering properties of z~5.7 Lyman-alpha emitters (LAEs) in a cosmological reionization simulation with a full Lya radiative transfer calculation. Lya radiative tran…
The Atacama Cosmology Telescope: Detection of Sunyaev-Zel'dovich Decrement in Groups and Clusters Associated with Luminous Red Galaxies
Nick Hand, John William Appel, Nick Battaglia +42
We present a detection of the Sunyaev-Zel'dovich (SZ) decrement associated with the Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey. The SZ data come from 148 GHz…
Reconstructing Galaxy Cluster Mass Maps using Score-based Generative Modeling
Alan Hsu, Matthew Ho, Joyce Lin +4
We present a novel approach to reconstruct gas and dark matter projected density maps of galaxy clusters using score-based generative modeling. Our diffusion model takes in mock SZ…
A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
Christopher Cain, Anson D'Aloisio, Vid IrÅ¡iÄ +2
We examine the impact of baryon-dark matter relative velocities on intergalactic small-scale structure and the 21 cm signal during reionization. Streaming velocities reduced clumpi…
The hydrodynamic response of small-scale structure to reionization drives large IGM temperature fluctuations that persist to z = 4
Christopher Cain, Evan Scannapieco, Matthew McQuinn +2
The thermal history and structure of the intergalactic medium (IGM) at is an important boundary condition for reionization, and a key input for studies using the Ly…
The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters
Mathew S. Madhavacheril, Frank J. Qu, Blake D. Sherwin +156
We present cosmological constraints from a gravitational lensing mass map covering 9400 sq. deg. reconstructed from CMB measurements made by the Atacama Cosmology Telescope (ACT) f…
The Atacama Cosmology Telescope: CMB Polarization at
Sigurd Naess, Matthew Hasselfield, Jeff McMahon +75
We report on measurements of the cosmic microwave background (CMB) and celestial polarization at 146 GHz made with the Atacama Cosmology Telescope Polarimeter (ACTPol) in its first…
The Topology of Cosmological Reionization
Khee-Gan Lee, Renyue Cen, J. Richard Gott +1
Using the largest cosmological reionization simulation to-date (~24 billion particles), we use the genus curve to quantify the topology of neutral hydrogen distribution on scales >…
The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel'dovich Effect Using the Skewness of the CMB Temperature Distribution
Michael J. Wilson, Blake D. Sherwin, J. Colin Hill +35
We present a detection of the unnormalized skewness <T^3> induced by the thermal Sunyaev-Zel'dovich (tSZ) effect in filtered Atacama Cosmology Telescope (ACT) 148 GHz cosmic microw…
Systematic errors in the measurement of neutrino masses due to baryonic feedback processes: Prospects for stage IV lensing surveys
Aravind Natarajan, Andrew R. Zentner, Nicholas Battaglia +1
We examine the importance of baryonic feedback effects on the matter power spectrum on small scales, and the implications for the precise measurement of neutrino masses through gra…
The Atacama Cosmology Telescope: DR6 Power Spectrum Foreground Model and Validation
Benjamin Beringue, Kristen M. Surrao, J. Colin Hill +28
We discuss the model of astrophysical emission at millimeter wavelengths used to characterize foregrounds in the multi-frequency power spectra of the Atacama Cosmology Telescope (A…
A First Look at creating mock catalogs with machine learning techniques
Xiaoying Xu, Shirley Ho, Hy Trac +3
We investigate machine learning (ML) techniques for predicting the number of galaxies (N_gal) that occupy a halo, given the halo's properties. These types of mappings are crucial f…
The Atacama Cosmology Telescope: Combined kinematic and thermal Sunyaev-Zel'dovich measurements from BOSS CMASS and LOWZ halos
Emmanuel Schaan, Simone Ferraro, Stefania Amodeo +55
The scattering of cosmic microwave background (CMB) photons off the free-electron gas in galaxies and clusters leaves detectable imprints on high resolution CMB maps: the thermal a…
Helium Reionization Simulations. III. The Helium Lyman- Forest
Paul La Plante, Hy Trac, Rupert Croft +1
In La Plante et al. (2017), we presented a new suite of hydrodynamic simulations with the aim of accurately capturing the process of helium II reionization. In this paper, we discu…
The Atacama Cosmology Telescope: Cosmology from Galaxy Clusters Detected via the Sunyaev-Zel'dovich Effect
Neelima Sehgal, Hy Trac, Viviana Acquaviva +66
We present constraints on cosmological parameters based on a sample of Sunyaev-Zel'dovich-selected galaxy clusters detected in a millimeter-wave survey by the Atacama Cosmology Tel…
Debiased Galaxy Cluster Pressure Profiles from X-ray Observations and Simulations
Yizhou He, Philip Mansfield, Markus M. Rau +2
We present an updated model for the average cluster pressure profile, adjusted for hydrostatic mass bias by combining results from X-ray observations with cosmological simulations.…
Towards optimal parallel PM N-body codes: PMFAST
Hugh Merz, Ue-Li Pen, Hy Trac
We present a new parallel PM N-body code named PMFAST that is freely available to the public. PMFAST is based on a two-level mesh gravity solver where the gravitational forces are…
Reionization on Large Scales I: A Parametric Model Constructed from Radiation-Hydrodynamic Simulations
Nick Battaglia, Hy Trac, Renyue Cen +1
We present a new method for modeling inhomogeneous cosmic reionization on large scales. Utilizing high-resolution radiation-hydrodynamic simulations with 2048^3 dark matter particl…
Introducing SAGUARO -- Simulating IGM Evolution and Environments At High Resolution: Setup and First Results
Christopher Cain, Aloha Das, Anson D'Aloisio +7
Small-scale physics in the intergalactic medium (IGM) plays a crucial role in shaping the progress of cosmic reionization and several high-redshift observables that probe this peri…
The Atacama Cosmology Telescope: Physical Properties and Purity of a Galaxy Cluster Sample Selected via the Sunyaev-Zel'dovich Effect
Felipe Menanteau, Jorge Gonzalez, Jean-Baptiste Juin +48
We present optical and X-ray properties for the first confirmed galaxy cluster sample selected by the Sunyaev-Zel'dovich Effect from 148 GHz maps over 455 square degrees of sky mad…
A Moving Frame Algorithm for High Mach Number Hydrodynamics
Hy Trac, Ue-Li Pen
We present a new approach to Eulerian computational fluid dynamics that is designed to work at high Mach numbers encountered in astrophysical hydrodynamic simulations. The Eulerian…
SCORCH. III. Analytical Models of Reionization with Varying Clumping Factors
Nianyi Chen, Aristide Doussot, Hy Trac +1
In the Simulations and Constructions of the Reionization of Cosmic Hydrogen (SCORCH) project, we compare analytical models of the hydrogen ionization fraction with radiation-hydrod…
The Role of Machine Learning in the Next Decade of Cosmology
Michelle Ntampaka, Camille Avestruz, Steven Boada +27
In recent years, machine learning (ML) methods have remarkably improved how cosmologists can interpret data. The next decade will bring new opportunities for data-driven cosmologic…
The Atacama Cosmology Telescope: Sunyaev-Zel'dovich Selected Galaxy Clusters at 148 GHz from Three Seasons of Data
Matthew Hasselfield, Matt Hilton, Tobias A. Marriage +41
[Abridged] We present a catalog of 68 galaxy clusters, of which 19 are new discoveries, detected via the Sunyaev-Zel'dovich effect (SZ) at 148 GHz in the Atacama Cosmology Telescop…
Cosmic Reionization and the 21-cm signal: Comparison between an analytical model and a simulation
Mario G. Santos, Alexandre Amblard, Jonathan Pritchard +3
We measure several properties of the reionization process and the corresponding low-frequency 21-cm signal associated with the neutral hydrogen distribution, using a large volume,…
A Multi-Wavelength Technique for Estimating Galaxy Cluster Mass Accretion Rates
John Soltis, Michelle Ntampaka, Benedikt Diemer +7
The mass accretion rate of galaxy clusters is a key factor in determining their structure, but a reliable observational tracer has yet to be established. We present a state-of-the-…
AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
Hy Trac, Nianyi Chen, Ian Holst +2
The Abundance Matching Box for the Epoch of Reionization (AMBER) is a semi-numerical code for modeling the cosmic dawn. The new algorithm is not based on the excursion set formalis…
Precision Epoch of Reionization studies with next-generation CMB experiments
Erminia Calabrese, Renée Hložek, Nick Battaglia +21
Future arcminute resolution polarization data from ground-based Cosmic Microwave Background (CMB) observations can be used to estimate the contribution to the temperature power spe…
The intergalactic medium temperature and Compton y parameter
Pengjie Zhang, Ue-Li Pen, Hy Trac
(Abridged) The precision modeling of the thermal Sunyaev Zeldovich (SZ) effect and future high accuracy measurements will provide a powerful way to constrain the thermal history of…
The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
Steve K. Choi, Matthew Hasselfield, Shuay-Pwu Patty Ho +136
We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg of the 2013-2016 survey, which cove…
Parametrizing the Reionization History with the Redshift Midpoint, Duration, and Asymmetry
Hy Trac
A new parametrization of the reionization history is presented to facilitate robust comparisons between different observations and with theory. The evolution of the ionization frac…
The Atacama Cosmology Telescope: Reionization kSZ trispectrum methodology and limits
Niall MacCrann, Frank J. Qu, Toshiya Namikawa +20
Patchy reionization generates kinematic Sunyaev-Zeldovich (kSZ) anisotropies in the cosmic microwave background (CMB). Large-scale velocity perturbations along the line of sight mo…
Cosmological HII Bubble Growth During Reionization
Min-Su Shin, Hy Trac, Renyue Cen
We present general properties of ionized hydrogen (HII) bubbles and their growth based on a state-of-the-art large-scale (100 Mpc/h) cosmological radiative transfer simulation. The…
Astro 2020 Science White Paper: Fundamental Cosmology in the Dark Ages with 21-cm Line Fluctuations
Steven Furlanetto, Judd D. Bowman, Jordan Mirocha +43
The Dark Ages are the period between the last scattering of the cosmic microwave background and the appearance of the first luminous sources, spanning approximately 1100 < z < 30.…
Precision era of the kinetic Sunyaev-Zeldovich effect: simulations, analytical models and observations and the power to constrain reionization
Pengjie Zhang, Ue-Li Pen, Hy Trac
The kinetic SZ effect, which is the dominant CMB source at arc-minute scales and Ghz, probes the ionized gas peculiar momentum up to the epoch of reionization and is a…
The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel'dovich One-Point PDF
J. Colin Hill, Blake D. Sherwin, Kendrick M. Smith +31
We present a measurement of the one-point probability distribution function (PDF) of the thermal Sunyaev-Zel'dovich (tSZ) decrement in the pixel temperature histogram of filtered 1…
A Primer on Eulerian Computational Fluid Dynamics for Astrophysics
Hy Trac, Ue-Li Pen
We present a pedagogical review of some of the methods employed in Eulerian computational fluid dynamics (CFD). Fluid mechanics is governed by the Euler equations, which are conser…
Mapping Cosmic Dawn and Reionization: Challenges and Synergies
Marcelo A. Alvarez, Anastasia Fialkov, Paul La Plante +47
Cosmic dawn and the Epoch of Reionization (EoR) are among the least explored observational eras in cosmology: a time at which the first galaxies and supermassive black holes formed…
Templates for the Sunyaev-Zel'dovich Angular Power Spectrum
Hy Trac, Paul Bode, Jeremiah P. Ostriker
We present templates for the Sunyaev-Zel'dovich (SZ) angular power spectrum based on four models for the nonlinear gas distribution. The frequency-dependent SZ temperature fluctuat…
Kiloparsec-scale turbulence driven by reionization may grow intergalactic magnetic fields
Christopher Cain, Matthew McQuinn, Evan Scannapieco +2
The intergalactic medium (IGM) underwent intense heating that resulted in pressure disequilibrium in the wake of ionization fronts during cosmic reionization. The dynamical relaxat…
SCORCH. II. Radiation-Hydrodynamic simulations of reionization with varying radiation escape fractions
Aristide Doussot, Hy Trac, Renyue Cen
In the Simulations and Constructions of the Reionization of Cosmic Hydrogen (SCORCH) project, we present new radiation-hydrodynamic simulations with updated high-redshift galaxy po…
Evolution of Massive Black Hole Binaries in Collisionally Relaxed Nuclear Star Clusters -- Impact of Mass Segregation
Diptajyoti Mukherjee, Qirong Zhu, Go Ogiya +2
Massive Black Hole (MBH) binaries are considered to be one of the most important sources of Gravitational Waves (GW) that can be detected by GW detectors like LISA. However, there…
Helium Reionization Simulations. II. Signatures of Quasar Activity on the IGM
Paul La Plante, Hy Trac, Rupert Croft +1
We have run a new suite of simulations that solve hydrodynamics and radiative transfer simultaneously to study helium II reionization. Our suite of simulations employs various mode…
Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect
Nick Hand, Graeme E. Addison, Eric Aubourg +55
Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time present strong evidence for motions of galaxy clusters and groups via microw…
The Atacama Cosmology Telescope: High-resolution component-separated maps across one-third of the sky
William R. Coulton, Mathew S. Madhavacheril, Adriaan J. Duivenvoorden +151
Observations of the millimeter sky contain valuable information on a number of signals, including the blackbody cosmic microwave background (CMB), Galactic emissions, and the Compt…
The Dynamical Mass of the Coma Cluster from Deep Learning
Matthew Ho, Michelle Ntampaka, Markus Michael Rau +4
In 1933, Fritz Zwicky's famous investigations of the mass of the Coma cluster led him to infer the existence of dark matter \cite{1933AcHPh...6..110Z}. His fundamental discoveries…
Computer Simulations of Cosmic Reionization
Hy Trac, Nickolay Y. Gnedin
The cosmic reionization of hydrogen was the last major phase transition in the evolution of the universe, which drastically changed the ionization and thermal conditions in the cos…
Astrophysics from the Highly-Redshifted 21 cm Line
Steven Furlanetto, Adam Lidz, Abraham Loeb +26
The cosmic dark ages and the epoch of reionization, during which the first generations of stars and galaxies formed, are among the most compelling frontiers of extragalactic astrop…
The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters
Thibaut Louis, Emily Grace, Matthew Hasselfield +80
We present the temperature and polarization angular power spectra measured by the Atacama Cosmology Telescope Polarimeter (ACTPol). We analyze night-time data collected during 2013…
Close Encounters of the Interstellar Kind: Examining the Capture of Interstellar Objects in Near Earth Orbit
Diptajyoti Mukherjee, Amir Siraj, Hy Trac +1
Recent observations and detections of interstellar objects (ISOs) passing through the solar system have sparked a wave of interest into these objects. Although rare, these ISOs can…
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…
Hydrodynamic Response of the Intergalactic Medium to Reionization
Anson D'Aloisio, Matthew McQuinn, Hy Trac +2
The intergalactic medium is expected to clump on scales down to M before the onset of reionization. The impact of these small-scale structures on reionization…