The First Galaxies: Assembly of Disks and Prospects for Direct Detection

Abstract

The James Webb Space Telescope (JWST) will enable observations of galaxies at redshifts z > 10 and hence allow to test our current understanding of structure formation at very early times. Previous work has shown that the very first galaxies inside halos with virial temperatures T < 10^4 K and masses M < 10^8 M_sun at z > 10 are probably too faint, by at least one order of magnitude, to be detected even in deep exposures with JWST. The light collected with JWST may therefore be dominated by radiation from galaxies inside ten times more massive halos. We use cosmological zoomed smoothed particle hydrodynamics simulations to investigate the assembly of such galaxies and assess their observability with JWST. We compare two simulations that are identical except for the inclusion of non-equilibrium H/D chemistry and radiative cooling by molecular hydrogen. In both simulations a large fraction of the halo gas settles in two nested, extended gas disks which surround a compact massive gas core. The presence of molecular hydrogen allows the disk gas to reach low temperatures and to develop marked spiral structure but does not qualitatively change its stability against fragmentation. We post-process the simulated galaxies by combining idealized models for star formation with stellar population synthesis models to estimate the luminosities in nebular recombination lines as well as in the ultraviolet continuum. We demonstrate that JWST will be able to constrain the nature of the stellar populations in galaxies such as simulated here based on the detection of the He1640 recombination line. Extrapolation of our results to halos with masses both lower and higher than those simulated shows that JWST may find up to a thousand star-bursting galaxies in future deep exposures of the z > 10 universe.

arXiv comment19 pages, 13 figures. Accepted for publication in ApJ. Revised version with improved presentations and discussions

References in corpus (166)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The cosmological simulation code GADGET-2
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Populating a cluster of galaxies - I. Results at z=0
• Dwarf Galaxies of the Local Group
• How Do Galaxies Get Their Gas?
• A Line of Sight Approach to Cosmic Microwave Background Anisotropies
• The James Webb Space Telescope
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• The Formation of the First Star in the Universe
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• Concentrations of Dark Halos from their Assembly Histories
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• Virial shocks in galactic haloes?
• The Formation of the First Stars. I. The Primordial Star Forming Cloud
• At the heart of the matter: the origin of bulgeless dwarf galaxies and Dark Matter cores
• Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
• The First Stars
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Cosmological SPH simulations: The entropy equation
• On the properties of massive Population III stars and metal-free stellar populations
• How small were the first cosmological objects?
• The physics driving the cosmic star formation history
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• Observational constraints on Cosmic Reionization
• Effect of Reionization on the Structure Formation in the Universe
• On the relation between the Schmidt and Kennicutt-Schmidt star formation laws and its implications for numerical simulations
• Star formation thresholds and galaxy edges: why and where
• The transition from Population III to normal galaxies: Ly-a and HeII 1640 emission and the ionising properties of high redshift starburst galaxies
• Massloss of galaxies due to a UV-background
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• Formation of Primordial Stars in a LCDM Universe
• Simulating galactic outflows with kinetic supernova feedback
• Hydrodynamic Simulations of Galaxy Formation. II. Photoionization and the Formation of Low Mass Galaxies
• The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
• The Star Formation Law in Atomic and Molecular Gas
• Probing the Universe with the Lyman-alpha Forest: I. Hydrodynamics of the Low Density IGM
• Thick gas discs in faint dwarf galaxies
• Destruction of Molecular Hydrogen During Cosmological Reionization
• Second-Generation Objects in the Universe: Radiative Cooling and Collapse of Halos with Virial Temperatures Above 10^4 Kelvin
• Reionization of the Intergalactic Medium and the Damping Wing of the Gunn-Peterson Trough
• Stellar Feedback in Dwarf Galaxy Formation
• The halo mass function from the dark ages through the present day
• A Fundamental Relation Between Compact Stellar Nuclei, Supermassive Black Holes, and Their Host Galaxies
• The Formation of Population III Binaries from Cosmological Initial Conditions
• The formation of the first stars and galaxies
• The Role of Cold Flows in the Assembly of Galaxy Disks
• Early star-forming galaxies and the reionization of the Universe
• The First Cosmic Structures and their Effects
• The Reionization of the Universe by the First Stars and Quasars
• Early Metal Enrichment of the Intergalactic Medium by Pregalactic Outflows
• Star Formation from Galaxies to Globules
• Lyman Alpha Radiation From Collapsing Protogalaxies I: Characteristics of the Emergent Spectrum
• Molecular Hydrogen and Global Star Formation Relations in Galaxies
• Photoevaporation of Cosmological Minihalos during Reionization
• The first stars: formation of binaries and small multiple systems
• Fragmentation of star-forming clouds enriched with the first dust
• Dwarf galaxies in voids: Suppressing star formation with photo-heating
• Supermassive Black Hole Formation by Direct Collapse: Keeping Protogalactic Gas H_2--Free in Dark Matter Halos with Virial Temperatures T_vir >~ 10^4 K
• The HST Key Project on the Extragalactic Distance Scale XIII. The Metallicity Dependence of the Cepheid Distance Scale
• Gravitational fragmentation in turbulent primordial gas and the initial mass function of Population III stars
• The Role of Stellar Feedback and Dark Matter in the Evolution of Dwarf Galaxies
• Ionizing Photon Escape Fractions from High Redshift Dwarf Galaxies
• The Photo-Evaporation of Dwarf Galaxies During Reionization
• Observational Signatures of the First Quasars
• Escape of Ionizing Radiation from High Redshift Galaxies
• Resolving the Formation of Protogalaxies. III. Feedback from the First Stars
• Natural Downsizing in Hierarchical Galaxy Formation
• Zero-Metallicity Stars and the Effects of the First Stars on Reionization
• Photoionization Feedback in Low--Mass Galaxies at High Redshift
• Population III stars: hidden or disappeared ?
• The Excursion Set Theory of Halo Mass Functions, Halo Clustering, and Halo Growth
• The First Galaxies: Assembly, Cooling and the Onset of Turbulence
• Keeping the Universe ionised: Photo-heating and the clumping factor of the high-redshift intergalactic medium
• The First Galaxies: Chemical Enrichment, Mixing, and Star Formation
• Lyman Alpha Cooling Radiation from High-Redshift Halos
• Early Metal Enrichment by Pregalactic Outflows: II. Simulations of Blow-away
• Probing reionization with Lyman-alpha emission lines
• Resolving the Formation of Protogalaxies. II. Central Gravitational Collapse
• Predicted UV properties of very metal-poor starburst galaxies
• The Destruction of Cosmological Minihalos by Primordial Supernovae
• The Fate of the First Galaxies. II. Effects of Radiative Feedback
• Escape fraction of ionizing photons from high-redshift galaxies in cosmological SPH simulations
• Pathways to massive black holes and compact star clusters in pre-galactic dark matter haloes with virial temperatures > 10000K
• The transition from population III to population II-I star formation
• The Detectability of the First Stars and Their Cluster Enrichment Signatures
• Intergalactic Transmission and its Impact on the Lyα Line
• Scattered Lyman-alpha Radiation Around Sources Before Cosmological Reionization
• Reionization by Hard Photons: I. X-rays from the First Star Clusters
• From Supermassive Black Holes to Dwarf Elliptical Nuclei: a Mass Continuum
• Feedback and the Structure of Simulated Galaxies at redshift z=2
• The cooling of shock-compressed primordial gas
• The Impact of The IGM on High-Redshift Lyman Alpha Emission Lines
• Cosmological Galaxy Formation Simulations Using SPH
• Metal Enrichment of the Intergalactic Medium at z=3 by Galactic Winds
• Early Enrichment of the Intergalactic Medium and its Feedback on Galaxy Formation
• Resolving the Formation of Protogalaxies. I. Virialization
• Formation of Isolated Dwarf Galaxies with Feedback
• The Detectability of High Redshift Lyman Alpha Emission Lines Prior to the Reionization of the Universe
• Three Modes of Metal-Enriched Star Formation in the Early Universe
• The Detectability of Lyman Alpha Emission from Galaxies during the Epoch of Reionization
• Quasar Strömgren Spheres Before Cosmological Reionization
• Supernova Explosions in the Early Universe: Evolution of Radiative Remnants and the Halo Destruction Efficiency
• Anisotropy in the Distribution of Satellite Galaxy Orbits
• The Stellar Initial Mass Function in Primordial Galaxies
• Simulating high-redshift galaxies
• The preferred direction of infalling satellite galaxies in the Local Group
• Ionizing radiation from z=4-10 galaxies
• Spectroscopic confirmation of a galaxy at redshift z=8.6
• Uncovering the Chemical Signature of the First Stars in the Universe
• Thin discs, thick dwarfs and the effects of stellar feedback
• Chemical Signatures of the First Galaxies: Criteria for One-Shot Enrichment
• Cosmological Radiative Transfer Comparison Project II: The Radiation-Hydrodynamic Tests
• The Influence of Supershells and Galactic Outflows on the Escape of Ionizing Radiation from Dwarf Starburst Galaxies
• On the Kennicutt-Schmidt relation of low-metallicity high-redshift galaxies
• Occurrence of Metal-free Galaxies in the Early Universe
• The formation of compact massive self-gravitating discs in metal-free haloes with virial temperatures of ~ 13000-30000 K
• Accretion onto black holes formed by direct collapse
• Probing the First Stars with Hydrogen and Helium Recombination Emission
• Metal-Free Gas Supply at the Edge of Reionization: Late-Epoch Population III Star Formation
• The Physics and Early History of the Intergalactic Medium
• The First Galaxies: Signatures of the Initial Starburst
• Does Radiative Feedback by the First Stars Promote or Prevent Second Generation Star Formation?
• The First Stars in The Universe
• The M-sigma Relation for Nucleated Galaxies
• HeII Recombination Lines From the First Luminous Objects
• Formation of Population III Stars in Fossil HII Regions: Significance of HD
• Seeing Through the Trough: Outflows and the Detectability of Lyman Alpha Emission from the First Galaxies
• The Fate of the First Galaxies. III. Properties of Primordial Dwarf Galaxies and their Impact on the Intergalactic Medium
• On the morphologies, gas fractions, and star formation rates of small galaxies
• Computer Simulations of Cosmic Reionization
• The First Generation of Star-Forming Haloes
• Observational Signatures of the First Luminous Objects
• Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization
• On the importance of local sources of radiation for quasar absorption line systems
• The observational signature of the first H II regions
• Photo-heating and supernova feedback amplify each other's effect on the cosmic star formation rate
• Multi-frequency, thermally coupled radiative transfer with TRAPHIC: Method and tests
• The enrichment history of cosmic metals
• Environmental mechanisms shaping the nature of dwarf spheroidal galaxies; the view of computer simulations
• Numerical Simulations of High Redshift Star Formation in Dwarf Galaxies
• Star Formation at Very Low Metallicity. IV. Fragmentation Does Not Depend on Metallicity for Cold Initial Conditions
• Fragmentation in the First Galaxies
• On the Detection of High Redshift Black Holes with ALMA through CO and H2 Emission
• Resolving Gas Dynamics in the Circumnuclear Region of a Disk Galaxy in a Cosmological Simulation
• Impact of Cosmic Rays on Population III Star Formation
• The Nature of CO Emission From z~6 Quasars
• The Impact of Lyman alpha Trapping on the Formation of Primordial Objects
• Primordial Globular Clusters, X-Ray Binaries & Cosmological Reionisation
• The galaxies that reionized the Universe
• X-Ray Emission from the First Quasars
• Simulations of galaxy formation with radiative transfer: Hydrogen reionization and radiative feedback
• Radiation-Hydrodynamical Collapse of Pregalactic Clouds in the Ultraviolet Background
• On the Importance of Local Sources of Radiation in Cosmological Absorption Systems
• Signatures of Intergalactic Dust From the First Supernovae
• Primordial Molecular Emission in Population III Galaxies
• Was the Universe Reionized at Redshift 10?
• Angular Momentum and the Formation of Stars and Black Holes
• Correlations Between Central Massive Objects And Their Host Galaxies: From Bulgeless Spirals to Ellipticals
• Detecting the First Objects in the Mid-IR with NGST
• Continuum Emission by Cooling Clouds
• Effect of Cosmic UV Background on Star Formation in High Redshift Galaxies
• The First Galaxies and the Likely Discovery of their Fossils in the Local Group
• The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen
• The Effects of the Ionizing Radiation Background on Galaxy Evolution

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• CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
• The First Galaxies
• The Mid-Infrared Instrument for the James Webb Space Telescope I: Introduction
• Formation of the First Stars
• The spectral evolution of the first galaxies. I. James Webb Space Telescope detection limits and color criteria for population III galaxies
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• The First Billion Years project - III: The impact of stellar radiation on the coevolution of Populations II and III
• Constraints on the Star Formation Efficiency of Galaxies During the Epoch of Reionization
• Pre-galactic metal enrichment - The chemical signatures of the first stars
• A critical analysis of the UV-continuum slopes of high-redshift galaxies; no evidence (yet) for extreme stellar populations at z > 6
• The Detectability of Lyman Alpha Emission from Galaxies during the Epoch of Reionization
• Diagnostics for PopIII galaxies and Direct Collapse Black Holes in the early universe
• Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts
• Finding the First Cosmic Explosions I: Pair-Instability Supernovae
• The Source Density and Observability of Pair-Instability Supernovae from the First Stars
• Recovery from population III supernova explosions and the onset of second generation star formation
• Baseline Metal Enrichment from Population III Star Formation in Cosmological Volume Simulations
• Probing Pre-galactic Metal Enrichment with High-Redshift Gamma-Ray Bursts
• Starburst to quiescent from HST/ALMA: Stars and dust unveil minor mergers in submillimeter galaxies at $z\sim 4.5$
• The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results
• The First Galaxies: Assembly under Radiative Feedback from the First Stars
• A Common Origin for Globular Clusters and Ultra-faint Dwarfs in Simulations of the First Galaxies
• The Lyman-alpha signature of the first galaxies
• Detection of isolated population III stars with the James Webb Space Telescope
• Star Formation in the First Galaxies - II: Clustered Star Formation and the Influence of Metal Line Cooling
• Pair Instability Supernovae of Very Massive Population III Stars
• Imaging the redshifted 21-cm pattern around the first sources during the cosmic dawn using the SKA
• Runaway Stars and the Escape of Ionizing Radiation from High-Redshift Galaxies
• The formation of Milky Way-mass disk galaxies in the first 500 million years of a cold dark matter universe
• Finding the First Cosmic Explosions II: Core-Collapse Supernovae
• Finding the First Cosmic Explosions. III. Pulsational Pair-Instability Supernovae
• The first galaxies: simulating their feedback-regulated assembly
• Supermassive Population III Supernovae and the Birth of the First Quasars
• The Supernova that Destroyed a Protogalaxy: Prompt Chemical Enrichment and Supermassive Black Hole Growth
• Detecting gravitationally lensed population III galaxies with the Hubble Space Telescope and the James Webb Space Telescope
• Evidence for a direct collapse black hole in the Lyman-alpha source CR7
• Revisiting The First Galaxies: The epoch of Population III stars
• The Biggest Explosions in the Universe
• Observational Properties of Simulated Galaxies in Overdense and Average Regions at High Redshifts z= 6-12
• Observing Dark Stars with JWST
• Fuzzy Dark Matter at Cosmic Dawn: New 21-cm Constraints
• Observing the first galaxies
• Illuminating the Primeval Universe with Type IIn Supernovae
• The Biggest Explosions in the Universe. II
• Growth of First Galaxies: Impacts of Star Formation and Stellar Feedback
• Star formation in the first galaxies - III. Formation, evolution, and characteristics of the first stellar cluster
• Gas infall into atomic cooling haloes: on the formation of protogalactic disks and supermassive black holes at z > 10
• The Challenges of Identifying Population III Stars in the Early Universe
• Massive black hole and Population III galaxy formation in over-massive dark matter halos with violent merger histories
• How the First Stars Regulated Star Formation. II. Enrichment by Nearby Supernovae
• Formation of the first galaxies in the aftermath of the first supernovae
• Suppression of accretion onto low-mass Population III stars
• Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos
• Population III Hypernovae
• Finding the First Cosmic Explosions. IV. 90 - 140 M${}_{\odot }$ Pair-Instability Supernovae
• Dark-ages reionization and galaxy formation simulation--VII. The sizes of high-redshift galaxies
• Gamma-ray bursts and Population III stars
• Signature of the first galaxies in JWST deep field observations
• Lyman alpha emission from the first galaxies: Implications of UV backgrounds and the formation of molecules
• Effects of Star Formation Stochasticity on the Ly-alpha & Lyman Continuum Emission from Dwarf Galaxies during Reionization
• Molecular Cloud Properties and CO Line Emission in z >~ 6 Galaxies
• Dwarf Spheroidal Satellite Formation in a Reionized Local Group
• Detecting strongly lensed supernovae at z ~ 5-7 with LSST
• Deep learning approach for identification of HII regions during reionization in 21-cm observations -- II. foreground contamination
• Active Galactic Nuclei outflows in galaxy discs
• Distinctive 21 cm structures of the first stars, galaxies, and quasars
• Detectability of Supermassive Dark Stars with the Roman Space Telescope
• The Lost Dwarfs of Centaurus A and the Formation of its Dark Globular Clusters
• Formation of the First Galaxies: Theory and Simulations
• Angular momentum loss of primordial gas in Lyman-alpha radiation field
• Lessons on early structure formation from a mature galaxy cluster observed at cosmic noon
• Star Formation for Predictive Primordial Galaxy Formation