Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies

Abstract

Direct observational searches for Population III (Pop III) stars at high redshift are faced with the question of how to select the most promising targets for spectroscopic follow-up. To help answer this, we use a large-scale cosmological simulation, augmented with a new subgrid model that tracks the fraction of pristine gas, to follow the evolution of high-redshift galaxies and the Pop III stars they contain. We generate rest-frame ultraviolet (UV) luminosity functions for our galaxies and find that they are consistent with current $z\ge 7$ observations. Throughout the redshift range $7\le z\le 15$ we identify "Pop III-bright" galaxies as those with at least 75% of their flux coming from Pop III stars. While less than 1% of galaxies brighter than $m_{\mathrm{UV},\mathrm{AB}}=31.4$ mag are Pop III--bright in the range $7\le z\le 8$, roughly 17% of such galaxies are Pop III--bright at $z=9$, immediately before reionization occurs in our simulation. Moving to $z=10$, $m_{\mathrm{UV},\mathrm{AB}}=31.4$ mag corresponds to larger, more luminous galaxies and the Pop III-bright fraction falls off to 5%. Finally, at the highest redshifts, a large fraction (29% at $z=14$ and 41% at $z=15)$ of all galaxies are Pop III-bright regardless of magnitude. While $m_{\mathrm{UV},\mathrm{AB}}=31.4$ mag galaxies are extremely rare during this epoch, we find that 13% of galaxies at $z=14$ are Pop III-bright with $m_{\mathrm{UV},\mathrm{AB}}\le 33$ mag, an intrisic magnitude within reach of the James Webb Space Telescope using lensing. Thus, we predict that the best redshift to search for luminous Pop III--bright galaxies is just before reionization, while lensing surveys for fainter galaxies should push to the highest redshifts possible.

Accepted for publication by ApJ, Updated version with correct Figure 6

References in corpus (27)

• Cosmic Star Formation History
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The James Webb Space Telescope
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• Nucleosynthetic signatures of the first stars
• The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models
• An extremely primitive halo star
• On the onset of galactic winds in quiescent star forming galaxies
• Population III stars: hidden or disappeared ?
• Population III star formation in a Lambda CDM universe, I: The effect of formation redshift and environment on protostellar accretion rate
• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• Initial Conditions for Large Cosmological Simulations
• A simple multigrid scheme for solving the Poisson equation with arbitrary domain boundaries
• New redshift z ~ 9 galaxies in the Hubble Frontier Fields: Implications for early evolution of the UV luminosity density
• Simulating cosmic metal enrichment by the first galaxies
• Constraining the primordial initial mass function with stellar archaeology
• Significant primordial star formation at redshifts z ~ 3-4
• Recovery from population III supernova explosions and the onset of second generation star formation
• New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from millimeter observations
• A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies
• The Spatial Distribution of the Galactic First Stars I: High-Resolution N-body Approach
• Using Spatial Distributions to Constrain Progenitors of Supernovae and Gamma Ray Bursts
• Following The Cosmic Evolution Of Pristine Gas I: Implications For Milky Way Halo Stars
• Very Massive Stars in High-Redshift Galaxies
• Looking for Population III stars with He II line intensity mapping
• Upper limits on the mass and luminosity of Population III-dominated galaxies

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• A Highly Magnified Star at Redshift 6.2
• Descendants of the first stars: the distinct chemical signature of second generation stars
• When did Population III star formation end?
• Legacy of star formation in the pre-reionization universe
• JWST-JADES. Possible Population III signatures at z=10.6 in the halo of GN-z11
• An extremely metal poor star complex in the reionization era: Approaching Population III stars with JWST
• The Effects of Population III X-ray and Radio Backgrounds on the Cosmological 21-cm Signal
• The Persistence of Population III Star Formation
• The Universe at extreme magnification
• The assembly of dusty galaxies at $z\ge 4$: the build-up of stellar mass and its scaling relations with hints from early JWST data
• Metal Mixing and Ejection in Dwarf Galaxies is Dependent on Nucleosynthetic Source
• Impact of the Primordial Stellar Initial Mass Function on the 21-cm Signal
• A needle in a haystack? Catching Pop III stars in the Epoch of Reionization: I. Pop III star forming environments
• Dynamical evolution of Population III stellar systems and the resulting binary statistics
• Following the Cosmic Evolution of Pristine Gas III: The Observational Consequences of the Unknown Properties of Population III Stars
• The Supersonic Project: Shining Light on SIGOs - a New Formation Channel for Globular Clusters
• A self-consistent semi-analytic model for Population III star formation in minihalos
• Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope and Euclid
• Super-Eddington mass growth of intermediate-mass black holes embedded in dusty circumnuclear disks
• Gravitational waves from the remnants of the first stars in nuclear star clusters
• Potential signature of Population III pair-instability supernova ejecta in the BLR gas of the most distant quasar at z = 7.54
• The Effects of Radiative Feedback and Supernova Induced Turbulence on Early Galaxies
• The mass-metallicity relation as a ruler for galaxy evolution: insights from the James Webb Space Telescope
• Global radiation signature from early structure formation
• Impact of Population III homogeneous stellar evolution on early cosmic reionisation
• A hide-and-seek game: Looking for Population III stars during the Epoch of Reionization through the HeII$\lambda$1640 line
• A Metal-Free Galaxy at $z=3.19$? Evidence of Late Population III Star Formation at Cosmic Noon
• The Supersonic Project: To cool or not to cool Supersonically Induced Gas Objects (SIGOs)?
• The THESAN-ZOOM project: Population III star formation continues until the end of reionization
• Extreme Primordial Star Formation Enabled by High Redshift Quasars
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• Radiation magnetohydrodynamics simulations of Population III star formation during the Epoch of Reionization
• Ultraviolet photon production rates of the first stars: Impact on the He II $\lambda$ 1640 Å emission line from primordial star clusters and the 21-cm signal from cosmic dawn
• Type Ia Supernovae from First-generation Stars
• Detectability of Population III stellar remnants as X-ray binaries from tidal captures in the local Universe
• Revealing the formation histories of the first stars with the cosmic near-infrared background
• Challenges in modelling the rest-frame ultraviolet/optical spectra of galaxies at the high-redshift frontier