The observational signature of the first H II regions

Abstract

We use three-dimensional smoothed particle hydrodynamics simulations together with a dynamical ray-tracing scheme to investigate the build-up of the first H ii regions around massive Population III stars in minihaloes. We trace the highly anisotropic breakout of the ionising radiation into the intergalactic medium, allowing us to predict the resulting recombination radiation with greatly increased realism. Our simulations, together with Press-Schechter type arguments, allow us to predict the Population III contribution to the radio background at 100 MHz via bremsstrahlung and 21 cm emission. We find a global bremsstrahlung signal of around 1 mK, and a combined 21 cm signature which is an order of magnitude larger. Both might be within reach of the planned Square Kilometer Array experiment, although detection of the free-free emission is only marginal. The imprint of the first stars on the cosmic radio background might provide us with one of the few diagnostics to test the otherwise elusive minihalo star formation site.

13 pages, 7 figures, published in MNRAS

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• The spectral evolution of the first galaxies. I. James Webb Space Telescope detection limits and color criteria for population III galaxies
• Building up the Population III initial mass function from cosmological initial conditions
• The First Galaxies: Chemical Enrichment, Mixing, and Star Formation
• The First Stars: Mass Growth Under Protostellar Feedback
• Limiting Accretion onto Massive Stars by Fragmentation-Induced Starvation
• The generation of strong magnetic fields during the formation of the first stars
• Constraining the Statistics of Population III Binaries
• Connecting the first galaxies with ultra faint dwarfs in the Local Group: chemical signatures of Population~III stars
• Rotation Speed of the First Stars
• Gamma-ray Burst Cosmology
• The First Galaxies: Assembly with Black Hole Feedback
• Radiative Feedback from high mass X-ray binaries on the formation of the first galaxies and early reionization
• Accretion onto black holes formed by direct collapse
• Supermassive Black Hole Formation at High Redshifts via Direct Collapse: Physical Processes in the Early Stage
• Star Formation in the First Galaxies I: Collapse Delayed by Lyman-Werner Radiation
• The First Galaxies: Assembly of Disks and Prospects for Direct Detection
• Recovery from population III supernova explosions and the onset of second generation star formation
• Probing Pre-galactic Metal Enrichment with High-Redshift Gamma-Ray Bursts
• Monte Carlo Radiation Hydrodynamics with Implicit Methods
• The First Stars: A Low-Mass Formation Mode
• Detection of isolated population III stars with the James Webb Space Telescope
• Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization
• The first galaxies: simulating their feedback-regulated assembly
• Detecting gravitationally lensed population III galaxies with the Hubble Space Telescope and the James Webb Space Telescope
• The role of faint population III supernovae in forming CEMP stars in ultra-faint dwarf galaxies
• Characterization of Population III Stars with Stellar Atmosphere and Evolutionary Modeling and Predictions of their Observability with the James Webb Space Telescope
• Magnetic fields in the formation of the first stars.--II Results
• The First Stars: formation under X-ray feedback
• The Mutual Interaction Between Population III Stars and Self-Annihilating Dark Matter
• Highly r-process enhanced stars in ultra-faint dwarf galaxies
• Signature of the first galaxies in JWST deep field observations
• Formation of N-rich field stars in the high-density building blocks of the Galactic bulge
• The Dark Ages of the Universe and Hydrogen Reionization
• Global radiation signature from early structure formation
• The HST colours of high-redshift population III galaxies with strong Lyman alpha emission
• The First Stars: formation under cosmic ray feedback
• On the operation of the chemothermal instability in primordial star-forming clouds
• Cosmological Impact of Population III Binaries
• Formation of globular clusters with internal abundance spreads in r-process elements: strong evidence for prolonged star formation
• Effect of lithium hydride on the cooling of primordial gas
• GRBs and fundamental physics
• Probing the assembly of dwarf galaxies through cosmic time with damped Lyman-$\alpha$ absorption spectroscopy
• Instabilities in the Ionization Zones Around the First Stars
• Exploring effects of IMF sampling and SN feedback injection on star formation and metallicity in ultra-faint dwarf galaxies
• Supernovae at the cosmic dawn
• Probing the very high redshift Universe with Gamma-ray Bursts: prospects for observations with future X-ray instruments
• Detailed Abundance Determination of Metal-Poor Stars with X-Shooter I. Unusual Chemistry in Halo Stars