Escape of ionizing radiation from star forming regions in young galaxies

Abstract

Using results from high-resolution galaxy formation simulations in a standard Lambda-CDM cosmology and a fully conservative multi-resolution radiative transfer code around point sources, we compute the energy-dependent escape fraction of ionizing photons from a large number of star forming regions in two galaxies at five different redshifts from z=3.8 to 2.39. All escape fractions show a monotonic decline with time, from (at the Lyman-limit) ~6-10% at z=3.6 to ~1-2% at z=2.39, due to higher gas clumping at lower redshifts. It appears that increased feedback can lead to higher f_esc at z>3.4 via evacuation of gas from the vicinity of star forming regions and to lower f_esc at z<2.39 through accumulation of swept-up shells in denser environments. Our results agree well with the observational findings of \citet{inoue..06} on redshift evolution of f_esc in the redshift interval z=2-3.6.

four pages, four figures, submitted to ApJL

References in corpus (3)

• Cosmological Radiative Transfer Codes Comparison Project I: The Static Density Field Tests
• Where are the ``Missing'' Galactic Baryons?
• Tracing early structure formation with massive starburst galaxies and their implications for reionization

Cited by in corpus (62)

• The Birth of a Galaxy - III. Propelling reionisation with the faintest galaxies
• The observed ionization rate of the intergalactic medium and the ionizing emissivity at z >5: Evidence for a photon starved and extended epoch of reionization
• Galaxy Formation Theory
• Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
• Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
• Ionizing Photon Escape Fractions from High Redshift Dwarf Galaxies
• Escape of Ionizing Radiation from High Redshift Galaxies
• Keeping the Universe ionised: Photo-heating and the clumping factor of the high-redshift intergalactic medium
• Resolving the Formation of Protogalaxies. II. Central Gravitational Collapse
• The First Billion Years Project: The escape fraction of ionizing photons in the epoch of reionization
• Galaxy Properties and UV Escape Fractions During Epoch of Reionization: Results from the Renaissance Simulations
• Escape fraction of ionizing photons from high-redshift galaxies in cosmological SPH simulations
• Intergalactic Transmission and its Impact on the Lyα Line
• Lyman alpha Radiative Transfer with Dust: Escape Fractions from Simulated High-Redshift Galaxies
• A Deep HST Search for Escaping Lyman Continuum Flux at z~1.3: Evidence for an Evolving Ionizing Emissivity
• GeV Gamma-Ray Attenuation and the High-Redshift UV Background
• Ionizing radiation from z=4-10 galaxies
• Lyman alpha Resonant Scattering in Young Galaxies - Predictions from Cosmological Simulations
• TRAPHIC - Radiative Transfer for Smoothed Particle Hydrodynamics Simulations
• A Deep Hubble and Keck Search for Definitive Identification of Lyman Continuum Emitters at z~3.1
• New Insights into the Evolution of Massive Stars and Their Effects on Our Understanding of Early Galaxies
• Radiative Feedback from high mass X-ray binaries on the formation of the first galaxies and early reionization
• Lyman alpha Radiative Transfer in Cosmological Simulations using Adaptive Mesh Refinement
• Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts
• The escape fraction of ionizing photons from high redshift galaxies from data-constrained reionization models
• Kinematics of massive star ejecta in the Milky Way as traced by 26Al
• A Monte Carlo simulation of the intergalactic absorption and the detectability of the Lyman continuum from distant galaxies
• The visibility of Lyman Alpha Emitters during reionization
• The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
• Spatially adaptive radiation-hydrodynamical simulations of galaxy formation during cosmological reionization
• Dissecting the Gaseous Halos of z~2 Damped Ly$\alpha$ Systems with Close Quasar Pairs
• The Effect of Galactic Properties on the Escape Fraction of Ionizing Photons
• On the Evolution of the Cosmic Ionizing Background
• Intergalactic Lyman continuum photon budget in the past 5 billion years
• Runaway Stars and the Escape of Ionizing Radiation from High-Redshift Galaxies
• Lyman continuum galaxies and the escape fraction of Lyman break galaxies
• The escape of ionizing photons from supernova-dominated primordial galaxies
• The escape of ionising radiation from high-redshift dwarf galaxies
• A suppressed contribution of low mass galaxies to reionization due to supernova feedback
• Properties of QSO Metal Line Absorption Systems at High Redshifts: Nature and Evolution of the Absorbers and New Evidence on Escape of Ionizing Radiation from Galaxies
• The nature of HI absorbers in GRB afterglows: clues from hydrodynamic simulations
• Winds of change: reionization by starburst galaxies
• The visibility of Lyman Alpha Emitters: constraining reionization, ionizing photons and dust
• Lyman "bump" galaxies - I. Spectral energy distribution of galaxies with an escape of nebular Lyman continuum
• Are There Enough Ionizing Photons to Reionize the Universe by z=6?
• Chasing Lyman alpha-emitting galaxies at z = 8.8
• Lyman `bump' galaxies - II. A possible signature of massive extremely metal-poor or metal-free stars in z=3.1 Ly-alpha emitters
• Coincident, 100 kpc-scale damped Lyman alpha absorption towards a binary QSO: how large are galaxies at z ~ 3?
• Determining the escape fraction of ionizing photons during reionization with the GRB derived star-formation rate
• Effect of Intergalactic Medium on the Observability of Lyman Alpha Emitters during Cosmic Reionization
• Modeling Lyman continuum emission from young galaxies
• Probing high-redshift galaxies with Ly$\alpha$ intensity mapping
• Where are the Cosmic Metals at z~3?
• Can gravitational infall energy lead to the observed velocity dispersion in DLAs?
• A Physical Model of Lyman Alpha Emitters
• Influence of ~7 keV sterile neutrino dark matter on the process of reionization
• Using Artificial Neural Networks to Constrain the Halo Baryon Fraction during Reionization
• The escape fraction of ionizing photons from high redshift galaxies
• Cosmic histories of star formation and reionization: An analysis with a power-law approximation
• Investigating the effect of cosmic opacity on standard candles
• Cosmic reionization of hydrogen and helium: contribution from both mini-quasars and stars
• Impact of anisotropic photon emission from sources during the epoch of reionisation