The physics of Lyman-alpha escape from disc-like galaxies

Abstract

Hydrogen emission lines can provide extensive information about star-forming galaxies in both the local and high-redshift Universe. We present a detailed Lyman continuum (LyC), Lyman-alpha (Lyα), and Balmer line (Hα and H\b{eta}) radiative transfer study of a high-resolution isolated Milky-Way simulation using the Arepo-RT radiation hydrodynamics code with the SMUGGLE galaxy formation model. The realistic framework includes stellar feedback, non-equilibrium thermochemistry, and dust grain evolution in the interstellar medium (ISM). We extend our Cosmic Lyα Transfer (COLT) code with photoionization equilibrium Monte Carlo radiative transfer for self-consistent end-to-end (non-)resonant line predictions. Accurate LyC reprocessing to recombination emission requires modelling pre-absorption by dust (27.5%), helium ionization (8.7%), and anisotropic escape fractions (7.9%), as these reduce the available budget for hydrogen line emission (55.9%). We investigate the role of the multiphase dusty ISM, disc geometry, gas kinematics, and star formation activity in governing the physics of emission and escape, focusing on the time variability, gas phase structure, and spatial, spectral, and viewing angle dependence of the emergent photons. Isolated disc simulations are well-suited for comprehensive observational comparisons with local Hα surveys, but would require a proper cosmological circumgalactic medium (CGM) environment as well as less dust absorption and rotational broadening to serve as analogs for high-redshift Lyα emitting galaxies. Future applications of our framework to next-generation cosmological simulations of galaxy formation including radiation-hydrodynamics that resolve <10 pc multiphase ISM and <1 kpc CGM structures will provide crucial insights and predictions for current and upcoming Lyα observations.

arXiv comment28 pages, 32 figures, MNRAS, in press

References in corpus (151)

• Stellar population synthesis at the resolution of 2003
• Star Formation in the Milky Way and Nearby Galaxies
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Modeling feedback from stars and black holes in galaxy mergers
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation
• Cosmological Simulations with TreeSPH
• Equation of State of the Photoionized Intergalactic Medium
• Theoretical Challenges in Galaxy Formation
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• The Evolution of the Elemental Abundances in the Gas and Dust Phases of the Galaxy
• Comparison of H-alpha and UV Star Formation Rates in the Local Volume: Systematic Discrepancies for Dwarf Galaxies
• Understanding Galaxy Evolution through Emission Lines
• On the evolution of the HI column density distribution in cosmological simulations
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• The Arepo public code release
• The Birth of a Galaxy - III. Propelling reionisation with the faintest galaxies
• Smoothed Particle Hydrodynamics in Astrophysics
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• RAMSES-RT: Radiation hydrodynamics in the cosmological context
• Lyman Alpha Radiation From Collapsing Protogalaxies I: Characteristics of the Emergent Spectrum
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• Ionizing Photon Escape Fractions from High Redshift Dwarf Galaxies
• Extreme Feedback and the Epoch of Reionization: Clues in the Local Universe
• Escape of Ionizing Radiation from High Redshift Galaxies
• Where stars form: inside-out growth and coherent star formation from HST Halpha maps of 2676 galaxies across the main sequence at z~1
• Ly$\alpha$ emission from Green Peas: the role of circumgalactic gas density, covering, and kinematics
• Lyman Alpha Radiative Transfer in a Multi-Phase Medium
• Star-Forming Galaxies at Cosmic Noon
• Introducing the THESAN project: radiation-magnetohydrodynamic simulations of the epoch of reionization
• Metal Enrichment of the Intergalactic Medium in Cosmological Simulations
• Lyman-alpha Cooling Emission from Galaxy Formation
• The First Billion Years Project: The escape fraction of ionizing photons in the epoch of reionization
• On Radiation Pressure in Static, Dusty HII Regions
• Observations of the Lyman-$\alpha$ Universe
• Ly$\alpha$ profile, dust, and prediction of Ly$\alpha$ escape fraction in Green Pea Galaxies
• Scattered Lyman-alpha Radiation Around Sources Before Cosmological Reionization
• Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionisation
• Monte Carlo Simulation of Lyman Alpha Scattering and Application to Damped Lyman Alpha Systems
• On the Escape of Ionizing Radiation from Starbursts
• SDSS IV MaNGA - sSFR profiles and the slow quenching of discs in green valley galaxies
• The Dust-to-Gas and Dust-to-Metals Ratio in Galaxies from z=0-6
• Star formation is boosted (and quenched) from the inside out: radial star formation profiles from MaNGA
• The Spectroscopic Properties of Lyα-Emitters at z $\approx$ 2.7: Escaping Gas and Photons from Faint Galaxies
• Nearly all the sky is covered by Lyman-alpha emission around high redshift galaxies
• Dust Formation in Milky Way-like Galaxies
• The Difficulty of Getting High Escape Fractions of Ionizing Photons from High-redshift Galaxies: a View from the FIRE Cosmological Simulations
• The LyA-LyC Connection: Evidence for an Enhanced Contribution of UV-faint Galaxies to Cosmic Reionization
• Lyman-alpha emission properties of simulated galaxies: interstellar medium structure and inclination effects
• Simulating the dust content of galaxies: successes and failures
• The MOSDEF Survey: Dissecting the star-formation rate vs. stellar mass relation using H$\alpha$ and H$\beta$ emission lines at z ~ 2
• Lyman continuum leakage from low-mass galaxies with Mstar < 1.E8 Msun
• Simulating the interstellar medium and stellar feedback on a moving mesh: Implementation and isolated galaxies
• The evolution of superbubbles and the detection of Lyman alpha in star-forming galaxies
• No missing photons for reionization: moderate ionizing photon escape fractions from the FIRE-2 simulations
• The Lyman alpha Reference Sample: Extended Lyman alpha Halos Produced at Low Dust Content
• A tale of two DIGs: The relative role of HII regions and low-mass hot evolved stars in powering the diffuse ionised gas (DIG) in PHANGS-MUSE galaxies
• Ly-alpha Radiative Transfer in Cosmological Simulations and Application to a z~8 Emitter
• The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies
• Accurately predicting the escape fraction of ionizing photons using restframe ultraviolet absorption lines
• Line Transfer through Clumpy, Large-Scale Outflows: Lyman Alpha Absorption and Halos around Starforming Galaxies
• The Lyman Alpha Reference Sample: V. The impact of neutral ISM kinematics and geometry on Lyman Alpha escape
• New Insights on Ly-alpha and Lyman Continuum Radiative Transfer in the Greenest Peas
• AREPO-RT: Radiation hydrodynamics on a moving mesh
• Simulating galactic dust grain evolution on a moving mesh
• Understanding the escape of LyC and Ly$\alpha$ photons from turbulent clouds
• The origin of the escape of Lyman alpha and ionizing photons in Lyman Continuum Emitters
• The physics of Lyman-alpha escape from high-redshift galaxies
• Rotational Disruption of Dust Grains by Radiative Torques in Strong Radiation Fields
• The Kinematics of Multiple-Peaked Ly-alpha Emission in Star-Forming Galaxies at z~2-3
• The SILCC project --- IV. Impact of dissociating and ionising radiation on the interstellar medium and Halpha emission as a tracer of the star formation rate
• Supernova feedback in numerical simulations of galaxy formation: separating physics from numerics
• A Model for the Scattered Light Contribution and Polarization of the Diffuse H$\alpha$ Galactic Background
• Lyman Radiation Hydrodynamics of Turbulent H II Regions in Molecular Clouds: A Physical Origin of LyC Leakage and the Associated Ly$\alpha$ Spectra
• A systematic study of Lyman-Alpha transfer through outflowing shells: Model parameter estimation
• On the (non-)enhancement of the Lyman α equivalent width by a multiphase interstellar medium
• The THESAN project: Lyman-alpha emission and transmission during the Epoch of Reionization
• Interstellar Grains in Elliptical Galaxies: Grain Evolution
• Cosmological simulation with dust formation and destruction
• The effect of dust geometry on the Lyman-alpha output of galaxies
• Lyman alpha Radiative Transfer in Cosmological Simulations using Adaptive Mesh Refinement
• Beamed Lyman Alpha Emission through Outflow-Driven Cavities
• Neutral gas properties of Lyman continuum emitting galaxies: column densities and covering fractions from UV absorption lines
• Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54
• Probing Cosmic Dawn with Emission Lines: Predicting Infrared and Nebular Line Emission for ALMA and JWST
• Lyman alpha Emitting Galaxies in the Nearby Universe
• Lyman-alpha line and continuum radiative transfer in a clumpy interstellar medium
• H-alpha emission in local galaxies: star formation, time variability and the diffuse ionized gas
• The Lyman-alpha signature of the first galaxies
• Puzzling Lyman-alpha line profiles in green pea galaxies
• Lya escape from z~0.03 star-forming galaxies: the dominant role of outflows
• Lyman alpha line formation in starbursting galaxies II. Extremely Thick, Dustless, and Static HI Media
• The SINS/zC-SINF Survey of z~2 Galaxy Kinematics: Rest-frame Morphology, Structure, and Colors from Near-infrared Hubble Space Telescope Imaging
• The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
• The Effects of Stellar Population and Gas Covering Fraction on the Emergent Lyman Alpha Emission of High-Redshift Galaxies
• Lyman Continuum Extinction by Dust in H {\sc ii} Regions of Galaxies
• The THESAN project: predictions for multi-tracer line intensity mapping in the epoch of reionization
• Escape of Lyman-alpha and continuum photons from star-forming galaxies
• LYRA I: Simulating the multi-phase ISM of a dwarf galaxy with variable energy supernovae from individual stars
• (Re)Solving Reionization with Lyα: How Bright Lyα Emitters account for the $z\approx 2-8$ Cosmic Ionizing Background
• ART^2 : Coupling Lyman-alpha Line and Multi-wavelength Continuum Radiative Transfer
• Resonant line transfer in a fog: Using Lyman-alpha to probe tiny structures in atomic gas
• The physical origins and dominant emission mechanisms of Lyman-alpha halos: results from the TNG50 simulation in comparison to MUSE observations
• Thermal and nonthermal dust sputtering in hydrodynamical simulations of the multiphase interstellar medium
• Powderday: Dust Radiative Transfer for Galaxy Simulations
• Lyman-$\alpha$ as a tracer of cosmic reionisation in the SPHINX radiation-hydrodynamics cosmological simulation
• The Lyman Continuum Escape Survey: Connecting Time-Dependent [OIII] and [OII] Line Emission with Lyman Continuum Escape Fraction in Simulations of Galaxy Formation
• Simulating the interstellar medium of galaxies with radiative transfer, non-equilibrium thermochemistry, and dust
• UV absorption lines and their potential for tracing the Lyman continuum escape fraction
• Anisotropic Lyman-alpha Emission
• Formation and evolution of young massive clusters in galaxy mergers: the SMUGGLE view
• High redshift JWST predictions from IllustrisTNG: II. Galaxy line and continuum spectral indices and dust attenuation curves
• Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization
• Inclination Dependence of Lyman-Alpha Properties in a Turbulent Disk Galaxy
• Predicting dust extinction properties of star-forming galaxies from H-alpha/UV ratio
• Momentum feedback from marginally-resolved HII regions in isolated disc galaxies
• The effects of subgrid models on the properties of giant molecular clouds in galaxy formation simulations
• Efficacy of early stellar feedback in low gas surface density environments
• WARPFIELD-EMP: The Self-Consistent Prediction of Emission Lines from Evolving HII Regions in Dense Molecular Clouds
• A systematic study of the escape of LyC and Ly$\alpha$ photons from star-forming, magnetized turbulent clouds
• Chasing Lyman alpha-emitting galaxies at z = 8.8
• Diffuse Ionized Gas in Simulations of Multiphase, Star-Forming Galactic Disks
• Nebular Line Emission During the Epoch of Reionization
• Lyα emission from galaxies in the Epoch of Reionization
• Lyman Alpha Reference Sample: X. Predicting Lyman alpha output from starforming galaxies using multivariate regression
• Tracing the simulated high-redshift circum-galactic medium with Lyman alpha emission
• Lyman continuum leaking galaxies - Search strategies and local candidates
• Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and its Hot Corino
• Ly-alpha Radiative Transfer: Monte-Carlo Simulation of the Wouthuysen-Field Effect
• Dwarf Galaxies with Ionizing Radiation Feedback. II: Spatially-resolved Star Formation Relation
• Dust entrainment in galactic winds
• WARPFIELD Population Synthesis: The physics of (extra-)Galactic star formation and feedback driven cloud structure and emission from sub-to-kpc scales
• Radiative effects during the assembly of direct collapse black holes
• Models of Diffuse Hα in the Interstellar Medium: The Relative Contributions from In Situ Ionisation and Dust Scattering
• Revisiting the Gas Kinematics in SSA22 Lyman-$\alpha$ Blob 1 with Radiative Transfer Modeling in a Multiphase, Clumpy Medium
• Lyman-alpha radiative transfer: Modeling spectrum and surface brightness profile of Lyman-alpha emitting galaxies at z=3-6
• Arepo-MCRT: Monte Carlo Radiation Hydrodynamics on a Moving Mesh
• ZELDA: fitting Lyman-alpha line profiles using deep learning
• Effects of Spatial Discretization in Lyman-alpha Line Radiation Transfer Simulations
• High-redshift Galaxy Formation with Self-consistently Modeled Stars and Massive Black Holes: Stellar Feedback and Quasar Growth
• ART${}^2$: A 3D Parallel Multi-wavelength Radiative Transfer Code for Continuum and Atomic and Molecular Lines
• The Origin and Evolution of Lyman-alpha Blobs in Cosmological Galaxy Formation Simulations
• Resonant-line radiative transfer within power-law density profiles
• The Lyman Alpha Reference Sample XII: Morphology of extended Lyman alpha emission in star-forming galaxies
• Lyman-$\alpha$ photons through rotating outflows
• Observations of Ly$\alpha$ Emitters at High Redshift
• The Role of Dust, UV Luminosity and Large-scale Environment on the Escape of Lya Photons: A Case Study of a Protocluster field at z = 3.1
• Simulating Radiative Magnetohydrodynamical Flows with AstroBEAR: Implementation and Applications of Non-equilibrium Cooling

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• Tracing the Origins of Hot Halo Gas in Milky Way-Type Galaxies with SMUGGLE
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• RIGEL: Feedback-regulated cloud-scale star formation efficiency in a simulated dwarf galaxy merger
• Radiative Transfer Simulations of Ly$\alpha$ Intensity Mapping During Cosmic Reionization Including Sources from Galaxies and the Intergalactic Medium
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