SEURAT: SPH scheme extended with ultraviolet line radiative transfer

Abstract

We present a novel Lyman alpha (Ly$\alpha$) radiative transfer code, SEURAT, where line scatterings are solved adaptively with the resolution of the smoothed particle hydrodynamics (SPH). The radiative transfer method implemented in SEURAT is based on a Monte Carlo algorithm in which the scattering and absorption by dust are also incorporated. We perform standard test calculations to verify the validity of the code; (i) emergent spectra from a static uniform sphere, (ii) emergent spectra from an expanding uniform sphere, and (iii) escape fraction from a dusty slab. Thereby we demonstrate that our code solves the Ly$\alpha$ radiative transfer with sufficient accuracy. We emphasise that SEURAT can treat the transfer of Ly$\alpha$ photons even in highly complex systems that have significantly inhomogeneous density fields. The high adaptivity of SEURAT is desirable to solve the propagation of Ly$\alpha$ photons in the interstellar medium of young star-forming galaxies like Ly$\alpha$ emitters (LAEs). Thus, SEURAT provides a powerful tool to model the emergent spectra of Ly$\alpha$ emission, which can be compared to the observations of LAEs.

11 pages, 10 figures, accepted for publication in MNRAS

References in corpus (15)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Properties of galaxies reproduced by a hydrodynamic simulation
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• The End of the Reionization Epoch Probed by Ly-alpha Emitters at z=6.5 in the Subaru Deep Field
• A galaxy at a redshift z = 6.96
• Accelerated Evolution of Ly$\alpha$ Luminosity Function at $\text{z}\gtrsim 7$ Revealed by the Subaru Ultra-Deep Survey for Ly$\alpha$ Emitters at $\text{z}=7.3$
• The Impact of The IGM on High-Redshift Lyman Alpha Emission Lines
• 3D Lyman-alpha radiation transfer. III. Constraints on gas and stellar properties of z~3 Lyman break galaxies (LBG) and implications for high-z LBGs and Lyman-alpha emitters(LAEs)
• TRAPHIC - Radiative Transfer for Smoothed Particle Hydrodynamics Simulations
• On the Detectability of Lyman-alpha Emission in Star-forming Galaxies: The Role of Dust
• The simulated 21 cm signal during the epoch of reionization : full modeling of the Ly-alpha pumping
• Lyman-alpha radiative transfer during the Epoch of Reionization: contribution to 21-cm signal fluctuations
• The Lyman-alpha signature of the first galaxies
• SPHRAY: A Smoothed Particle Hydrodynamics Ray Tracer for Radiative Transfer