SEURAT: SPH scheme extended with ultraviolet line radiative transfer

Makito Abe, Hiroyuki Suzuki, Kenji Hasegawa, Benoit Semelin, Hidenobu Yajima, Masayuki Umemura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We present a novel Lyman alpha (Ly a) radiative transfer code, SEURAT (SPH scheme Extended with Ultraviolet line RAdiative Transfer), 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 Lyα radiative transfer with sufficient accuracy. We emphasize that SEURAT can treat the transfer of Lyα photons even in highly complex systems that have significantly inhomogeneous density fields. The high adaptivity of SEURAT is desirable to solve the propagation of Lyα photons in the interstellar medium of young star-forming galaxies like Lyα emitters (LAEs). Thus, SEURAT provides a powerful tool to model the emergent spectra of Lyα emission, which can be compared to the observations of LAEs.

Original languageEnglish
Pages (from-to)2664-2673
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 2018 May 11


  • Galaxies: high-redshift
  • Hydrodynamics
  • Line: profile
  • Methods: numerical
  • Radiative transfer

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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