Inclination Dependence of Lyman-Alpha Properties in a Turbulent Disk Galaxy

TL;DR

This study uses detailed simulations to explore how the inclination angle of a turbulent disk galaxy affects Lyman-Alpha radiation properties, revealing significant variability driven by galaxy morphology and star formation activity.

Contribution

It introduces a comprehensive simulation framework incorporating turbulence, multi-phase ISM, and star formation to analyze inclination effects on Lyman-Alpha emission in disk galaxies.

Findings

Lyman-alpha properties vary significantly with galaxy inclination.

Supernova-driven cavities influence Lyman-alpha escape fractions.

Lyman-alpha emission shows variability linked to star formation activity.

Abstract

We present simulations of Lyman-Alpha radiation transfer in an isolated disk galaxy with a turbulence sub-grid model, multi-phase interstellar medium and detailed star formation modelling. We investigate the influence of inclination on the observed Lyman-Alpha properties for different snapshots. The Lyman-alpha spectrum, equivalent width distribution and escape fractions vary significantly with the detailed morphology of the disk, leading to variations from one snapshot to another. In particular, we find that supernova-driven cavities near star-forming regions in the simulation can dominate the transmitted Lyman-alpha fraction, suggesting a variability of LAEs on the timescales of the star formation activity.