Documentation for the intergalactic radiative transfer code IGMtransfer

TL;DR

IGMtransfer is a publicly available numerical code designed to perform intergalactic radiative transfer calculations around the Lyman alpha line, aiding in the study of cosmic reionization through simulation analysis.

Contribution

The paper introduces IGMtransfer, a new code that performs radiative transfer calculations in cosmological simulations with adaptive grids, providing transmission functions and average IGM transmission data.

Findings

Provides detailed transmission functions at various redshifts.

Enables analysis of IGM effects on Lyman alpha line in simulations.

Facilitates studies of cosmic reionization processes.

Abstract

This document describes the publically available numerical code "IGMtransfer", capable of performing intergalactic radiative transfer (RT) of light in the vicinity of the Lyman alpha (Lya) line. Calculating the RT in a (possibly adaptively refined) grid of cells resulting from a cosmological simulation, the code returns 1) a "transmission function", showing how the intergalactic medium (IGM) affects the Lya line at a given redshift, and 2) the "average transmission" of the IGM, making it useful for studying the results of simulations of cosmic reionization.