Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa) III Simulation for H$\alpha$ from Galaxies and the Intergalactic Medium during the Epoch of Reionization

Abstract

The evolution of large-scale structure, galaxies and the intergalactic medium (IGM) during the Epoch of Reionization (EoR) can be probed by upcoming Line Intensity Mapping (LIM) experiments, which sample in redshift and direction without needing to resolve individual galaxies. We predict the intensity and sources of hydrogen H$\alpha$ emission, dominated by radiative recombination following ionization by UV from the same massive stars that caused reionization, down to redshift 4.6, using the largest fully-coupled, radiation-hydro simulation of galaxy formation and reionization to date, Cosmic Dawn (CoDa) III. We compute the mean intensity and Voxel Intensity Distribution (VID) vs. redshift, including the relative contributions of galaxies and IGM. This will provide mock data to guide and interpret LIM experiments such as NASA's SPHEREx and proposed Cosmic Dawn Intensity Mapper (CDIM).

4 pages, 1 figure, published in RNAAS

References in corpus (11)

• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Cosmic Dawn (CoDa): the First Radiation-Hydrodynamics Simulation of Reionization and Galaxy Formation in the Local Universe
• A radiative transfer scheme for cosmological reionization based on a local Eddington tensor
• Redshift Space Distortion of the 21cm Background from the Epoch of Reionization I: Methodology Re-examined
• The THESAN project: predictions for multi-tracer line intensity mapping in the epoch of reionization
• The short ionizing photon mean free path at z=6 in Cosmic Dawn III, a new fully-coupled radiation-hydrodynamical simulation of the Epoch of Reionization
• Intensity mapping of H-alpha, H-beta, [OII] and [OIII] lines at z<5
• Insights from probability distribution functions of intensity maps
• History of Hydrogen Reionization in the Cold Dark Matter Model
• DUSTiER (DUST in the Epoch of Reionization): dusty galaxies in cosmological radiation-hydrodynamical simulations of the Epoch of Reionization with RAMSES-CUDATON
• LIMFAST. I. A Semi-Numerical Tool for Line Intensity Mapping

Cited by in corpus (2)

• oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
• Simulation based inference of the ionization history from the 2D 21 cm power spectrum