Speaker 1: Mana Ito (extrenal guest, host: Sebastiano Cantalupo)
Title: Predicting Infrared Luminosity Functions of High-Redshift Galaxies with 3D Radiative Transfer Calculations
Abstract: First galaxies played a crucial role in the early universe, contributing to cosmic reionization and the chemical enrichment of the intergalactic medium. Understanding their formation and evolution is therefore essential for unraveling the origins of cosmic structure. Recent advances in submillimeter observations, especially with ALMA, have begun to unveil the dust-obscured star formation activity in high-redshift galaxies, revealing populations that were missed by traditional ultraviolet and optical surveys. However, the number density and infrared luminosity functions of dusty galaxies at high redshifts, especially as traced by dust continuum emission, remain poorly understood from a theoretical perspective.
In this study, we perform radiative transfer calculations of dust thermal emission in the submillimeter regime using the cosmological simulation dataset, FORmation and EVolution of galaxies in Extremely overdense Regions motivated by SSA22 (FOREVER22; Yajima et al. 2022), which is based on a state-of-the-art galaxy formation model. To model the radiative processes within galaxies, we employ the 3D Monte Carlo radiative transfer code, All-wavelength Radiative Transfer with Adaptive Refinement Tree (ART2; Yajima et al. 2012; Li et al. 2008), which self-consistently treats Lyα line and multi-wavelength continuum radiation.
We present theoretical predictions of infrared luminosity functions and dust temperatures in galaxies at redshifts z = 6–12, offering insights into the evolution of galaxy luminosities and dust properties in the early universe. These predictions provide theoretical insights for upcoming deep galaxy surveys and contribute to our understanding of early galaxy evolution. In this talk, I will introduce our results and discuss their implications for the consistency between theoretical models and current/future observations of high-redshift dusty galaxies.