Emission line galaxies around protoclusters in a galaxy formation model

T. HOUGH; S. GURUNG-LÓPEZ; A. ORSI; S. A. CORA

Viedma

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2019

Galaxies exhibiting Halpha (HAEs) and Lyalpha (LAEs) emission lines are one of the most important tracers of the high redshift Universe in modern astrophysics. They often probe high density environments, as protoclusters, which are the seeds of the most massive clusters of galaxies (M > 10^14 Msun ) at the present epoch. Studying the properties of emission-line galaxies in these environments is key to understand aspects of the formation and evolution of galaxies. Protoclusters are also embedded in the intergalactic medium (IGM), which can scatter the Lyalpha photons. In the present work we use the GALFORM semi-analytic model of galaxy formation and evolution to analize how he radiative transfer of Ly photons inside the inter-stellar medium (ISM) and IGM shapes the spatial distribution of emission-line galaxies at high redshift. We found that LAEs do not avoid dense regions at z = 2.2, and can trace same densities as HAEs. We also found that the presence of the inter-galactic medium slightly diminish the clustering of LAEs at z > 2.