Tracing the Formation History of Intrahalo Light with Horizon Run 5
Hyungjin Joo (Yonsei University, Seoul, South Korea), M. James Jee (Yonsei University, Seoul, South Korea), Juhan Kim (Korea Institute for Advanced Study, Seoul, South Korea), Jaehyun Lee (Korea Institute for Advanced Study, Seoul, South Korea), Jongwan Ko (Korea Astronomy and Space Science Institute, Daejeon, South Korea), Changbom Park (Korea Institute for Advanced Study, Seoul, South Korea), Jihye Shin (Korea Astronomy and Space Science Institute, Daejeon, South Korea), Owain Snaith (Observatoire de Paris, Meudon, France), Christophe Pichon (Sorbonne Universit’e, Institut d’Astrophysique de Paris, France), Brad Gibson (University of Hull, Hull, Kingston upon Hull, GB), Yonghwi Kim (Korea Institute of Science and Technology Information, Daejeon, South Korea)
arXiv:2411.08117v2 Announce Type: replace
Abstract: We investigate the formation history of intrahalo light (IHL) using the high-resolution (~1 kpc), large-scale (~Gpc) cosmological hydrodynamical simulation, Horizon Run 5 (HR5). IHL particles are identified by carefully considering both their binding energies and positions with respect to the tidal radii of individual galaxies. By analyzing more than 1,200 galaxy groups and clusters with $geq 10^{13} M_{odot}$ and tracing their individual IHL particles back in time, we classify the origin of each IHL particle at each epoch based on the status of the originating galaxy into three categories: brightest halo galaxy (BHG) formation/merger, satellite galaxy stripping, and pre-processing. Our study reveals that the IHL production through BHG formation/merger is the predominant production channel, contributing over 60% of the total IHL mass across all redshifts. The second most significant IHL production channel is pre-processing, providing more than 20% in the final HR5 snapshot. Stripping is negligible at $z>4$ but becomes gradually more important as halos mature at $zarXiv:2411.08117v2 Announce Type: replace
Abstract: We investigate the formation history of intrahalo light (IHL) using the high-resolution (~1 kpc), large-scale (~Gpc) cosmological hydrodynamical simulation, Horizon Run 5 (HR5). IHL particles are identified by carefully considering both their binding energies and positions with respect to the tidal radii of individual galaxies. By analyzing more than 1,200 galaxy groups and clusters with $geq 10^{13} M_{odot}$ and tracing their individual IHL particles back in time, we classify the origin of each IHL particle at each epoch based on the status of the originating galaxy into three categories: brightest halo galaxy (BHG) formation/merger, satellite galaxy stripping, and pre-processing. Our study reveals that the IHL production through BHG formation/merger is the predominant production channel, contributing over 60% of the total IHL mass across all redshifts. The second most significant IHL production channel is pre-processing, providing more than 20% in the final HR5 snapshot. Stripping is negligible at $z>4$ but becomes gradually more important as halos mature at $z