Achievements & Publications

Discrimination of heavy elements originating from Pop III stars in z = 3 intergalactic medium

Kirihara, Takanobu,   Hasegawa, Kenji,   Umemura, Masayuki,   Mori, Masao,   & Ishiyama, Tomoaki


Abstract
We investigate the distribution of metals in the cosmological volume at z \ensuremath∼ 3, in particular, provided by massive Population III (Pop III) stars using a cosmological N-body simulation in which a model of Pop III star formation is implemented. Owing to the simulation, we can choose minihaloes where Pop III star formation occurs at z > 10 and obtain the spatial distribution of the metals at lower redshifts. To evaluate the amount of heavy elements provided by Pop III stars, we consider metal yield of pair-instability or core-collapse supernovae (SNe) explosions of massive stars. By comparing our results to the Illustris-1 simulation, we find that heavy elements provided by Pop III stars often dominate those from galaxies in low-density regions. The median value of the volume averaged metallicity is Z̃ 10\̂-4.5 - -2\ Z_\☉ \ at the regions. Spectroscopic observations with the next generation telescopes are expected to detect the metals imprinted on quasar spectra.




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