Chemical properties of long gamma-ray bursts progenitors in cosmological simulations

PELLIZZA, L.J.; ARTALE, CELESTE; TISSERA, PATRICIA B.

Munich

Conferencia; Gamma-Ray Bursts 2012 Conference (GRB 2012); 2012

In this work, we investigate the chemical dependence of the progenitors of long gamma-ray bursts.Using hydrodynamical cosmological simulations consistent with the concordance L-CDM modelwhich include star formation, chemical enrichment and supernova feedback in a self-consistentway, and assuming that these bursts are produced by a subset of massive stars (possibly withdistinct chemical properties), we compute the LGRB rate at different redshifts. Introducing prescriptionsfor their peak isotropic luminosity function and intrinsic spectrum, and using a MonteCarlo scheme to model their detectability by different high-energy observatories, we compute thedistributions of the burst observables (peak flux, spectral peak energy) and compare them to actualdata. Our preliminary results show that a possible chemical dependence for LGRBs progenitorscannot be ruled out, but it might be more complex than the usually assumed metallicity cut-off.