Chemical abundances and spatial distribution of Long Gamma-Ray Bursts

Abstract

We analyse the spatial distribution within host galaxies and chemical properties of the progenitors of Long Gamma Ray Bursts as a function of redshift. By using hydrodynamical cosmological simulations which include star formation, Supernova feedback and chemical enrichment and based on the hypothesis of the collapsar model with low metallicity, we investigate the progenitors in the range 0 < z < 3. Our results suggest that the sites of these phenomena tend to be located in the central regions of the hosts at high redshifts but move outwards for lower ones. We find that scenarios with low metallicity cut-offs best fit current observations. For these scenarios Long Gamma Ray Bursts tend to be [Fe/H] poor and show a strong alpha-enhancement evolution towards lower values as redshift decreases. The variation of typical burst sites with redshift would imply that they might be tracing different part of galaxies at different redshifts.

7 pages, 5 figures, accepted for publication in MNRAS

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Cited by in corpus (5)

• Are LGRBs biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs. I: Stellar mass at z<1
• The metallicity properties of simulated long-GRB galaxy hosts and the Fundamental Metallicity Relation
• The metallicity and star formation activity of long gamma-ray burst hosts for z$<$3: insights from the Illustris simulation
• Non-parametric Morphologies of Mergers in the Illustris Simulation
• The First Billion Years project: gamma-ray bursts at z>5