INVESTIGADORES
PELLIZZA GONZALEZ Leonardo Javier
artículos
Título:
Chemical abundances and spatial distribution of long gamma-ray bursts
Autor/es:
ARTALE, M. C.; PELLIZZA, L. J.; TISSERA, P. B.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2011 vol. 415 p. 3417 - 3422
ISSN:
0035-8711
Resumen:
We analyse the spatial distribution within host galaxies and chemical
properties of the progenitors of long gamma-ray bursts (LGRBs) 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, LGRBs tend
to be [Fe/H]-poor and show a strong α-enhancement evolution
towards lower values as redshift decreases. The variation of typical
burst sites with redshift would imply that they might be tracing
different parts of galaxies at different redshifts.