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2008MNRAS.387.1227O - Mon. Not. R. Astron. Soc., 387, 1227-1236 (2008/July-1)
Constraining the mass of the GRB 030329 progenitor.
OSTLIN G., ZACKRISSON E., SOLLERMAN J., MATTILA S. and HAYES M.
Abstract (from CDS):
We have used spectral evolutionary models, including nebular emission, to carefully constrain the age of the stellar population, and hence the progenitor, at the very explosion site. For instantaneous burst models, we find that a population age of ∼5 Myr best matches the data, suggesting a very massive (MZAMS> 50M☉) star as the progenitor, with an upper limit of 8 Myr (MZAMS> 25M☉). For more extended star formation scenarios, the inferred progenitor age is in most cases still very young (<7 Myr, implying MZAMS> 25M☉), with an upper limit of 20 Myr (MZAMS> 12M☉).
These age estimates are an order of magnitude lower than the ages inferred from the overall host galaxy colours, indicating that progenitor mass estimates based on data for spatially unresolved GRB host galaxies will in general be of limited use. Our results are consistent with the collapsar scenario.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): stars: evolution - stars: individual: GRB 030329 - stars: individual: SN 2003dh - galaxies: starburst - galaxies: stellar content - gamma-rays: bursts
Simbad objects: 8
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