Outliers from the mainstream: how a massive star can produce a gamma-ray burst

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dc.creatorCampana, S.
dc.creatorPanagia, N.
dc.creatorLazzati, D.
dc.creatorBeardmore, A. P.
dc.creatorCusumano, G.
dc.creatorGodet, O.
dc.creatorChincarini, G.
dc.creatorCovino, S.
dc.creatorDella Valle, M.
dc.creatorGuidorzi, C.
dc.creatorMalesani, D.
dc.creatorMoretti, A.
dc.creatorPerna, R.
dc.creatorRomano, P.
dc.creatorTagliaferri, G.
dc.date2008-05-30
dc.date.accessioned2026-07-07T13:12:47Z
dc.date.available2026-07-07T13:12:47Z
dc.descriptionIt is now recognized that long-duration Gamma-Ray Bursts (GRBs) are linked to the collapse of massive stars, based on the association between (low-redshift) GRBs and (type Ic) core-collapse supernovae (SNe). The census of massive stars and GRBs reveals, however, that not all massive stars do produce a GRB. Only ~1% of core collapse SNe are able to produce a highly relativistic collimated outflow, and hence a GRB. The extra crucial parameter has long been suspected to be metallicity and/or rotation. We find observational evidence strongly supporting that both ingredients are necessary in order to make a GRB out of a core-collapsing star. A detailed study of the absorption pattern in the X-ray spectrum of GRB060218 reveals evidence of material highly enriched in low atomic number metals ejected before the SN/GRB explosion. We find that, within the current scenarios of stellar evolution, only a progenitor star characterized by a fast stellar rotation and sub-solar initial metallicity could produce such a metal enrichment in its close surrounding.
dc.descriptionApJL in press 4 pages 2 figures
dc.identifierhttps://arxiv.org/abs/0805.4698
dc.identifierhttp://arxiv.org/abs/0805.4698
dc.identifierAstrophys. J. 683 (2008) L9-L12
dc.identifierdoi:10.1086/591421
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229680
dc.subjectAstrophysics
dc.titleOutliers from the mainstream: how a massive star can produce a gamma-ray burst
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