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Query: journal id: "astrophysicalxjournal"

AuthorsG.C. McLaughlin, R.A.M.J. Wijers
TitleDelayed nickel decay in gamma-ray bursts
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
KeywordsGamma ray bursts
AbstractRecently observed emission lines in the X-ray afterglow of gamma-ray bursts suggest that iron-group elements are either produced in the gamma-ray burst or are present nearby. If this material is the product of a thermonuclear burn, then such material would be expected to be rich in nickel-56. If the nickel remains partially ionized, this prevents the electron capture reaction normally associated with the decay of nickel-56, dramatically increasing the decay timescale. Here we examine the consequences of rapid ejection of a fraction of a solar mass of iron-group material from the center of a collapsar/hypernova. The exact rate of decay then depends on the details of the ionization and, therefore, the ejection process. Future observations of iron, nickel, and cobalt lines can be used to diagnose the origin of these elements and to better understand the astrophysical site of gamma-ray bursts. In this model, the X-ray lines of these iron-group elements could be detected in suspected hypernovae that did not produce an observable gamma-ray burst due to beaming.
Note©2002 American Astronomical Society
Document typeArticle
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