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About this product
- DescriptionThe various possibilities for the origin ( progenitors ) of gamma-ray bursts (GRBs) manifest in differing observable properties. Through deep spectroscopic and high-resolution imaging observations of some GRB hosts, I demonstrate that well-localized long-duration GRBs are connected with otherwise rmal star-forming galaxies at moderate redshifts of order unity. Using high-mass binary stellar population synthesis models, I quantify the expected spatial extent around galaxies of coalescing neutron stars, one of the leading contenders for GRB progenitors. I then test this scenario by examining the offset distribution of GRBs about their apparent hosts making extensive use of ground-based optical data from Keck and Palomar and space-based imaging from the Hubble Space Telescope. The offset distribution appears to be inconsistent with the coalescing neutron star binary hypothesis (and, similarly, black-hole--neutron star coalescences); instead, the distribution is statistically consistent with a population of progenitors that closely traces the ultra-violet light of galaxies. This is naturally explained by bursts which originate from the collapse of massive stars collapsars''). This claim is further supported by the unambiguous detections of intermediate-time (approximately three weeks after the bursts) emission bumps'' which appear substantially more red than the afterglows themselves. I claim that these bumps could originate from supervae that occur at approximately the same time as the associated GRB; if true, GRB 980326 and GRB 011121 provide strong observational evidence connecting cosmological GRBs to high-redshift supervae and implicate massive stars as the progenitors of at least some long-duration GRBs.
- Author(s)Joshua S Bloom
- Date of Publication12/11/2002
- FormatPaperback / softback
- Country of PublicationUnited States
- Content Noteblack & white illustrations
- Weight259 g
- Width140 mm
- Height216 mm
- Spine12 mm
- Format DetailsTrade paperback (US),Unsewn / adhesive bound
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