2002, ISBN: 1581121695

[EAN: 9781581121698], Neubuch, [PU: Dissertation.Com. - DO NOT USE], nach der Bestellung gedruckt Neuware -The various possibilities for the origin ('progenitors') of gamma-ray bursts (GR… More...

[EAN: 9781581121698], Neubuch, [PU: Dissertation.Com. - DO NOT USE], nach der Bestellung gedruckt Neuware -The 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 normal 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 supernovae 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 supernovae and implicate massive stars as the progenitors of at least some long-duration GRBs. 200 pp. Englisch, Books<

ISBN: 9781581121698

Paperback, [PU: Dissertation.Com. - DO NOT USE], The various possibilities for the origin ("progenitors") of gamma-ray bursts (GRBs) manifest in differing observable properties. Through d… More...

Paperback, [PU: Dissertation.Com. - DO NOT USE], The 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 normal 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 supernovae 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 supernovae and implicate massive stars as the progenitors of at least some long-duration GRBs., Astrophysics<

ISBN: 9781581121698

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 27.99 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik, Medien > Bücher nein Buch (kartoniert) Hardcove… More...

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 27.99 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik, Medien > Bücher nein Buch (kartoniert) Hardcover;Naturwissenschaften, Medizin, Informatik, Technik;Physik, Astronomie, Dissertation.Com. - DO NOT USE<

ISBN: 9781581121698

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 28.49 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik, Medien > Bücher nein Buch (kartoniert) Hardcove… More...

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 28.49 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik, Medien > Bücher nein Buch (kartoniert) Hardcover;Naturwissenschaften, Medizin, Informatik, Technik;Physik, Astronomie, Dissertation.Com. - DO NOT USE<

ISBN: 1581121695

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 28.99 € als Taschenbuch: . Aus dem Bereich: Bücher, English, International, Englische Taschenbücher, Dissertation.Com. - … More...

Toward an Understanding of the Progenitors of Gamma-Ray Bursts ab 28.99 € als Taschenbuch: . Aus dem Bereich: Bücher, English, International, Englische Taschenbücher, Dissertation.Com. - DO NOT USE<