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The diversity of stellar death is revealed in the energy, velocity and geometry of the explosion debris ("ejecta''). Using multi-wavelength observations of gamma-ray burst (GRB) afterglows I show that GRBs, arising from the death of massive stars, are marked by relativistic, collimated ejecta ("jets'') with a wide range of opening angles. These results suggest that various cosmic explosions are powered by a common energy source, an "engine'' (possibly an accreting stellar-mass black hole), with their diverse appearances determined solely by the variable high velocity output. On the other hand, using radio observations I show that local type Ibc core-collapse supernovae generally lack relativistic ejecta and are therefore not powered by engines. Instead, the highest velocity debris in these sources, typically with a velocity lower than 100,000 km/sec, are produced in the (effectively) spherical ejection of the stellar envelope. The relative rates of engine- and collapse-powered explosions suggest that the former account for only a small fraction of the stellar death rate. Using the first radio and submillimeter observations of GRB hosts, I show that some are extreme starburst galaxies with the bursts directly associated with the regions of most intense star formation. I suggest, by comparison to other well-studied samples, that GRBs preferentially occur in sub-luminous, low mass galaxies, undergoing the early stages of a starburst process. If confirmed with future observations, this trend will place GRBs in the forefront of star formation and galaxy evolution studies.

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Zaradenie knihy Knihy po anglicky Mathematics & science Physics Applied physics

• Celý názov: Cosmic Explosions
• Podnázov: The Beasts and Their Lair
• Autor: EDO Berger
• Jazyk: Angličtina
• Väzba: Brožovaná
• Počet strán: 200
• EAN: 9781581122336
• ISBN: 9781581122336
• ID: 08744043
• Nakladateľ: Dissertation.Com. - Do Not Use
• Hmotnosť: 367 g
• Rozmery: 246 × 189 × 11 mm
• Dátum vydania: 01. July 2004

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