Cosmic Explosions : The Beasts and Their Lair

Language: English

Published by Dissertation.Com Jul 2004, 2004

1581122330 / 9781581122336

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Neuware - 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.…

Seller Inventory # 9781581122336

Title
Cosmic Explosions : The Beasts and Their Lair
Author
Edo Berger
Publisher
Dissertation.Com Jul 2004
Publication year
2004
Condition
Neu
Binding
Taschenbuch
Language
English
ISBN 10
1581122330
ISBN 13
9781581122336
Item weight
398 grams
Dimensions
246x189x11 mm

AHA-BUCH GmbH

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