Journal ArticleDOI
Collapsar Jets, Bubbles, and Fe Lines
Peter Mészáros,Martin J. Rees +1 more
TLDR
In this paper, the structure and time dependence of relativistic jets depend on the stellar envelope and central engine properties, assuming a steady jet injection, and it takes a few seconds for the jet to bore its way through the stellar core; most of the energy output during that period goes into a cocoon of magnetized plasma surrounding the jet.Abstract:
In the collapsar scenario, gamma-ray bursts are caused by relativistic jets expelled along the rotation axis of a collapsing stellar core. We discuss how the structure and time dependence of such jets depend on the stellar envelope and central engine properties, assuming a steady jet injection. It takes a few seconds for the jet to bore its way through the stellar core; most of the energy output during that period goes into a cocoon of relativistic plasma surrounding the jet. This material subsequently forms a bubble of magnetized plasma that takes several hours to expand, subrelativistically, through the envelope of a high-mass supergiant. Jet breakthrough and a conventional burst would be expected not only in He stars but possibly also in blue supergiants. Shock waves and magnetic dissipation in the escaping bubble can contribute a nonthermal UV/X-ray afterglow, and also excite Fe line emission from thermal gas, in addition to the standard jet deceleration power-law afterglow.read more
Citations
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Journal ArticleDOI
The physics of gamma-ray bursts
TL;DR: A review of the current theoretical understanding of the physical processes believed to take place in GRB's can be found in this article, where the authors focus on the afterglow itself, the jet break in the light curve, and the optical flash that accompanies the GRB.
Journal ArticleDOI
The Supernova Gamma-Ray Burst Connection
S. E. Woosley,Joshua S. Bloom +1 more
TL;DR: In this article, it was shown that most long-duration soft-spectrum gamma-ray bursts are accompanied by massive stellar explosions (GRB-SNe) and that most of the energy in the explosion is contained in nonrelativistic ejecta (producing the supernova) rather than in the relativistic jets responsible for making the burst and its afterglow.
Journal ArticleDOI
Gamma-ray bursts
TL;DR: In this article, the interplay between these observations and theoretical models of the prompt gamma-ray burst and its afterglow is reviewed, and a model of the burst's origin and mechanism is proposed.
Journal ArticleDOI
Physical Processes Shaping Gamma-Ray Burst X-Ray Afterglow Light Curves: Theoretical Implications from the Swift X-Ray Telescope Observations
Bing Zhang,Yi-Zhong Fan,Yi-Zhong Fan,J. Dyks,Shiho Kobayashi,Shiho Kobayashi,Peter Mészáros,David N. Burrows,John A. Nousek,Neil Gehrels +9 more
TL;DR: In this article, the authors systematically analyze the possible physical processes that shape the properties of the early X-ray afterglow light curves and use the data to constrain various models.
Journal ArticleDOI
The physics of gamma-ray bursts & relativistic jets
Pawan Kumar,Bing Zhang +1 more
TL;DR: A comprehensive review of major developments in our understanding of gamma-ray bursts, with particular focus on the discoveries made within the last fifteen years when their true nature was uncovered, can be found in this paper.
References
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Journal ArticleDOI
Theory of extragalactic radio sources
TL;DR: In this article, a unified model of nuclear activity and a unified approach to infer the pressures, densities, and fluid velocities within jets are explained. But the model is not applicable to the case of relativistic radio sources.
Journal ArticleDOI
Are Gamma-Ray Bursts in Star-Forming Regions?
TL;DR: The gamma-ray burst of GRB 970508 (z = 0.835) was a few hundred times more luminous than any supernova as discussed by the authors, and the name "hypernova" was proposed for the whole GRB/afterglow event.
Journal ArticleDOI
Supernovae, Jets, and Collapsars
TL;DR: In this paper, the authors studied the possible production of supernovae and a variety of high-energy transients by black hole formation in massive stars endowed with rotation: the "collapsar model."
Journal ArticleDOI
A hypernova model for the supernova associated with the gamma ray burst of 25 April 1998
Koichi Iwamoto,Paolo A. Mazzali,Ken'ichi Nomoto,Hideyuki Umeda,Takahisa Nakamura,Ferdinando Patat,I. J. Danziger,T. R. Young,Tsutomu Suzuki,Toshikazu Shigeyama,T. Augusteijn,V. Doublier,J.-F. Gonzalez,H. Boehnhardt,J. Brewer,Olivier Hainaut,Christopher Lidman,Bruno Leibundgut,Enrico Cappellaro,Massimo Turatto,Titus Galama,P. M. Vreeswijk,Chryssa Kouveliotou,J. van Paradijs,J. van Paradijs,Elena Pian,E. Palazzi,Filippo Frontera +27 more
TL;DR: The discovery of the unusual supernova SN1998bw, and its possible association with the γ-ray burst GRB 9804251,2,3, provide new insights into the explosion mechanism of very massive stars and the origin of some classes of gamma-ray bursts.
Journal ArticleDOI
A `Hypernova' model for SN 1998bw associated with gamma-ray burst of 25 April 1998
Koichi Iwamoto,Paolo A. Mazzali,K. Nomoto,H. Umeda,T. Nakamura,Ferdinando Patat,I. J. Danziger,T. R. Young,T. Suzuki,Toshikazu Shigeyama,T. Augusteijn,V. Doublier,H. Boehnhardt,J. Brewer,Olivier Hainaut,C. Lidman,Bruno Leibundgut,Enrico Cappellaro,Massimo Turatto,Titus Galama,P. M. Vreeswijk,Chryssa Kouveliotou,J. van Paradijs,Elena Pian,E. Palazzi,F. Frontera +25 more
TL;DR: The discovery of the peculiar supernova (SN) 1998bw and its possible association with the gamma-ray burst (GRB) 980425$ 1,2,3} provides new clues to the understanding of the explosion mechanism of very massive stars and to the origin of some classes of gamma ray bursts.
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