Journal ArticleDOI
Fluid dynamics of relativistic blast waves
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In this paper, a fluid dynamical treatment of an ultra-relativistic spherical blast wave enclosed by a strong shock is presented, and a simple similarity solution describing the explosion of a fixed amount of energy in a uniform medium is derived, and generalized to include cases in which power is supplied by a central source and the density of the external medium varies with radius.Abstract:
A fluid dynamical treatment of an ultra‐relativistic spherical blast wave enclosed by a strong shock is presented. A simple similarity solution describing the explosion of a fixed amount of energy in a uniform medium is derived, and this is generalized to include cases in which power is supplied by a central source and the density of the external medium varies with radius. Radiative shocks, in which the escaping photons carry away momentum as well as energy, are also discussed. Formulas that interpolate between the non‐ and ultra‐relativistic limits are proposed.read more
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GRB081028 and its late-time afterglow re-brightening
R. Margutti,F. Genet,J. Granot,R. Barniol Duran,C. Guidorzi,G. Chincarini,Junjie Mao,Patricia Schady,T. Sakamoto,Adam A. Miller,Göran Olofsson,J. S. Bloom,Phil Evans,Johan P. U. Fynbo,D. Malesani,A. Moretti,F. Pasotti,D. Starr,D. N. Burrows,S. D. Barthelmy,P. W. A. Roming,N. Gehrels +21 more
TL;DR: In this article, the authors investigate alternative scenarios and find that the observations are consistent with the predictions for a narrow jet viewed off-axis. And they discuss the low on-axis radiative efficiency of GRB081028 comparing its properties with a sample of Swift long gamma-ray burst (GRB) with secure E_gamma,iso measurements.
Journal ArticleDOI
Environment and Energy Injection Effects in GRB Afterglows
Z.G. Dai,Tian Jian Lu +1 more
TL;DR: In this paper, the authors investigated the effects of synchrotron self absorption and energy injection on the evolution of the non-relativistic shock through magnetic dipole radiation and found that after the energy which the shock obtains from the pulsar is much more than the initial energy of the shock, the afterglow decay will flatten significantly.
Journal ArticleDOI
Gamma-Ray Burst Afterglows In The Multi-Messenger Era: Numerical Models and Closure Relations
TL;DR: In this article, the authors present a characterization of the afterglows arising from structured jets, providing a framework covering both successful and choked jets, and compute new closure relations for structured jets and compare with the established relations for energy injection and refreshed shock models.
Journal ArticleDOI
Intrinsic Parameters of GRB990123 from Its Prompt Optical Flash and Afterglow
TL;DR: In this article, the intrinsic parameters of GRB990123, such as the magnetic energy density fraction, the electron density fraction and the initial Lorentz factor, were constrained in terms of the afterglow information and optical flash information.
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High-Energy Aspects of Astrophysical Jets
TL;DR: In this paper, the main leptonic and hadronic processes responsible for the production of high-energy γ-rays, very-high-energy neutrinos and ultra-high energy cosmic rays are discussed.
References
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Journal ArticleDOI
The Formation of a Blast Wave by a Very Intense Explosion. I. Theoretical Discussion
TL;DR: This paper has now been declassified, and though it has been superseded by more complete calculations, it seems appropriate to publish it as it was first written, without alteration, except for the omission of a few lines, the addition of this summary, and a comparison with some more recent experimental work as discussed by the authors.
Journal ArticleDOI
Relativistic Rankine-Hugoniot Equations
TL;DR: In this paper, the relativistic form of the Rankine-Hugoniot equations are derived and it is shown that as a consequence of the inequality mentioned earlier that the shock wave velocity is always less than that of light in vacuum for sufficiently strong shocks.