Dynamical Model of an Expanding Shell

Details Dynamical Model of an Expanding Shell Dynamical Model of an Expanding Shell

2012-03-26

arxiv.org/abs/1203.5797v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Minor revision. Some points clarified, references added. Accepted for publication in Ap.J. (Lett.)

Scientific paper

Expanding blast waves are ubiquitous in many astronomical sources, such as supernovae remnants (SNRs), X-ray emitting binaries (XRBs) and gamma-ray bursts (GRBs). I consider here the dynamics of such an expanding blast wave, both in the adiabatic and the radiative regimes. As the blast wave collects material from the surrounding, it decelerates. A full description of the temporal evolution of the blast wave requires consideration of both the energy density and the pressure of the shocked material. The obtained equation is different than earlier works in which only the energy was considered. The solution converges to the familiar results in both the ultra-relativistic and the sub-relativistic (Newtonian) regimes.

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