Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-12
Astron.Astrophys. 397 (2003) 913-920
Astronomy and Astrophysics
Astrophysics
7 pages, 9 figures, submitted to A&A
Scientific paper
10.1051/0004-6361:20021488
Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving pulsar. The pulsar moves through the interstellar medium or, in the more interesting case, through the supernova remnant created at its birth event. In both cases there exists a three-fold structure consisting of the wind termination shock, contact discontinuity and a bow shock bounding the pulsar wind nebula. Using hydrodynamical simulations we study the behaviour of the pulsar wind nebula inside a supernova remnant, and in particular the interaction with the outer shell of swept up interstellar matter and the blast wave surrounding the remnant. This interaction occurs when the pulsar breaks out of the supernova remnant. We assume the remnant is in the Sedov stage of its evolution. Just before break-through, the Mach number associated with the pulsar motion equals ${\cal M}_{\rm psr} = 7/\sqrt{5}$, {\em independent} of the supernova explosion energy and pulsar velocity. The bow shock structure is shown to survive this break-through event.
Achterberg Abraham
der Swaluw Eric van
Downes Thomas Patrick
Gallant Yves A.
Keppens Rony
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