Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.329l..34l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 329, Issue 2, pp. L34-L36.
Astronomy and Astrophysics
Astronomy
37
Mhd, Shock Waves, Pulsars: General, Ism: Individual: Crab Nebula, Ism: Jets And Outflows, Supernova Remnants
Scientific paper
Origin of the jet-like feature in the inner Crab Nebula is discussed. Because self-collimation processes in ultrarelativistic pulsar winds are extremely ineffective, it is suggested that the collimation occurs beyond the termination shock where the flow is already mildly (or non-) relativistic. It is argued that the shock shape is highly non-spherical because the energy flux in the pulsar wind decreases towards the axis. The shock near the axis should be much closer to the pulsar than at the equator and therefore the jet looks as if it originates directly from the pulsar.
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