Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-06
Astrophys.J. 601 (2004) 479-484
Astronomy and Astrophysics
Astrophysics
10 pages, 2 figures; to appear in the Astrophysical Journal
Scientific paper
10.1086/380486
CXO imaging has shown that equatorial tori, often with polar jets, are very common in young pulsar wind nebulae (PWNe). These structures are interesting both for what they reveal about the relativistic wind itself and for the (nearly) model-independent measurement of the neutron star spin orientation they provide. The later is a particularly valuable probe of pulsar emission models and of neutron star physics.We describe here a procedure for fitting simple 3-D torus models to the X-ray data which provides robust estimates of the geometric parameters. An application to 6 PWN tori gives orientations, PWN shock scales and post-shock wind speeds along with statistical errors. We illustrate the use of these data by commenting on the implications for kick physics and for high energy beaming models.
Ng Cheuk-Yiu
Romani Roger W.
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