Unraveling the Geometry of the Crab Nebula's "Inner Ring"
arXiv:1109.2868 · doi:10.1088/0004-637X/746/1/41
Abstract
Chandra images of the Crab Nebula resolve the detailed structure of its "inner ring", possibly a termination shock where pulsar-accelerated relativistic particles begin to emit X radiation. Analysis of these images finds that the center of the ellipse-presumably a circular ring in projection-lies about 0.9" (10 light-days at 2 kpc) from the pulsar's image, at a position angle of about 300° (East of North). This analysis also measures properties of the ellipse: The position angle of the semi-major axis is about 210° (East of North); the aspect ratio, 0.49. In a simple-albeit, not unique-de-projection of the observed geometry, a circular ring is centered on the axis of symmetry of the pulsar wind nebula. This ring is not equatorial but rather lies near +4.5° latitude in pulsar-centered coordinates. Alternative geometries are briefly discussed.
12 pages, f figures, submitted to the Astrophysical Journal
References in corpus (1)
Cited by in corpus (17)
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