Unraveling the Geometry of the Crab Nebula's "Inner Ring"

Details Unraveling the Geometry of the Crab Nebula's "Inner Ring" Unraveling the Geometry of the Crab Nebula's "Inner Ring"

2011-09-13

arxiv.org/abs/1109.2868v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

12 pages, f figures, submitted to the Astrophysical Journal

Scientific paper

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{\deg} (East of North). This analysis also measures properties of the ellipse: The position angle of the semi-major axis is about 210{\deg} (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{\deg} latitude in pulsar-centered coordinates. Alternative geometries are briefly discussed.

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