Wisp motions in the Crab nebula

Details Wisp motions in the Crab nebula Wisp motions in the Crab nebula

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997newa....1..311t&link_type=abstract

New Astronomy, vol. 1, no. 4, p. 311-319.

Astronomy and Astrophysics

Astronomy

13

Pulsars: Individual: Crab Pulsar, Supernova Remnants, Ism: Jets And Outflows

Scientific paper

We present the results of a CCD monitoring campaign of the continuum emission from the central region of the Crab nebula, amounting to 17 epochs spread over 3.5 years. The data provide clear evidence that the brightest wisps move outward from the pulsar at mildly relativistic velocities. This motion, combined with the shape of the wisps, supports the idea that they arise at a standing shock in an equatorial wind. The deprojected velocity of the wisps in the equatorial plane is <~c/3. We see only small changes in the so-called `thin wisps' which leads us to suggest that these wisps may be the result of a back-flow from the shock in a toroidal cavity around the pulsar.

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