|
|||||
|
|
Wisp motions in the Crab nebula |
|
| Authors: | NR Tanvir RC Thomson EG Tsikarishvili |
| Institution: | aInstitute of Astronomy, Madingley Road, Cambridge, UK bDepartment of Physical Sciences, University of Hertfordshire, Hatfield, UK cAbastumani Astrophysical Observatory, Tbilisi, Georgia |
| Abstract: | 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. |
| Keywords: | PACS: 98 38 Mz 97 60 Gb 95 30 Qd |
| 本文献已被 ScienceDirect 等数据库收录！ | |