Temporal Variability of the X-ray Emission of the Crab Nebula Torus

Details Temporal Variability of the X-ray Emission of the Crab Nebula Torus Temporal Variability of the X-ray Emission of the Crab Nebula Torus

1998-08-19

arxiv.org/abs/astro-ph/9808208v1

Astronomy and Astrophysics

Astrophysics

15 pages plus 6 figures, figure 1 and figure 6 are in color, to appear in The Astrophysical Journal, Jan 1, 1999, Vol. 510, #1

Scientific paper

10.1086/306562

We have analyzed five ROSAT HRI images of the Crab Nebula spanning the years 1991 to 1997 and have found significant changes in the emission structure of the X-ray torus surrounding the pulsar. Certain regions increase in brightness by about 20% over the six years, while others show decreases in surface brightness. The origin of these changes is unclear, but a possible explanation is that the bulk velocity of the synchrotron radiating electrons has decreased on the order of 20% as well.

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