Temporal Variability of the X‐Ray Emission of the Crab Nebula Torus | Zendy

C. Greiveldinger | Zendy; B. Aschenbach | Zendy

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Temporal Variability of the X‐Ray Emission of the Crab Nebula Torus

Author(s) -

C. Greiveldinger,

B. Aschenbach

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306562

Subject(s) - torus , crab nebula , brightness , astrophysics , physics , surface brightness , nebula , rosat , synchrotron , pulsar , astronomy , x ray , optics , galaxy , geometry , stars , mathematics

We have analyzed five ROSAT HRI images of the Crab Nebula spanning the years1991 to 1997 and have found significant changes in the emission structure ofthe X-ray torus surrounding the pulsar. Certain regions increase in brightnessby about 20% over the six years, while others show decreases in surfacebrightness. The origin of these changes is unclear, but a possible explanationis that the bulk velocity of the synchrotron radiating electrons has decreasedon the order of 20% as well.Comment: 15 pages plus 6 figures, figure 1 and figure 6 are in color, to appear in The Astrophysical Journal, Jan 1, 1999, Vol. 510, #

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