X-ray spectral variation of the Crab Nebula in arc-second scale

Details X-ray spectral variation of the Crab Nebula in arc-second scale X-ray spectral variation of the Crab Nebula in arc-second scale

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114408m&link_type=abstract

American Astronomical Society Meeting 201, #144.08; Bulletin of the American Astronomical Society, Vol. 35, p.570

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Scientific paper

We present spectral analysis results of the Crab Nebula with the Chandra X-ray observatory. The Crab Nebula in X-ray wavelength shows an axisymmetric structure about the polar jet running in northeast-southwest direction. In the equatorial plane containing the Crab Pulsar, the torus and the inner ring can be seen. Chandra's imaging capability enables us to study a spatially-resolved spectroscopy of the Crab Nebula in arc-second scale.
The spectral property characterized by power-law model varies across the nebula. From the spectroscopic point of view, the nebula can be divided into four regions: regions within the torus, the peripheral region of the torus, the jet, and the northwestern region of the torus. Spectra of region within the torus are the hardest of photon index α of ˜ 1.9 and almost constant regardless of the surface brightness. On the contrary, at periphery of the torus, the spectrum gradually softens in outer and lower surface brightness regions up to α of ˜ 2.5. Although the surface brightness of the jet is almost the same as those of the peripheral regions, the spectrum of the jet is harder with α of ˜ 2.0. On the other hand, comparing the region within the torus, northwestern regions of the torus exhibit softer spectra although both regions have wide range of surface brightness of 0.2 -- 0.7 count sec-1 arcsec-2. A column density variation across the nebula is also indicated.
Considering the spectral slope variation in the equatorial plane, it is suggested that the torus is a synchrotron burn-off boundary where the synchrotron loss becomes significant to X-ray emitting particle.

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