Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula

Details Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula

2000-03-15

arxiv.org/abs/astro-ph/0003216v2

Astronomy and Astrophysics

Astrophysics

7 pages including 4 figures as accepted by Ap J Letters

Scientific paper

10.1086/312733

The Chandra X-ray Observatory observed the Crab Nebula and Pulsar during orbital calibration. Zeroth-order images with the High-Energy Transmission Grating (HETG) read-out by the Advanced CCD Imaging Spectrometer spectroscopy array (ACIS-S) show a striking richness of x-ray structure, at a resolution comparable to that of the best ground-based visible-light observations. The HETG--ACIS-S images reveal, for the first time, an x-ray inner ring within the x-ray torus, the suggestion of a hollow-tube structure for the torus, and x-ray knots along the inner ring and (perhaps) along the inward extension of the x-ray jet. Although complicated by instrumental effects and the brightness of the Crab Nebula, the spectrometric analysis shows systematic variations of the x-ray spectrum throughout the Nebula.

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