Chandra reveals the X-ray glint in the cat's eye

We have obtained Chandra ACIS-S observations of NGC 6543, the Cat's Eye Neb ula. The X-ray emission from NGC 6543 is clearly resolved into a point sour ce at the central star and diffuse emission confined within the central ell iptical shell and two extensions along the major axis. Spectral analysis of the diffuse component shows that the abundances of the X-ray-emitting gas are similar to those of the fast (1750 km s(-1)) stellar wind but not those of the nebula. Furthermore, the temperature of this gas is similar to1.7 x 10(6) K, which is 100 times lower than the expected postshock temperature of the fast stellar wind. The combination of low temperature and wind abund ances is puzzling. The thermal pressure of this hot gas is about twice the pressure in the cool nebular shell; thus, the hot gas plays an essential ro le in the ongoing evolution of the nebula.