Abstract
The Eskimo Nebula (NGC 2392) is a double-shell planetary nebula (PN) known for the exceptionally large expansion velocity of its inner shell, ∼90 km s -1 , and the existence of a fast bipolar outflow with a line-of-sight expansion velocity approaching 200 km s -1 . We have obtained XMM-Newton observations of the Eskimo and detected diffuse X-ray emission within its inner shell. The X-ray spectra suggest thin plasma emission with a temperature of ∼2 x 10 6 K and an X-ray luminosity of L X = (2.6 ± 1.0) x 10 31 (d/1150 pc) 2 erg s -1 , where d is the distance in parsecs. The diffuse X-ray emission shows noticeably different spatial distributions between the 0.2-0.65 keV and 0.65-2.0 keV bands. High-resolution X-ray images of the Eskimo are needed to determine whether its diffuse X-ray emission originates from shocked fast wind or bipolar outflows.
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