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We report the serendipitous detection of the planetary nebula NGC 5315 by theChandra X-ray Observatory. The Chandra imaging spectroscopy results indicatethat the X-rays from this PN, which harbors a Wolf-Rayet (WR) central star,emanate from a T_X ~ 2.5x10^6 K plasma generated via the same wind-windcollisions that have cleared a compact (~8000 AU radius) central cavity withinthe nebula. The inferred X-ray luminosity of NGC 5315 is ~2.5x10^{32} ergs^{-1} (0.3-2.0 keV), placing this object among the most luminous such ``hotbubble'' X-ray sources yet detected within PNe. With the X-ray detection of NGC5315, objects with WR-type central stars now constitute a clear majority ofknown examples of diffuse X-ray sources among PNe; all such ``hot bubble'' PNX-ray sources display well-defined, quasi-continuous optical rims. We thereforeassert that X-ray-luminous hot bubbles are characteristic of young PNe withlarge central star wind kinetic energies and closed bubble morphologies.However, the evidence at hand also suggests that processes such as wind andbubble temporal evolution, as well as heat conduction and/or mixing of hotbubble and nebular gas, ultimately govern the luminosity and temperature ofsuperheated plasma within PNe.

Serendipitous Chandra X-ray Detection of a Hot Bubble within the Planetary Nebula NGC 5315