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We introduce a new imaging analysis technique to study the spatialdistribution of the X-ray emission from the hot bubble of planetary nebulaBD+30 3639. Hot bubble emission is typically photon-starved, thus limiting themethods for spatial-spectral analysis, however, this new technique uses thestatistics of photon energies across the nebula to identify spatial variations.Using the median energy value of the X-ray photons, we identified a rise inmedian energy values towards the projected edge of the nebula, which we referto as radial spectral hardening. We explored the origin of this radial spectralhardening with X-ray spectral analysis of distinct regions of high- andlow-median energy values. Given that the hot bubble is embedded within a young,dense, planetary nebula, we argue that the radial spectral hardening is due toan increased column density at the projected nebular edge. Median energyimaging provides a promising new methodology for exploring the spatialvariations in faint extended X-ray sources.

Discovery of Radial Spectral Hardening in the Hot Bubble of Planetary Nebula BD+30 3639 with Median Energy Imaging