  Observations of the Seyfert 2 and starburst galaxy NGC 5135 with the Chandra
X-ray Observatory demonstrate that both of these phenomena contribute
significantly to its X-ray emission. We spatially isolate the active galactic
nucleus (AGN) and demonstrate that it is entirely obscured by column density
N_H > 10^{24} cm^{-2}, detectable in the Chandra bandpass only as a strongly
reprocessed, weak continuum and a prominent iron K alpha emission line with
equivalent width of 2.4 keV. Most of the soft X-ray emission, both near the AGN
and extending over several-kpc spatial scales, is collisionally-excited plasma.
We attribute this thermal emission to stellar processes. The AGN dominates the
X-ray emission only at energies above 4 keV. In the spectral energy
distribution that extends to far-infrared wavelengths, nearly all of the
emergent luminosity below 10 keV is attributable to star formation, not the
AGN.
