  A new Chandra observation of SNR 0506-68.0 (also called N23) reveals a
complex, highly structured morphology in the low energy X-ray band and an
isolated compact central object in the high energy band. Spectral analysis
indicates that the X-ray emission overall is dominated by thermal gas whose
composition is consistent with swept-up ambient material. There is a strong
gradient in ambient density across the diameter of the remnant. Toward the
southeast, near a prominent star cluster, the emitting density is 10 - 23
cm^{-3} while toward the northwest it has dropped to a value of only 1 cm^{-3}.
The total extent of the X-ray remnant is 100" by 120" (24 pc x 29 pc for a
distance of 50 kpc), somewhat larger than previously known. The remnant's age
is estimated to be ~4600 yr. One part of the remnant shows evidence for
enhanced O, Ne, and perhaps Mg abundances, which is interpreted as evidence for
ejecta from a massive star core collapse supernova. The compact central object
has a luminosity of a few times 10^{33} ergs/s and no obvious radio or optical
counterpart. It does not show an extended nebula or pulsed emission as expected
from a young energetic pulsar, but resembles the compact central objects seen
in other core collapse SNe, such as Cas A.
