  The point source RX J0007.0+7302, at the center of supernova remnant CTA 1,
was studied using the X-Ray Multi-mirror Mission. The X-ray spectrum of the
source is consistent with a neutron star interpretation, and is well described
by a power law with the addition of a soft thermal component that may
correspond to emission from hot polar cap regions or to cooling emission from a
light element atmosphere over the entire star. There is evidence of extended
emission on small spatial scales which may correspond to structure in the
underlying synchrotron nebula. No pulsations are observed. Extrapolation of the
nonthermal spectrum of RX J0007.0+7302 to gamma-ray energies yields a flux
consistent with that of EGRET source 3EG J0010+7309, supporting the proposition
that there is a gamma-ray emitting pulsar at the center of CTA 1. Observations
of the outer regions of CTA 1 with the Advanced Satellite for Cosmology and
Astrophysics confirm earlier detections of thermal emission from the remnant
and show that the synchrotron nebula extends to the outermost reaches of the
SNR.
