  We use a very deep 900 ks Chandra X-ray observation of the core of the
Perseus cluster to measure and confirm the hard X-ray emission detected from a
previous analysis. By fitting a model made up of multiple temperature
components plus a powerlaw or hot thermal component, we map the spatial
distribution of the hard flux. We confirm there is a strong hard excess within
the central regions. The total luminosity in the 2-10 keV band inside 3 arcmin
radius is ~5x10^43 erg s^-1. As a second project we place limits on the thermal
gas content of the X-ray cavities in the cluster core. This is done by fitting
a model made up of multiple components to spectra from inside and outside of
the bubbles, and looking at the the difference in strength of a component at a
particular temperature. This approach avoids assumptions about the geometry of
the core of the cluster. Only up to 50 per cent of the volume of the cavities
can be filled with thermal gas with a temperature of 50 keV.
