We analyze recent simultaneous Chandra/RXTE observations of the Seyfert 2 galaxy NGC 4945 .
The unprecedented spatial resolution of Chandra means we are able to separate the spectra of the nucleus , starburst and superwind regions , while the RXTE data extend the spectrum to higher energies .
The extreme absorbing column of N _ { H } \sim 4 \times 10 ^ { 24 } cm ^ { -2 } means that the nucleus is only seen directly above 8–10 keV , while the lower energy spectrum from the nuclear region in Chandra is dominated by reflection .
By contrast , the superwind is dominated by emission from hot plasma , but the starburst region contains both hot plasma and reflection signatures .
To form a reflected spectrum requires that the starburst region contains clumps of cool , optically thick material , perhaps star forming cores , which are irradiated by 7–10 keV photons from the nucleus .
Since photons of this energy are obscured along the line sight then this confirms the result of Madejski et al .
( 2000 ) that the extreme absorbtion material is disk-like rather than a torus .
However , the IR/optical limits on the lack of high excitation emission lines show that by contrast the lower energy photons from the nucleus are obscured in all directions .
We discuss the complex absorption structure revealed by these observations , and propose an an overall source geometry in which the nucleus is completely embedded in material with N _ { H } \sim 10 ^ { 23 } cm ^ { -2 }