A southwest region of the Carina nebula was observed with the Suzaku observatory for 47 ks in 2010 December .
This region shows distinctively soft X-ray emission in the Chandra campaign observations . Suzaku clearly detects the diffuse emission above known foreground and background components between 0.4 - 5 keV at the surface brightness of 3.3 \times 10 ^ { -14 } erg s ^ { -1 } arcmin ^ { -2 } .
The spectrum requires two plasma emission components with kT \sim 0.2 and 0.5 keV , which suffer interstellar absorption of N _ { H } \sim 1.9 \times 10 ^ { 21 } cm ^ { -2 } .
Multiple absorption models assuming two temperature plasmas at ionization equilibrium or non-equilibrium are tested but there is no significant difference in terms of \chi ^ { 2 } /d.o.f..
These plasma temperatures are similar to those of the central and eastern parts of the Carina nebula measured in earlier Suzaku observations , but the surface brightness of the hot component is significantly lower than those of the other regions .
This means that these two plasma components are physically separated and have different origins .
The elemental abundances of O , Ne and Mg with respect to Fe favor that the diffuse plasma originates from core-collapsed supernovae or massive stellar winds .