We present ROSAT observations of the starburst galaxy NGC 2782 ( HRI plus a weak PSPC frame ) and the ultraluminous infrared galaxy NGC 6240 ( PSPC ) .
The ( 0.1–2.4 ) keV spectra of both objects appear similar .
However , due to better sampling spectral modeling is only warranted in case of NGC 6240 for which both a single thermal Raymond-Smith model ( kT = 0.44 \pm 0.15 ) or a hybrid model consisting of 80 % power-law with the canonical photon index -1.9 plus 20 % Raymond-Smith contribution ( kT = 0.63 \pm 0.35 ) lead to good fits .
However , the single thermal model turns out to be unlikely because it yields a luminosity of 3.8 10 ^ { 43 } erg s ^ { -1 } , which is hard to reach in a starburst superwind–scenario .
The hybrid model leads to a more moderate luminosity of 5.2 10 ^ { 42 } erg s ^ { -1 } , of which 1.0 10 ^ { 42 } erg s ^ { -1 } can be attributed to shocked superwind gas .
We link the remaining 4.2 10 ^ { 42 } erg s ^ { -1 } powerlaw to an AGN component because the alternative of inverse-compton scattering of the FIR radiation leads to a too low flux when estimated with available data .
The result appears to be consistent with preliminarily announced ASCA observations .

For NGC 2782 we find L _ { x } ( 0.1–2.4 keV ) = 4 10 ^ { 41 } erg s ^ { -1 } ( within a factor of four ) which can be explained by emission from a shocked superwind region with a high preshock density in agreement with earlier optical evidence for an outflowing supershell .