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   51009
   Galactic Ridge Emission (GRE) is the emission from optically thin
   thermal plasma spread over the inner galactic disk with a scale height
   of 100pc. It is still a matter of debate whether it originates from
   truely diffusive gas filling the entire disk or from superposition of
   individual X-ray sources. We propose to observe nearby single white
   dwarfs in order to detect hard X-rays caused by accretion of the
   interstellar matter. According to a simple estimation, the integration
   of this emission over the entire inner galactic disk can explain the
   amount and spectral properties of GRE.
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