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The X-Ray Telescope (XRT) on the Japanese/USA/UK {\it Hinode (Solar-B)}spacecraft has detected emission from a quiescent active region core that isconsistent with nanoflare heating. The fluxes from 10 broadband X-ray filtersand filter combinations were used to constructed Differential Emission Measure(DEM) curves. In addition to the expected active region peak at Log T =6.3-6.5, we find a high-temperature component with significant emission measureat Log T $>$ 7.0. This emission measure is weak compared to the main peak --the DEM is down by almost three orders of magnitude -- which accounts of thefact that it has not been observed with earlier instruments. It is alsoconsistent with spectra of quiescent active regions: no Fe XIX lines areobserved in a CHIANTI synthetic spectrum generated using the XRT DEMdistribution. The DEM result is successfully reproduced with a simpletwo-component nanoflare model.

Hinode X-Ray Telescope Detection of Hot Emission from Quiescent Active Regions: A Nanoflare Signature?