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We analyze Chandra observations of diffuse soft X-ray emission associatedwith a complete sample of 3CR radio galaxies at z < 0.3. In this paper we focuson the properties of the spectroscopic sub-classes of high excitation galaxies(HEGs) and broad line objects (BLOs). Among the 33 HEGs we detect extended (orpossibly extended) emission in about 40% of the sources; the fraction is evenhigher (8/10) restricting the analysis to the objects with exposure timeslarger than 10 ks. In the 18 BLOs, extended emission is seen only in 2 objects;this lower detection rate can be ascribed to the presence of their bright X-raynuclei that easily outshine any genuine diffuse emission.  A very close correspondence between the soft X-ray and optical linemorphology emerges. We also find that the ratio between [O III] and extendedsoft X-ray luminosity is confined within a factor of 2 around a median value of5. Both results are similar to what is seen in Seyfert galaxies.  We discuss different processes that could explain the soft X-ray emission andconclude that the photoionization of extended gas, coincident with the narrowline region, is the favored mechanism.

Extended soft X-ray emission in 3CR radio galaxies at z < 0.3: High Excitation and Broad Line Galaxies