Abstract
We present the detailed analysis of the X{ray data for 6 pairs, isolated or in poor groups, observed at high resolution with the ROSAT HRI . In all cases, the stronger X{ray source is associated with the brighter early-type member and is extended. The extent varies from galactic to group scale, from 3 (RR 210b) to 182 kpc( RR 22a). The fainter members are detected only in two pairs, RR 210 and RR 259. Except for one case, no signicant substructures have been detected in the X{ray maps, possibly also as a consequence of the poor statistics. The core radii of the X{ray surface brightness proles are in the range 1{3 kpc. The distribution of the luminosities of galaxies in pairs encompasses a very wide range of both luminosities and LX=LB ratios, in spite of the very small number of objects studied so far. Our data provide no evidence that pair membership aects the X{ray properties of galaxies. Observation are discussed in the context of the pair/group evolution.
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