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We present results from a systematic investigation of the X-ray properties ofa sample of moderate redshift (0.3<z<0.6) galaxy groups. These groups wereselected not by traditional X-ray or optical search methods, but rather by anassociation, either physical or along the line of sight, with a stronggravitational lens. We calculate the properties of seven galaxy groups in thefields of six lens systems. Diffuse X-ray emission from the intragroup mediumis detected in four of the groups. All of the detected groups have X-rayluminosities greater than 10^{42} h^{-2} erg/s, and lie on the L_X-sigma_vrelations defined by local groups and clusters. The upper limits for thenon-detections are also consistent with the local L_X-sigma_v relationships.Although the sample size is small and deeper optical and X-ray data are needed,these results suggest that lens-selected groups are similar to X-ray selectedsamples and, thus, are more massive than the typical poor-group environments oflocal galaxies.

The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses