Snapshots of strong lensing low mass clusters at intermediate redshift

Chandra and XMM are extending the minimum luminosity to which Xray clusters canbe detected and analyzed at intermediate redshifts, probing massescharacteristic of poor clusters. Strong lensing systems with image separationsin the range 616 are starting to be detected thus opening also with thistechnique a new window of exploration in this crucial mass range. Anunprecedented opportunity of Xraylensing comparison is therefore opening in anunexplored lower mass regime compared to the one of massive clusters. Therefore,we propose to continue a snapshot survey of promising strong lensing poorclusters to secure their Xray fluxes. Deep followup exposures with Chandrawill then be proposed for detailed analysis of the mass profile. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]