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The present paper is devoted to the construction of a catalog of isolatedgalaxy pairs from the Uppsala Galaxy Catalog (UGC), using accurate radialvelocities. The UGC lists 12921 galaxies to declination larger than -2 deg 30min and is complete to an apparent diameter of 1 arcmin. The criteria used todefine the isolated galaxy pairs are the following: 1) Velocity criterion:radial velocity difference between the members lower than 500 km/s; 2)Interdistance criterion: projected distance between the members smaller than 1Mpc; 3) Reciprocity criterion: each member is the closest galaxy to the otherone, which excludes multiplets; 4) Isolation information: the catalog lists theratio between the projected distance to the closest UGC galaxy (having avelocity difference smaller than 500 km/s) and the pair members interdistance,thus allowing one to choose any isolation criterion (beyond the chosen limit2.5). In addition, we have accounted for the small diameter bias by searchingfor CGCG galaxies in the pair environment and used the same isolationcriterion. A peculiar investigation has allowed to gather very accurate radialvelocities for pair members, from high quality HI and optical measurements(median uncertainty on velocity differences 10 km/s). Our final catalogcontains 1005 galaxy pairs. Then we give some global properties of the paircatalog. We display the histograms of the radial velocity differences betweenthe pair members and of their projected interdistances (median 0.29 Mpc).Finally, we provide an estimate of the contamination by cosmological false"pairs", which is about 10 percent up to a velocity difference of 380 km/s,beyond which all pairs are probably false.

A catalog of UGC isolated galaxy pairs with accurate radial velocities