First Results On Shear-Selected Clusters From the Deep Lens Survey: Optical Imaging, Spectroscopy, and X-ray Followup

摘要

We present the first sample of galaxy clusters selected on the basis of theirweak gravitational lensing shear. The shear induced by a cluster is a functionof its mass profile and its redshift relative to the background galaxies beingsheared; in contrast to more traditional methods of selecting clusters, shearselection does not depend on the cluster's star formation history, baryoncontent, or dynamical state. Because mass is the property of clusters whichprovides constraints on cosmological parameters, the dependence on these otherparameters could induce potentially important biases in traditionally-selectedsamples. Comparison of a shear-selected sample with optically and X-rayselected samples is therefore of great importance. Here we present the firststep toward a new shear-selected sample: the selection of cluster candidatesfrom the first 8.6 deg$^2$ of the 20 deg$^2$ Deep Lens Survey (DLS), andtabulation of their basic properties such as redshifts and optical and X-raycounterparts.