Discovery of a Galaxy Cluster via Weak Lensing

@article{Wittman2001DiscoveryOA,
  title={Discovery of a Galaxy Cluster via Weak Lensing},
  author={David M. Wittman and J. Anthony Tyson and Vera E. Margoniner and J. G. Cohen and Ian P. Dell’Antonio},
  journal={The Astrophysical Journal Letters},
  year={2001},
  volume={557},
  pages={L89 - L92}
}
We report the discovery of a cluster of galaxies via its weak gravitational lensing effect on background galaxies, the first spectroscopically confirmed cluster to be discovered through its gravitational effects rather than by its electromagnetic radiation. This fundamentally different selection mechanism promises to yield mass-selected, rather than baryon- or photon-selected, samples of these important cosmological probes. We have confirmed this cluster with spectroscopic redshifts of 15… 
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