Discovery of a Galaxy Cluster via Weak Lensing

Details Discovery of a Galaxy Cluster via Weak Lensing Discovery of a Galaxy Cluster via Weak Lensing

2001-04-04

arxiv.org/abs/astro-ph/0104094v3

ApJL 557, L89 (2001)

Astronomy and Astrophysics

Astrophysics

revised version with minor changes, to appear in ApJL

Scientific paper

10.1086/323173

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 fifteen members at z=0.276, with a velocity dispersion of 615 km/s. We use the tangential shear as a function of source photometric redshift to estimate the lens redshift independently and find z_l = 0.30 +- 0.08. The good agreement with the spectroscopy indicates that the redshift evolution of the mass function may be measurable from the imaging data alone in shear-selected surveys.

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