Discovery of a Galaxy Cluster via Weak Lensing | Zendy

David Wittman | Zendy; J. A. Tyson | Zendy; V. E. Margoniner | Zendy; Judith G. Cohen | Zendy; Ian Dell’Antonio | Zendy

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Discovery of a Galaxy Cluster via Weak Lensing

Author(s) -

David Wittman,

J. A. Tyson,

V. E. Margoniner,

Judith G. Cohen,

Ian Dell’Antonio

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323173

Subject(s) - physics , astrophysics , redshift , weak gravitational lensing , gravitational lens , velocity dispersion , galaxy , galaxy cluster , cluster (spacecraft) , astronomy , computer science , programming language

We report the discovery of a cluster of galaxies via its weak gravitationallensing effect on background galaxies, the first spectroscopically confirmedcluster to be discovered through its gravitational effects rather than by itselectromagnetic radiation. This fundamentally different selection mechanismpromises to yield mass-selected, rather than baryon or photon-selected, samplesof these important cosmological probes. We have confirmed this cluster withspectroscopic redshifts of fifteen members at z=0.276, with a velocitydispersion of 615 km/s. We use the tangential shear as a function of sourcephotometric redshift to estimate the lens redshift independently and find z_l =0.30 +- 0.08. The good agreement with the spectroscopy indicates that theredshift evolution of the mass function may be measurable from the imaging dataalone in shear-selected surveys.Comment: revised version with minor changes, to appear in ApJ

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