CaltechAUTHORS
Published August 20, 2001 | Version Published + Submitted
Journal Article Open

Discovery of a Galaxy Cluster via Weak Lensing

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Brown University

Abstract

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 members at z = 0.276, with a velocity dispersion of 615 km s^(-1). 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.

Additional Information

© 2001. The American Astronomical Society. Received 2001 April 5; accepted 2001 July 10; published 2001 July 23. We thank P. Guhathakurta for providing spectroscopic redshifts outside the cluster and the CTIO staff for their help with the BTC project and for their upgrading and maintenance of the delivered image quality of the Blanco telescope. The CTIO is a division of National Optical Astronomy Observatory (NOAO), which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation (NSF). BTC construction was partially funded by the NSF.

Attached Files

Published - pdf

Submitted - 0104094.pdf

Files

0104094.pdf

Files (272.8 kB)

Name Size
md5:be32c821532a3e93a0be2801010626bb
158.5 kB Preview Download
pdf
md5:9ed07723706498fb4ad64213a693553b
114.3 kB Preview Download

Additional details

Identifiers

Eprint ID
76147
DOI
10.1086/323173
Resolver ID
CaltechAUTHORS:20170408-161252591

Related works

Describes
http://arxiv.org/abs/astro-ph/0104094 (URL)

Funding

Association of Universities for Research in Astronomy (AURA)
NSF

Dates

Created
2017-07-10
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field