Weak Lensing Discovery and Tomography of a Cluster at z=0.68

Details Weak Lensing Discovery and Tomography of a Cluster at z=0.68 Weak Lensing Discovery and Tomography of a Cluster at z=0.68

2002-10-04

arxiv.org/abs/astro-ph/0210120v2

Astrophys.J. 597 (2003) 218-224

Astronomy and Astrophysics

Astrophysics

Final version. Substantially expanded from first version, including more detail, more figures, and more mass estimates, includ

Scientific paper

10.1086/378344

We report the weak lensing discovery, spectroscopic confirmation, and weak lensing tomography of a massive cluster of galaxies at $z=0.68$, demonstrating that shear selection of clusters works at redshifts high enough to be cosmologically interesting. The mass estimate from weak lensing, $11.1 +- 2.8 x 10^{14} (r/Mpc)$ solar masses within projected radius r, agrees with that derived from the spectroscopy ($\sigma_v = 980 km s^{-1}$), and with the position of an arc which is likely to be a strongly lensed background galaxy. The redshift estimate from weak lensing tomography is consistent with the spectroscopy, demonstrating the feasibility of baryon-unbiased mass surveys. This tomographic technique will be able to roughly identify the redshifts of any dark clusters which may appear in shear-selected samples, up to z ~ 1.

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