Discovery of a Galaxy Cluster via Weak Lensing

Дата и время публикации : 2001-04-04T21:57:31Z

Авторы публикации и институты :
D. Wittman (Bell Laboratories, Lucent Technologies)
J. A. Tyson (Bell Laboratories, Lucent Technologies)
V. E. Margoniner (Bell Laboratories, Lucent Technologies)
J. G. Cohen (Caltech)
I. P. Dell’Antonio (Brown University)

Оригинал статьи :

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Ссылка на журнал-издание: ApJL 557, L89 (2001)
Коментарии к статье: revised version with minor changes, to appear in ApJL
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: 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.

Category: Physics