RCSLenS: Cosmic Distances from Weak Lensing

Autor:	Kitching, T. D., Viola, M., Hildebrandt, H., Choi, A., Erben, T., Gilbank, D. G., Heymans, C., Miller, L., Nakajima, R., van Uitert, E.
Rok vydání:	2015
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
Popis:	In this paper we present results of applying the shear-ratio method to the RCSLenS data. The method takes the ratio of the mean of the weak lensing tangential shear signal about galaxy clusters, averaged over all clusters of the same redshift, in multiple background redshift bins. In taking a ratio the mass-dependency of the shear signal is cancelled-out leaving a statistic that is dependent on the geometric part of the lensing kernel only. We apply this method to 535 clusters and measure a cosmology-independent distance-redshift relation to redshifts z~1. In combination with Planck data the method lifts the degeneracies in the CMB measurements, resulting in cosmological parameter constraints of OmegaM=0.31 +/- 0.10 and w0 = -1.02 +/- 0.37, for a flat wCDM cosmology. Comment: 9 pages, 5 figures. Submitted to MNRAS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1512.03627 Zobrazit plný text záznamu View this record from Arxiv