Volume 468, Number 3, June IV 2007Extended baselines for the IRAM Plateau de Bure interferometer: First results
|Page(s)||859 - 876|
|Section||Cosmology (including clusters of galaxies)|
|Published online||11 April 2007|
VII. Cosmic shear analysis
Argelander-Institut für Astronomie (Founded by merging of the Sternwarte, Radioastronomisches Institut and Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn.) , Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany e-mail: email@example.com
2 Isaac Newton Group of Telescopes, Apartado de correos 321, 38700 Santa Cruz de La Palma, Tenerife, Spain
Accepted: 6 April 2007
Aims.We present a cosmic shear analysis and data validation of 15 square degree high-quality R-band data of the Garching-Bonn Deep Survey obtained with the Wide Field Imager of the MPG/ESO 2.2 m telescope.
Methods.We measure the two-point shear correlation functions to calculate the aperture mass dispersion. Both statistics are used to perform the data quality control. Combining the cosmic shear signal with a photometric redshift distribution of a galaxy sub-sample obtained from two square degree of UBVRI-band observations of the Deep Public Survey we determine constraints for the matter density , the mass power spectrum normalisation and the dark energy density in the magnitude interval . In this magnitude interval the effective number density of source galaxies is , and their mean redshift is . To estimate the posterior likelihood we employ the Monte Carlo Markov Chain method.
Results.Using the aperture mass dispersion we obtain for the mass power spectrum normalisation ( statistical error) at a fixed matter density assuming a flat universe with negligible baryon content and marginalising over the Hubble parameter and the uncertainties in the fitted redshift distribution.
Key words: gravitational lensing / large-scale structure of the Universe / cosmological parameters
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.