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: firstname.lastname@example.org
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
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