Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-03
Astron.Astrophys. 462 (2007) 875
Astronomy and Astrophysics
Astrophysics
25 pages, 18 figures, submitted to A&A; for a better print version, see http://www.astro.uni-bonn.de/~mischa/astroph_0607022.p
Scientific paper
10.1051/0004-6361:20065955
The aim of the present work is the construction of a mass-selected galaxy cluster sample based on weak gravitational lensing methods. This sample will be subject to spectroscopic follow-up observations. We apply the mass aperture statistics and a derivative of it to 19 square degrees of high quality, single colour wide field imaging data obtained with the WFI@MPG/ESO 2.2m telescope. For the statistics a family of filter functions is used that approximates the expected tangential radial shear profile and thus allows for the efficient detection of mass concentrations. We identify 158 possible mass concentrations. This is the first time that such a large and blindly selected sample is published. 72 of the detections are associated with concentrations of bright galaxies. For about 22 of those we found spectra in the literature, indicating or proving that the galaxies seen are indeed spatially concentrated. 15 of those were previously known to be clusters or have meanwhile been secured as such. We currently follow-up a larger number of them spectroscopically to obtain deeper insight into their physical properties. The remaining 55% of the possible mass concentrations found are not associated with any optical light, or could not be classified unambiguously. We show that those "dark" detections are to a significant degree due to noise, and appear preferentially in shallow data.
Erben Thomas
Hetterscheidt Marco
Schirmer Mischa
Schneider Peter
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