Weak lensing analysis of MS 1008–1224 with the VLT
نویسندگان
چکیده
منابع مشابه
Weak lensing mass reconstruction of MS1008.1-1224 with the VLT
We present an in-depth weak lensing analysis of the cluster MS1008.1−1224 based on deep multicolor imaging obtained during the Science Verification of FORS1 at the VLT. The image quality (half arcsec seeing) and depth of the VLT images allow the shear signal to be mapped with high signalto-noise and to be traced out to 1.2h−1 50 Mpc, near the edge of the 6. ′8 × 6. ′8 field of view. Using BVRI ...
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Galaxy cluster mass distributions are useful probes of Ω0 and the nature of the dark matter. Large clusters will distort the observed shapes of background galaxies through gravitational lensing allowing the measurement of the cluster mass distributions. For most cases, the agreement between weak lensing and radial velocity mass measurements of clusters is reasonably good. There is, however, one...
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Aims. We study degeneracies between cosmological parameters and measurement errors from cosmic shear surveys. We simulate realistic survey topologies with non-uniform sky coverage, and quantify the effect of survey geometry, depth and noise from intrinsic galaxy ellipticities on the parameter errors. This analysis allows us to optimise the survey geometry. Methods. We carry out a principal comp...
متن کاملWeak Lensing Analysis of Galaxy Groups
Weak gravitational lensing is an important technique to study galaxy associations such as clusters and groups. Based on the coherent distortion imprint on the shape of background galaxies, this technique is capable of measuring the total mass content of the systems under investigation without making any assumption on their dynamical or evolutionary state. Mass estimates of galaxy groups are ver...
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Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening mass. Since the lensing effects arise from deflections of the light rays due to fluctuations of the gravitational potential, they can be directly related to the underlying density field of the large-scale structures. Weak gravitational surveys ar...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20011779