Halo ellipticity of GAMA galaxy groups from KiDS weak lensing
نویسندگان
چکیده
منابع مشابه
Galaxy Halo Masses from Weak Gravitational Lensing
In this review, I discuss the use of galaxy-galaxy weak lensing measurements to study the masses of dark matter halos in which galaxies reside. After summarizing how weak gravitational lensing measurements can be interpreted in terms of halo mass, I review measurements that were used to derive the relationship between optical galaxy mass tracers, such as stellar mass or luminosity, and dark mat...
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...
متن کاملMass-to-light Ratios of Galaxy Groups from Weak Lensing
We present the findings of our weak lensing study of a sample of 116 CNOC2 galaxy groups. The lensing signal is used to estimate the mass-to-light ratio of these galaxy groups. The best fit isothermal sphere model to our lensing data has an Einstein radius of 0. 88±0. 12, which corresponds to a shearweighted velocity dispersion of 245±18 km s. The mean mass-to-light ratio within 1 h Mpc is 185±...
متن کاملA Detection of Dark Matter Halo Ellipticity Using Galaxy Cluster Lensing in Sdss
We measure the ellipticity of isolated clusters of galaxies in the Sloan Digital Sky Survey (SDSS) using gravitational lensing. We stack the clusters, rotating so that the major axes of the ellipses determined by the positions of cluster member galaxies are aligned. We exclude the signal from the central 0.5 h Mpc to avoid problems with stacking alignment and cluster member contamination. We fi...
متن کاملIntrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys
We use a large set of state-of-the-art cosmological N-body simulations [512 particles] to study the intrinsic ellipticity correlation functions of halos. With the simulations of different resolutions, we find that the ellipticity correlations converge once the halos have more than 160 members. For halos with fewer members, the correlations are underestimated, and the underestimation amounts to ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2017
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stx344