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Showing 1 to 7 of 7 for “"peculiar velocities"”.
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The Impact of Peculiar Velocities on Supernova Cosmology
Thesis We investigate the impact of correlated peculiar velocities on the accuracy of the estimated cosmological parameters calculated using type Ia supernovae. We use mock galaxy catalogues constructed from the Millennium Simulation, the largest dark matter N-body simulation run to date. …
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From Spitzer mid-infrared observations and measurements of peculiar velocities to constrained simulations of the local universe
… simulations are constrained solely by peculiar velocities. The process is successful as resulting simulations resemble the Local Universe. The major attractors and voids are simulated at positions approaching observational positions by a few megaparsecs, thus reaching the limit imposed …
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Interaction between Galaxies and the Intergalactic Medium at z = 3
… et al. (2005) with our parameters. We found the peculiar velocities had a smaller effect in the combined data compared to only VLT data. This may be because smaller redshift errors in Steidel et al. (2003). By computing and fitting ξ (s)/ξ (r), we get β = 0.14 at z = 3. This gives a bias factor, b …
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Relativistic corrections to weak lensing convergence
… observations is not biased? Induced by gravity, peculiar velocity of galaxies can potentially be used to probe the growth of structure in our universe. Peculiar velocities induce a lensing-like effect, which we consider as Doppler magnification. By developing new statistical tools which are based …
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Peculiar flow fields in the zone of avoidance from the near-infrared Tully-Fisher relation
… the southern Zone of Avoidance as derived from peculiar motions of galaxies. The peculiar velocities were derived from a galaxy sample based on the systematic deep Parkes HI Zone of Avoidance survey (HIZOA) using a newly optimized Near InfraRed (NIR) Tully-Fisher (TF) relation. The NIR imaging …
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Motions of galaxies in the nearby universe with 2MASS
… tracing baryonic matter in the nearby Universe. Peculiar velocities are reconstructed self-consistently with a density-field based upon groups identified in the 2MRS KS < 11.75 catalog. The model predicts infall toward Virgo, Perseus-Pisces, Hydra-Centaurus, Norma, Coma, Shapley and Hercules, and …
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A Study on Quenching and Galaxy Growth in z~1 Clusters using HST WFC3 Grism Observations
… as a laboratory. Cluster galaxies have high peculiar velocities, making mergers between them rare. Since minor mergers are expected to increase galaxy size more than they do stellar mass, the most direct way to test this is to measure the stellar mass--size relations in both the cluster and …