Global ETD Search
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Showing 1 to 5 of 5 for “"cosmology: observations"”.
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‘Powellsnakes’, a fast Bayesian approach to discrete object detection in multi-frequency astronomical data sets
… of the contemporary precision observational cosmology state-of-the-art. Two catalogue products are already released: (i) A point sources catalogue [Planck Collaboration et al., 2011e], (ii) A catalogue of galaxy clusters [Planck Collaboration et al., 2011f]. Many other contributions, in …
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Development and Testing of a New Method for Velocity-Selecting White Dwarfs from Gaia by Galactic Population
… galaxies form remains an open question in modern cosmology. Observations of the current configuration of spiral galaxies including the Milky Way reveal thin and thick disk and halo populations which must all be accounted for in formation theories and likely have distinct ages. Using the Milky Way …
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Modeling large scale structure from photometric surveys
We present our measurements and analysis for the systematic tests, the galaxy two-point angular correlation function, and the best halo-occupation distribution (HOD) model fit for galaxies and compact galaxy groups selected from the seventh data release of the Sloan Digital Sky Survey. The galaxy …
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Properties of Galaxies Detected in Emission and Absorption with Background Quasars
… systems relate to present day galaxies. Observations of these systems detected through absorption in background quasar spectra indicate the DLAs are metal poor and slowly evolving while their counterparts, the sub-DLAs, are highly enriched. In order to determine the relationship between …
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The HI Lyman-alpha opacity at redshift 2.7 < z < 3.6
… energy input of ionizing sources into the IGM. Observations suggest that the HI Lyman-alpha effective optical depth, τ_eff, decreases with decreasing redshift, which is primarily due to the expansion of the Universe. However, some studies find a smaller value of the effective optical depth than …