Karlsruhe 2011 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 8: Kosmologie
GR 8.1: Vortrag
Donnerstag, 31. März 2011, 08:30–08:50, 20.40: 101
(contribution withdrawn) Angular Size Test for Galaxies at Low Redshift with SDSS — •Alexander Unzicker1 and Karl Fabian2 — 1Pestalozzi-Gymnasium München — 2Geological Survey of Norway, Trondheim
Based on magnitudes and Petrosian radii from the Sloan Digital Sky Survey (DR 7) at low redhift (z <0.2), we perform a test of galaxy size evolution. Since size is obviously correlated to absolute magnitude, the analysis critically depends on the appropriate selection. Several possible artifacts are considered: the Malmquist bias is excluded by using volume-limited samples, and a correction for seeing is applied. We tested also different K-corrections and determined the dependence on the Hubble constant and on other cosmological parameters. We noted a slight increase of average galaxy size with time which is stable across a wide range of luminosities. However, taking into account to the recently discovered luminosity evolution with redshift, the effect is almost reversed. This result raises some questions whether the standard view of galaxy evolution is supported by observations. To facilitate further investigations, the Mathematica code and instructions for data download are publicly available.