Density of the Universe from 2MASS catalog

TYPEAstrophysics Seminar
Speaker:Mr. Maciej Bilicki
Affiliation:N. Copernicus Astronomical Center
Location:Lidow 620

The universal density of non-relativistic matter, Omega_m, is one of the most important cosmological parameters. Although now well constrained from such probes as CMB, Supernovae Ia or galaxy clusters, it is usually measured in combination with other parameters. I will show how to estimate it independently of those analyses, using the clustering dipole of galaxies from the 2 Micron All Sky Survey Extended Source Catalog. The first method is to compare the growth of the dipole with theoretical expectations. The second consists in using the optimal window function of the 2MASS catalog. First results give Omega_m=0.20+-0.07.