The speaker will be Dr. Ofer Lahav
Place: Holcblat Hall
Time: Wednesday, 25/Dec/2002, 14:00
TITLE:
"The 2dF Galaxy Redshift Survey:"
Cosmological Parameters and Galaxy Biasing"
The 2dF Galaxy Redshift Survey (2dFGRS) has already measured over 220,000 redshifts of nearby (median z ~ 0.1) galaxies. It allows us to estimate fundamental cosmological parameters and to divide the survey into subsets according to the galaxy spectra. The large-scale structure analysis of the survey has already yielded several significant results:
(i) the shape of the power spectrum of fluctuations is consistent with the Lambda-Cold Dark Matter concordance model;
(ii) An upper limit of 2 eV for the total mass of neutrinos;
(iii) from joint analysis of the 2dFGRS data with the Cosmic Microwave Background anisotropies the linear-theory rms mass fluctuations is sigma_8 ~ 0.8;
(iv) The biasing parameter of bright galaxies on scales > 10 Mpc/h is nearly unity but on smaller scales red galaxies are more strongly clustered than blue galaxies.