Halo Masses and Profiles, and Dark Matter Power Spectrum Measurements with the SDSS Main and LRG Samples

Details Halo Masses and Profiles, and Dark Matter Power Spectrum Measurements with the SDSS Main and LRG Samples Halo Masses and Profiles, and Dark Matter Power Spectrum Measurements with the SDSS Main and LRG Samples

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.6805m&link_type=abstract

American Astronomical Society Meeting 208, #68.05; Bulletin of the American Astronomical Society, Vol. 38, p.148

Astronomy and Astrophysics

Astronomy

Scientific paper

In this talk, I will discuss recent results from weak lensing measurements using the SDSS Main and LRG samples over the SDSS DR4 and DR5 survey area. First, I consider the relationship between stellar mass, luminosity, and halo mass determined using halo model analysis of the lensing signal. This analysis is done separately for early and late-type galaxies, using the DR4 Main spectroscopic sample over a large range in stellar mass and luminosity, and allows us to constrain satellite fractions as well. Next, I describe a similar analysis in which we constrain the average halo profiles of the DR5 spectroscopic LRG sample, finding results that are consistent with N-body simulations of dark matter halos with masses 5×1013 M&sun;/h, i.e. group-sized halos. Finally, I show preliminary constraints on the dark matter power spectrum via a comparison of the lensing signal (the galaxy-dark matter cross-correlation) with the galaxy-galaxy autocorrelation. This comparison allows us to constrain both the bias of these galaxies, and the power spectrum amplitude σ8.

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