Measuring the Mass of the Universe with SDSS Weak Lensing

Details Measuring the Mass of the Universe with SDSS Weak Lensing Measuring the Mass of the Universe with SDSS Weak Lensing

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..aprb14014m&link_type=abstract

American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.

Physics

Scientific paper

Inhomogeneities in the distribution of mass in the Universe are revealed by the distortions they create in the images of distant galaxies. Measurements of this gravitational lensing allow detection of mass where no luminous test masses exist and in regions which are not in dynamical equilibrium. We measure the lensing masses of more than 40,000 galaxies observed by the Sloan Digital Sky Survey. All lens galaxies have spectroscopically determined redshifts and highly accurate CCD photometry. Galaxy masses are determined on halo scales, out to radii of 250 h-1 kpc. We determine scaling relations between mass and luminosity in the five SDSS passbands, from u^' to z^'. By combining these mass-to-light scaling relations with SDSS measurements of the galaxy luminosity function, we place strong constraints on the cosmic density of mass associated with galaxies.

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