Cosmic Shear in the Sloan Digital Sky Survey

Details Cosmic Shear in the Sloan Digital Sky Survey Cosmic Shear in the Sloan Digital Sky Survey

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560302h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #603.02; Bulletin of the American Astronomical Society, Vol. 36, p.1125

Astronomy and Astrophysics

Astronomy

Scientific paper

We are conducting an analysis of weak gravitational lensing in coadded data drawn from the Sloan Digital Sky Survey's equatorial stripe. These data cover 250 square degrees in all SDSS bands (ugriz) down to a limiting magnitude of r 23.5, allowing shape measurements for galaxies almost two magnitudes fainter than the main survey for a mean redshift of 0.5 (as compared with 0.3 for the main survey). The resulting increased number density makes this the only region in the SDSS sample where cosmic shear measurements are possible. Higher-redshift galaxy-galaxy and cluster-galaxy lensing are also feasible with these data. We describe the catalogs produced, quantify our control of systematic errors, and present our first measurements of the lensing signal.

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