Weak Lensing in the Sloan Southern Stripe

Details Weak Lensing in the Sloan Southern Stripe Weak Lensing in the Sloan Southern Stripe

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5506h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #55.06; Bulletin of the American Astronomical Society, Vol. 39, p.826

Astronomy and Astrophysics

Astronomy

Scientific paper

We are conducting an analysis of weak lensing of coadded data drawn from the Sloan Digital Sky Survey's equatorial Stripe 82. These data cover 250 sq. degrees in all SDSS bands (ugriz) down to a limiting magnitude of r 24, allowing shape measurements for galaxies two full 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 of the SDSS sample where cosmic shear measurements are possible. Galaxy-galaxy and cluster-galaxy lensing are also feasible with these data, and we plan to include these measurements in a final analysis. We anticipate constraints on σ_8 of ± 0.05 (stat). Reaching these goals requires exquisite control of systematic errors; we discuss progress to date on quantifying and suppressing the point spread function-induced systematics. This task is made much easier by the multiple PSF measurements in thirty repeated scans over the whole of the stripe.

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