Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348111h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #481.11; Bulletin of the American Astronomical Society, Vol. 41, p.450
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 anticipate statistical constraints on the amplitude of matter clustering of 5%. Reaching these goals requires exquisite control of systematic errors; we describe the catalog produced so far on a subsample of the data for testing, and progress to date on quantifying and suppressing the point spread function-induced systematics.
Hirata Christopher
Huff Eric M.
Mandelbaum Rachel
Padmanabhan Nikhil
Schlegel David
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