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H. Groch (KPNO REU and Brown University), I. Dell'Antonio (Brown University), A. Dey, B.T. Jannuzi (NOAO), NDWFS Team
The NOAO Deep Wide-Field Survey (NDWFS) will provide accurate positions, magnitudes in three optical bands, and shape parameters in these bands for about 106 galaxies down to an R AB magnitude of 26 (5\sigma detection in a 2'' aperture). Because the NDWFS covers such a large area of sky with deep imaging, it is potentially a very important tool for gravitational lensing studies. We present the first results of an investigation into the feasibility of using this data for such a study. In particular, we characterize the variation of the size and shape of the point-spread function with respect to position in the images for each filter for 5 36' by 36' subfields of the NDWFS, in order to identify potential biases in the lensing data. We also present an analysis of the star/galaxy correlation as a means of testing for systematic effects in the lensing analysis. We present a quantitative analysis of the effects that need to be taken into account when using NDWFS data to study gravitational lensing.
The NOAO Deep Wide-Field Survey is being supported by the National Optical Astronomy Observatory which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation. Heather Groch's research was supported by the NOAO/KPNO REU Program, funded by the National Science Foundation.