NOAO >   Observing Info >   Approved Programs >   2004B-0160

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Proposal Information for 2004B-0160


PI: Peter Garnavich, University of Notre Dame, pgarnavi@miranda.phys.nd.edu
Address: Physics Department, 225 Nieuwland Hall, Notre Dame, IN 46566, US

CoI: Liliya L.R. Williams, University of Minnesota
CoI: Jason Rhodes, California Institute of Technology
CoI: Joseph Gallagher, University of Notre Dame

Title: Anomalously Large Lensing Signature in High Redshift Supernovae

Abstract: The brightness residuals of distant type Ia supernovae show a correlation with the foreground density of galaxies measured from APM plate scans. This appears to be the first detection of gravitational weak lensing of supernova light by large-scale structure and provides a probe of the dark matter distribution that complements lensing shear measured through galaxy shape. But the amplitude of this correlation is surprisingly large and can not be explained by standard models of mass distributions. We propose to employ deep, wide-field imaging to greatly improve the mapping of large-scale structure along the line-of-sight to ~80 published high-redshift type Ia supernovae. This program will significantly increase the size of the sample used to detect the correlation and map structures at redshifts optimum for lensing. For a subset of the fields with the highest and lowest supernova magnifications, we will obtain multiple colors and perform a galaxy- shear weak-lensing analysis to make an independent check of the foreground density.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2004B-0160

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