CCAPP Seminar: "Measuring the scale-dependence of intrinsic alignments using multiple shear estimates" Danielle Leonard (CMU)

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November 14, 2017
11:30AM - 12:30PM
Location
PRB 4138

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Add to Calendar 2017-11-14 11:30:00 2017-11-14 12:30:00 CCAPP Seminar: "Measuring the scale-dependence of intrinsic alignments using multiple shear estimates" Danielle Leonard (CMU) The next generation of cosmological surveys promises significant advancements in the field of weak gravitational lensing. As such, it is crucial that relevant systematic effects such as the intrinsic alignment of galaxies are well-understood. I will discuss a new method for measuring the scale-dependence of the intrinsic alignment contamination to the galaxy-galaxy lensing signal, which takes advantage of multiple shear estimates applied to the same data set. For a galaxy-galaxy lensing measurement which uses LSST sources and DESI lenses, the signal-to-noise on the intrinsic alignment signal measured by our method is forecast to improve on an existing method (Blazek et al. 2012) by a factor of ~3, for optimally chosen pairs of shear estimates. PRB 4138 Center for Cosmology and AstroParticle Physics (CCAPP) ccapp@osu.edu America/New_York public
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The next generation of cosmological surveys promises significant advancements in the field of weak gravitational lensing. As such, it is crucial that relevant systematic effects such as the intrinsic alignment of galaxies are well-understood. I will discuss a new method for measuring the scale-dependence of the intrinsic alignment contamination to the galaxy-galaxy lensing signal, which takes advantage of multiple shear estimates applied to the same data set. For a galaxy-galaxy lensing measurement which uses LSST sources and DESI lenses, the signal-to-noise on the intrinsic alignment signal measured by our method is forecast to improve on an existing method (Blazek et al. 2012) by a factor of ~3, for optimally chosen pairs of shear estimates.

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