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Large-scale structure and the intrinsic alignment of galaxies

Published online by Cambridge University Press:  12 October 2016

Jonathan Blazek ,
Uroš Seljak  and
Rachel Mandelbaum
Jonathan Blazek*
Affiliation:
Center for Cosmology and AstroParticle Physics, Department of Physics, Ohio State University, Columbus, USA
Uroš Seljak
Affiliation:
Departments of Physics and Astronomy and Lawrence Berkeley National Laboratory, University of California, Berkeley, USA
Rachel Mandelbaum
Affiliation:
McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA
*
1 email: blazek@berkeley.edu
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Abstract

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Coherent alignments of galaxy shapes, often called“intrinsic alignments” (IA), are the most significant source of astrophysical uncertainty in weak lensing measurements. We develop the tidal alignment model of IA and demonstrate its success in describing observational data. We also describe a technique to separate IA from galaxy-galaxy lensing measurements. Applying this technique to luminous red galaxy lenses in the Sloan Digital Sky Survey, we constrain potential IA contamination from associated sources to be below a few percent.

Keywords

Gravitational lensing; large-scale structure of universe; cosmological parameters; galaxies: formationhalosevolution

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