The Galaxy-Galaxy Lensing Contribution to the Cosmic Shear Two-Point Function
- 10 January 2007
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 655 (1) , L1-L4
- https://doi.org/10.1086/511674
Abstract
We note that galaxy-galaxy lensing by non-spherical galaxy halos produces a net anti-correlation between the shear of background galaxies and the ellipticity of foreground galaxies. This anti-correlation would contaminate the tomographic cosmic shear two point function if the effect were not taken into account. We compare the size of the galaxy-galaxy lensing contribution to the change in the cosmic shear two-point correlation function due to a change in the dark energy equation of state w of 1%. We find them comparable on scales <~5 arcmin for NFW galaxy profiles, and out to much larger scales for SIE profiles. However the galaxy-galaxy lensing signal has a characteristic spatial and redshift pattern which should allow it to be removed.Keywords
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This publication has 29 references indexed in Scilit:
- Potential sources of contamination to weak lensing measurements: constraints from N-body simulationsMonthly Notices of the Royal Astronomical Society, 2006
- Cosmology with photometric redshift surveysMonthly Notices of the Royal Astronomical Society, 2005
- Intrinsic alignment-lensing interference as a contaminant of cosmic shearPhysical Review D, 2004
- Halo Asphericity and the Shear Three‐Point FunctionThe Astrophysical Journal, 2004
- Properties of Galaxy Dark Matter Halos from Weak LensingThe Astrophysical Journal, 2004
- Weak gravitational lensing: reducing the contamination by intrinsic alignmentsMonthly Notices of the Royal Astronomical Society, 2003
- Spin‐induced Galaxy Alignments and Their Implications for Weak‐Lensing MeasurementsThe Astrophysical Journal, 2001
- Weak gravitational lensingPhysics Reports, 2001
- Detection of weak gravitational lensing by large-scale structureMonthly Notices of the Royal Astronomical Society, 2000
- Tidal torques and local density maximaMonthly Notices of the Royal Astronomical Society, 1988