Measurement of a Cosmographic Distance Ratio with Galaxy and Cosmic Microwave Background Lensing

Hironao Miyatake, Mathew S. Madhavacheril, Neelima Sehgal, Anže Slosar, David N. Spergel, Blake Sherwin, Alexander Van Engelen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We measure the gravitational lensing shear signal around dark matter halos hosting constant mass galaxies using light sources at z∼1 (background galaxies) and at the surface of last scattering at z∼1100 (the cosmic microwave background). The galaxy shear measurement uses data from the CFHTLenS survey, and the microwave background shear measurement uses data from the Planck satellite. The ratio of shears from these cross-correlations provides a purely geometric distance measurement across the longest possible cosmological lever arm. This is because the matter distribution around the halos, including uncertainties in galaxy bias and systematic errors such as miscentering, cancels in the ratio for halos in thin redshift slices. We measure this distance ratio in three different redshift slices of the constant mass (CMASS) sample and combine them to obtain a 17% measurement of the distance ratio, r=0.390-0.062+0.070, at an effective redshift of z=0.53. This is consistent with the predicted ratio from the Planck best-fit cold dark matter model with a cosmological constant cosmology of r=0.419.

Original languageEnglish (US)
Article number161301
JournalPhysical review letters
Issue number16
StatePublished - Apr 17 2017

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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