First measurement of the cross-correlation of CMB lensing and galaxy lensing
Abstract
We measure the cross-correlation of cosmic microwave background (CMB) lensing convergence maps derived from Atacama Cosmology Telescope data with galaxy lensing convergence maps as measured by the Canada-France-Hawaii Telescope Stripe 82 Survey. The CMB-galaxy lensing cross power spectrum is measured for the first time with a significance of 4.2 σ , which corresponds to a 12% constraint on the amplitude of density fluctuations at redshifts ∼0.9 . With upcoming improved lensing data, this novel type of measurement will become a powerful cosmological probe, providing a precise measurement of the mass distribution at intermediate redshifts and serving as a calibrator for systematic biases in weak lensing measurements.
- Publication:
-
Physical Review D
- Pub Date:
- March 2015
- DOI:
- 10.1103/PhysRevD.91.062001
- arXiv:
- arXiv:1311.6200
- Bibcode:
- 2015PhRvD..91f2001H
- Keywords:
-
- 98.62.Sb;
- 98.70.Vc;
- Gravitational lenses and luminous arcs;
- Background radiations;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 11 pages, 7 figures. Submitted to PRD. Updates to lensing maps and analysis pipeline, with revised results, increased significance