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Detection of warm and diffuse baryons in large scale structure from the cross correlation of gravitational lensing and the thermal Sunyaev-Zeldovich effect

Ludovic Van Waerbeke^1,*, Gary Hinshaw^1,2,†, and Norman Murray^3,4,‡

¹University of British Columbia, Department of Physics and Astronomy, 6224 Agricultural Road, V6T 1Z1 Vancouver, Canada
²Canada Research Chair in Observational Cosmology
³Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 Saint George Street, M5S 3H8 Toronto, Canada
⁴Canada Research Chair in Theoretical Astrophysics

^*waerbeke@phas.ubc.ca
^†hinshaw@phas.ubc.ca
^‡murray@cita.utotonto.ca

Phys. Rev. D 89, 023508 – Published 13 January, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.023508

Abstract

We report the first detection of a correlation between gravitational lensing by large scale structure and the thermal Sunyaev-Zeldovich (tSZ) effect. Using the mass map from the Canada France Hawaii Telescope Lensing Survey and a newly constructed tSZ map from Planck, we measure a nonzero correlation between the two maps out to one degree angular separation on the sky, with an overall significance of $6 σ$ . The tSZ maps are formed in a manner that removes primary cosmic microwave background fluctuations and minimizes residual contamination by galactic and extragalactic dust emission, and by CO line emission. We perform numerous tests to show that our measurement is immune to these residual contaminants. The resulting correlation function is consistent with the existence of a warm baryonic gas tracing the large scale structure with a bias $b_{gas}$ . Given the shape of the lensing kernel, our signal sensitivity peaks at a redshift $z \sim 0.4$ , where half a degree separation on the sky corresponds to a physical scale of $\sim 10 Mpc$ . The amplitude of the signal constrains the product $(b_{gas} / 1) (T_{e} / 0.1 keV) ({\bar{n}}_{e} / 1 m^{- 3}) = 2.01 \pm 0.31 \pm 0.21$ , at redshift zero. Our study suggests that a substantial fraction of the “missing” baryons in the Universe may reside in a low-density warm plasma that traces dark matter.

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