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Hill, J Colin; Spergel, David N
Journal of Cosmology and Astroparticle Physics, 02/2014, Letnik: 2014, Številka: 2Journal Article
The nominal mission maps from the Planck satellite contain a wealth of information about secondary anisotropies in the cosmic microwave background (CMB), including those induced by the thermal Sunyaev-Zel'dovich (tSZ) effect and gravitational lensing. We report the first detection of this cross-correlation signal, which wc measure at 6.2sigma significance using the Planck data. We interpret the signal using halo model calculations, which indicate that the tSZ-CMB lensing cross-correlation is a unique probe of the physics of intracluster gas in high-redshift, low-mass groups and clusters. Our results arc consistent with extrapolations of existing gas physics models to this previously unexplored regime and show clear evidence for contributions from both the one- and two-halo terms, but no statistically significant evidence for contributions from diffuse, unbound gas outside of collapsed halos. Our detection is a direct confirmation that hot, ionized gas traces the dark matter distribution over a wide range of scales in the universe (~0.1-50 Mpc/h).
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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