A 2500 deg 2 CMB Lensing Map from Combined South Pole Telescope and Planck Data

  • Omori Y
  • Chown R
  • Simard G
  • et al.
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Abstract

We present a cosmic microwave background (CMB) lensing map produced from a linear combination of South Pole Telescope (SPT) and Planck temperature data. The 150 GHz temperature data from the 2500 deg 2 SPT-SZ survey is combined with the Planck 143 GHz data in harmonic space to obtain a temperature map that has a broader ℓ coverage and less noise than either individual map. Using a quadratic estimator technique on this combined temperature map, we produce a map of the gravitational lensing potential projected along the line of sight. We measure the auto-spectrum of the lensing potential , and compare it to the theoretical prediction for a ΛCDM cosmology consistent with the Planck 2015 data set, finding a best-fit amplitude of . The null hypothesis of no lensing is rejected at a significance of 24 σ . One important use of such a lensing potential map is in cross-correlations with other dark matter tracers. We demonstrate this cross-correlation in practice by calculating the cross-spectrum, , between the SPT+ Planck lensing map and Wide-field Infrared Survey Explorer ( WISE ) galaxies. We fit to a power law of the form with a , L 0 , and b fixed, and find , which is marginally lower, but in good agreement with , the best-fit amplitude for the cross-correlation of Planck -2015 CMB lensing and WISE galaxies over ∼67% of the sky. The lensing potential map presented here will be used for cross-correlation studies with the Dark Energy Survey, whose footprint nearly completely covers the SPT 2500 deg 2 field.

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Omori, Y., Chown, R., Simard, G., Story, K. T., Aylor, K., Baxter, E. J., … Zahn, O. (2017). A 2500 deg 2 CMB Lensing Map from Combined South Pole Telescope and Planck Data. The Astrophysical Journal, 849(2), 124. https://doi.org/10.3847/1538-4357/aa8d1d

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