Omori, Y., Chown, R., Simard, G., Story, K. T., Aylor, K., Baxter, E. J., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Cho, H. -M, Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Everett, W. B., George, E. M., Halverson, N. W., Harrington, N. L., Holder, G. P., Hou, Z., Holzapfel, W. L., Hrubes, J. D., Knox, L., Lee, A. T. et al. 2017. "A 2500 deg2 CMB Lensing Map from Combined South Pole Telescope and Planck Data." The Astrophysical Journal, 849 124. https://doi.org/10.3847/1538-4357/aa8d1d.
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 deg2 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 {C}Lf f , and compare it to the theoretical prediction for a ?CDM cosmology consistent with the Planck 2015 data set, finding a best-fit amplitude of {0.95}-0.06+0.06({stat}.{)}-0.01+0.01({sys}.). The null hypothesis of no lensing is rejected at a significance of 24s. 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, {C}Lf G, between the SPT+Planck lensing map and Wide-field Infrared Survey Explorer (WISE) galaxies. We fit {C}Lf G to a power law of the form {p}L=a{(L/{L}0)}-b with a, L 0, and b fixed, and find {? }f G={C}Lf G/{p}L={0.94}-0.04+0.04, which is marginally lower, but in good agreement with {? }f G={1.00}-0.01+0.02, the best-fit amplitude for the cross-correlation of Planck-2015 CMB lensing and WISE galaxies over ˜67%25 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 deg2 field.
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 deg2 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 {C}Lφ φ , and compare it to the theoretical prediction for a ΛCDM cosmology consistent with the Planck 2015 data set, finding a best-fit amplitude of {0.95}-0.06 0.06({stat}.{)}-0.01 0.01({sys}.). The null hypothesis of no lensing is rejected at a significance of 24σ. 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, {C}Lφ G, between the SPT Planck lensing map and Wide-field Infrared Survey Explorer (WISE) galaxies. We fit {C}Lφ G to a power law of the form {p}L=a{(L/{L}0)}-b with a, L 0, and b fixed, and find {η }φ G={C}Lφ G/{p}L={0.94}-0.04 0.04, which is marginally lower, but in good agreement with {η }φ G={1.00}-0.01 0.02, 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 deg2 field.
