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

We present a cosmic microwave background (CMB) lensing map produced from a linear combination of South Pole Telescope (SPT) and \emph{Planck} temperature data. The 150 GHz temperature data from the $$2500\ {\rm deg}^{2}$$ SPT-SZ survey is combined with the \emph{Planck} 143 GHz data in harmonic space, to obtain a temperature map that has a broader $$\ell$$ 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 $$C_{L}^{\phi\phi}$$, and compare it to the theoretical prediction for a $$\Lambda$$CDM cosmology consistent with the \emph{Planck} 2015 data set, finding a best-fit amplitude of $$0.95_{-0.06}^{+0.06}({\rm Stat.})\! _{-0.01}^{+0.01}({\rm Sys.})$$. The null hypothesis of no lensing is rejected at a significance of $$24\,\sigma$$. 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, $$C_{L}^{\phi G}$$, between the SPT+\emph{Planck} lensing map and Wide-field Infrared Survey Explorer (\emph{WISE}) galaxies. We fit $$C_{L}^{\phi G}$$ to a power law of the form $$p_{L}=a(L/L_{0})^{-b}$$ with $$a=2.15 \times 10^{-8}$$, $b=1.35$, $$L_{0}=490$$, and find $$\eta^{\phi G}=0.94^{+0.04}_{-0.04}$$, which is marginally lower, but in good agreement with $$\eta^{\phi G}=1.00^{+0.02}_{-0.01}$$, the best-fit amplitude for the cross-correlation of \emph{Planck}-2015 CMB lensing and \emph{WISE} galaxies over $$\sim67\%$$ of the sky. The lensing potential map presented here will be used for cross-correlation studies with the Dark Energy Survey (DES), whose footprint nearly completely covers the SPT $$2500\ {\rm deg}^2$$ field.
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Publication Date:
Report Number(s):
FERMILAB-PUB-17-140-AE; arXiv:1705.00743
Journal ID: ISSN 1538-4357; 1597533
Grant/Contract Number:
AC02-07CH11359; AC02-76SF00515; PLR-124809; PHY-0114422; AC02-06CH11357; AC02-05CH11231
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 849; Journal Issue: 2; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); Gordon and Betty Moore Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; cosmic background radiation; gravitational lensing: weak; large-scale structure of universe; Gravitational lensing : general —
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1358105; OSTI ID: 1418209; OSTI ID: 1420120; OSTI ID: 1426762