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Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from POLARBEAR and Cosmic Shear from Subaru Hyper Suprime-Cam

  • Namikawa, T.
  • Chinone, Y.
  • Miyatake, H.
  • Oguri, M.
  • Takahashi, R.
  • Kusaka, A.
  • Katayama, N.
  • Adachi, S.
  • Aguilar, M.
  • Aihara, H.
  • Ali, A.
  • Armstrong, R.
  • Arnold, K.
  • Baccigalupi, C.
  • Barron, D.
  • Beck, D.
  • Beckman, S.
  • Bianchini, F.
  • Boettger, D.
  • Borrill, J.
  • And 53 more
Publication Date
May 01, 2019
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We present the first measurement of cross-correlation between the lensing potential, reconstructed from cosmic microwave background (CMB) $\textit{polarization}$ data, and the cosmic shear field from galaxy shapes. This measurement is made using data from the POLARBEAR CMB experiment and the Subaru Hyper Suprime-Cam (HSC) survey. By analyzing an 11 deg$^2$ overlapping region, we reject the null hypothesis at $3.5\sigma$ and constrain the amplitude of the cross power spectrum to $\hat{A}_{\rm lens}=1.70\pm 0.48$, where $\hat{A}_{\rm lens}$ is the amplitude normalized with respect to the Planck prediction, based on the flat $\Lambda$ cold dark matter cosmology. The first measurement of this cross power spectrum, without relying on CMB temperature measurements, is possible due to the deep POLARBEAR map with a noise level of $\sim 6\mu$K arcmin, as well as the deep HSC data with a high galaxy number density of $n_g=23$ arcmin$^{-2}$. We present a detailed study of the systematics budget to show that residual systematics in our results are negligibly small, which demonstrates the future potential of this cross-correlation technique.

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