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

T. Namikawa , Y. Chinone , H. Miyatake , M. Oguri , R. Takahashi , A. Kusaka , N. Katayama , S. Adachi , M. Aguilar , H. Aihara , A. Ali , R. Armstrong , K. Arnold , C. Baccigalupi , D. Barron , D. Beck (1) , S. Beckman , F. Bianchini , D. Boettger , J. Borrill , K. Cheung , L. Corbett , K.T. Crowley , H. El Bouhargani (1) , T. Elleflot , J. Errard (1) , G. Fabbian , C. Feng , N. Galitzki , N. Goeckner-Wald , J. Groh , T. Hamada , M. Hasegawa , M. Hazumi , C.A. Hill , L. Howe , O. Jeong , D. Kaneko , B. Keating , A.T. Lee , D. Leon , E. Linder , L.N. Lowry , A. Mangu , F. Matsuda , Y. Minami , S. Miyazaki , H. Murayama , M. Navaroli , H. Nishino , A.J. Nishizawa , A.T.P. Pham , D. Poletti , G. Puglisi , C.L. Reichardt , B.D. Sherwin , M. Silva-Feaver , P. Siritanasak , J.S. Speagle , R. Stompor (1) , A. Suzuki , P.J. Tait , O. Tajima , M. Takada , S. Takakura , S. Takatori , D. Tanabe , M. Tanaka , G.P. Teply , C. Tsai , C. Vergés (1) , B. Westbrook , Y. Zhou

1 APC (UMR_7164) - AstroParticule et Cosmologie

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.

Mots clés: cosmic background radiation: polarization; cosmic background radiation: temperature; lens; cosmic background radiation: power spectrum; galaxy; cosmological model: parameter space; dark matter: density; satellite: Planck; noise

Domaines: Astrophysique [astro-ph]

T. Namikawa, Y. Chinone, H. Miyatake, M. Oguri, R. Takahashi, et al.. Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from POLARBEAR and Cosmic Shear from Subaru Hyper Suprime-Cam. Astrophys.J., 2019, 882, pp.62. ⟨10.3847/1538-4357/ab3424⟩. ⟨hal-02116549⟩