Namikawaw, 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, Fabbian, Giulio, The Polarbear Collaboration, and the Subaru HSC SSP Collaboration, (2019) Evidence for the cross-correlation between cosmic icrowave background polarization lensing from Polarbear and cosmic shear from Subaru Hyper Suprime-Cam. Astrophysical Journal, 882 (1). p. 62. ISSN 0004-637X

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Abstract

We present the first measurement of cross-correlation between the lensing potential, reconstructed from cosmic microwave background (CMB) 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 deg2 overlapping region, we reject the null hypothesis at 3.5σ and constrain the amplitude of the cross-spectrum to Alens = 1.70 +/- 0.48, where Alens is the amplitude normalized with respect to the Planck 2018 prediction, based on the flat Λ cold dark matter cosmology. The first measurement of this cross- spectrum without relying on CMB temperature measurements is possible owing to the deep POLARBEAR map with a noise level of ∼6μKarcmin, as well as the deep HSC data with a high galaxy number density of ng = 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.

Item Type:	Article
Keywords:	cosmic background radiation, cosmology: observations, gravitational lensing: weak, polarization, Astrophysics - Cosmology and Nongalactic Astrophysics
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups:	Astronomy Centre
Subjects:	Q Science Q Science > QB Astronomy Q Science > QB Astronomy > QB0980 Cosmogony. Cosmology
Depositing User:	Giulio Fabbian
Date Deposited:	07 Oct 2019 16:15
Last Modified:	07 Oct 2019 16:30
URI:	http://sro.sussex.ac.uk/id/eprint/86861

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