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2019ApJ...882...62N - Astrophys. J., 882, 62-62 (2019/September-1)

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., CHEUNG K., CORBETT L., CROWLEY K.T., EL BOUHARGANI H., ELLEFLOT T., ERRARD J., FABBIAN G., FENG C., GALITZKI N., GOECKNER-WALD N., GROH J., HAMADA T., HASEGAWA M., HAZUMI M., HILL C.A., HOWE L., JEONG O., KANEKO D., KEATING B., LEE A.T., LEON D., LINDER E., LOWRY L.N., MANGU A., MATSUDA F., MINAMI Y., MIYAZAKI S., MURAYAMA H., NAVAROLI M., NISHINO H., NISHIZAWA A.J., PHAM A.T.P., POLETTI D., PUGLISI G., REICHARDT C.L., SHERWIN B.D., SILVA-FEAVER M., SIRITANASAK P., SPEAGLE J.S., STOMPOR R., SUZUKI A., TAIT P.J., TAJIMA O., TAKADA M., TAKAKURA S., TAKATORI S., TANABE D., TANAKA M., TEPLY G.P., TSAI C., VERGES C., WESTBROOK B., ZHOU Y. (The Polarbear Collaboration and the Subaru HSC SSP Collaboration)

Abstract (from CDS):

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 ∼6 µK arcmin, as well as the deep HSC data with a high galaxy number density of ng=23arcmin–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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmic background radiation - cosmology: observations - gravitational lensing: weak - polarization

Simbad objects: 1

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