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2017ApJ...848..121P - Astrophys. J., 848, 121-121 (2017/October-3)

A measurement of the cosmic microwave background B-mode polarization power spectrum at subdegree scales from two years of POLARBEAR data.

POLARBEAR COLLABORATION, ADE P.A.R., AGUILAR M., AKIBA Y., ARNOLD K., BACCIGALUPI C., BARRON D., BECK D., BIANCHINI F., BOETTGER D., BORRILL J., CHAPMAN S., CHINONE Y., CROWLEY K., CUKIERMAN A., DUNNER R., DOBBS M., DUCOUT A., ELLEFLOT T., ERRARD J., FABBIAN G., FEENEY S.M., FENG C., FUJINO T., GALITZKI N., GILBERT A., GOECKNER-WALD N., GROH J.C., HALL G., HALVERSON N., HAMADA T., HASEGAWA M., HAZUMI M., HILL C.A., HOWE L., INOUE Y., JAEHNIG G., JAFFE A.H., JEONG O., KANEKO D., KATAYAMA N., KEATING B., KESKITALO R., KISNER T., KRACHMALNICOFF N., KUSAKA A., LE JEUNE M., LEE A.T., LEITCH E.M., LEON D., LINDER E., LOWRY L., MATSUDA F., MATSUMURA T., MINAMI Y., MONTGOMERY J., NAVAROLI M., NISHINO H., PAAR H., PELOTON J., PHAM A.T.P., POLETTI D., PUGLISI G., REICHARDT C.L., RICHARDS P.L., ROSS C., SEGAWA Y., SHERWIN B.D., SILVA-FEAVER M., SIRITANASAK P., STEBOR N., STOMPOR R., SUZUKI A., TAJIMA O., TAKAKURA S., TAKATORI S., TANABE D., TEPLY G.P., TOMARU T., TUCKER C., WHITEHORN N. and ZAHN A.

Abstract (from CDS):

We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the POLARBEAR experiment at 150 GHz. By adding new data collected during the second season of observations (2013-2014) to re-analyzed data from the first season (2012-2013), we have reduced twofold the band-power uncertainties. The band powers are reported over angular multipoles 500 ℓ2100, where the dominant B-mode signal is expected to be due to the gravitational lensing of E-modes. We reject the null hypothesis of no B-mode polarization at a confidence of 3.1σ including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Λ Cold Dark Matter (ΛCDM) framework by fitting for a single lensing amplitude parameter AL relative to the Planck 2015 best-fit model prediction. We obtain AL=0.60–0.24+0.26(stat)–0.04+0.00(inst) ± 0.14(foreground) ± 0.04(multi), where AL=1 is the fiducial ΛCDM value.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmic background radiation - cosmology: observations - large-scale structure of universe - large-scale structure of universe

Simbad objects: 1

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