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 ⤠â ⤠2100, 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 3.1Ï including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Î Cold Dark Matter (ÎCDM) framework by fitting for a single lensing amplitude parameter AL= 0.60 +0.26-0.24(stat)+0.00-0.04(inst) ± 0.14(foreground) ± 0.04(multi), where AL= 1 relative to the Planck 2015 best-fit model prediction. We obtain ±0.14(foreground) ±0.04(multi), where is the fiducial ÎCDM value.
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data / 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., Dünner, R., Dobbs, M., Ducout, A., Elleflot, T., Errard, J., Fabbian, G., et al.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 848:2(2017), pp. 1-15. [10.3847/1538-4357/aa8e9f]
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data
Baccigalupi, C.;Bianchini, F.;Fabbian, G.;Krachmalnicoff, N.;Poletti, D.;Puglisi, G.;
2017-01-01
Abstract
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 ⤠â ⤠2100, 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 3.1Ï including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Î Cold Dark Matter (ÎCDM) framework by fitting for a single lensing amplitude parameter AL= 0.60 +0.26-0.24(stat)+0.00-0.04(inst) ± 0.14(foreground) ± 0.04(multi), where AL= 1 relative to the Planck 2015 best-fit model prediction. We obtain ±0.14(foreground) ±0.04(multi), where is the fiducial ÎCDM value.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
