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.; 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.; Jeune, M. Le; 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.; Zahn, A.. - 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.
