Bibcode
Schwarz, R.; Savini, G.; Savelainen, M.; Santos, D.; Sandri, M.; Rusholme, B.; Rubiño-Martín, J. A.; Rowan-Robinson, M.; Roudier, G.; Rossetti, M.; Rocha, G.; Ristorcelli, I.; Richter, S.; Renzi, A.; Renault, C.; Remazeilles, M.; Reinecke, M.; Reach, W. T.; Rebolo, R.; Rachen, J. P.; Puget, J.-L.; Pryke, C.; Prunet, S.; Pratt, G. W.; Ponthieu, N.; Polenta, G.; Pointecouteau, E.; Plaszczynski, S.; Piat, M.; Pietrobon, D.; Pettorino, V.; Piacentini, F.; Perdereau, O.; Perotto, L.; Pearson, T. J.; Patanchon, G.; Pasian, F.; Partridge, B.; Paladini, R.; Pajot, F.; Pagano, L.; Orlando, A.; Ogburn, R. W.; O'Brient, R.; Novikov, I.; Novikov, D.; Noviello, F.; Nguyen, H. T.; Nørgaard-Nielsen, H. U.; Netterfield, C. B.; Natoli, P.; Nati, F.; Naselsky, P.; Murphy, J. A.; Moss, A.; Munshi, D.; Mortlock, D.; Morgante, G.; Montier, L.; Moneti, A.; Miville-Deschênes, M.-A.; Mitra, S.; Migliaccio, M.; Mennella, A.; Mendes, L.; Melchiorri, A.; Meinhold, P. R.; Megerian, K. G.; Matarrese, S.; Mason, P.; Masi, S.; Martínez-González, E.; Martin, P. G.; Maris, M.; Mangilli, A.; Mandolesi, N.; Maino, D.; Maffei, B.; Macías-Pérez, J. F.; Lubin, P. M.; Lueker, M.; López-Caniego, M.; Linden-Vørnle, M.; Liguori, M.; Lilje, P. B.; Lewis, A.; Levrier, F.; Leonardi, R.; Leitch, E. M.; Lawrence, C. R.; Lattanzi, M.; Lasenby, A.; Lamarre, J.-M.; Lähteenmäki, A.; Lagache, G.; Kuo, C. L.; Kurki-Suonio, H.; Kunz, M.; Krachmalnicoff, N.; Knox, L. et al.
Bibliographical reference
Physical Review Letters, Volume 114, Issue 10, id.101301
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3
2015
Journal
Citations
925
Refereed citations
798
Description
We report the results of a joint analysis of data from BICEP2/Keck
Array and Planck. BICEP2 and Keck Array have observed the same
approximately 400 deg2 patch of sky centered on RA 0 h, Dec.
-57.5 ° . The combined maps reach a depth of 57 nK deg in Stokes Q
and U in a band centered at 150 GHz. Planck has observed the full sky in
polarization at seven frequencies from 30 to 353 GHz, but much less
deeply in any given region (1.2 μ K deg in Q and U at 143 GHz). We
detect 150 ×353 cross-correlation in B modes at high significance.
We fit the single- and cross-frequency power spectra at frequencies
≥150 GHz to a lensed-Λ CDM model that includes dust and a
possible contribution from inflationary gravitational waves (as
parametrized by the tensor-to-scalar ratio r), using a prior on the
frequency spectral behavior of polarized dust emission from previous
Planck analysis of other regions of the sky. We find strong evidence for
dust and no statistically significant evidence for tensor modes. We
probe various model variations and extensions, including adding a
synchrotron component in combination with lower frequency data, and find
that these make little difference to the r constraint. Finally, we
present an alternative analysis which is similar to a map-based cleaning
of the dust contribution, and show that this gives similar constraints.
The final result is expressed as a likelihood curve for r, and yields
an upper limit r0.05<0.12 at 95% confidence. Marginalizing
over dust and r, lensing B modes are detected at 7.0 σ
significance.
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