New interface

# Joint analysis of BICEP2/ keck array and Planck data

13 LERMA - LERMA Cergy
LERMA (UMR_8112) - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères
35 Astrophysics Group
Blackett Laboratory
Abstract : 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 deg$^2$ patch of sky centered on RA 0h, Dec. −57.5deg. The combined maps reach a depth of 57nK 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 μK 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 above 150 GHz to a lensed-ΛCDM model that includes dust and a possible contribution from inflationary gravitational waves (as parameterized by the tensor-to-scalar ratio r). 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 7.0σ significance.
Document type :
Journal articles
Domain :

https://hal.archives-ouvertes.fr/hal-01593518
Contributor : Jérôme Planès Connect in order to contact the contributor
Submitted on : Wednesday, January 12, 2022 - 3:12:25 PM
Last modification on : Tuesday, December 6, 2022 - 4:09:25 AM
Long-term archiving on: : Wednesday, April 13, 2022 - 11:08:25 PM

### File

Publisher files allowed on an open archive

### Citation

A. Ade, N. Aghanim, Z. Ahmed, R. Aikin, D. Alexander, et al.. Joint analysis of BICEP2/ keck array and Planck data. Physical Review Letters, 2015, 114 (10), pp.101301. ⟨10.1103/PhysRevLett.114.101301⟩. ⟨hal-01593518⟩

Record views