Research articles

search articles

My Pages

Stat

Members: 3645
Articles: 2'506'133
Articles rated: 2609

26 April 2024

» arxiv » 1510.9217

Article overview

BICEP2 / Keck Array VI: Improved Constraints On Cosmology and Foregrounds When Adding 95 GHz Data From Keck Array
Keck Array ; BICEP2 Collaborations ; P. A. R. Ade ; Z. Ahmed ; R. W. Aikin ; K. D. Alexander ; D. Barkats ; S. J. Benton ; C. A. Bischoff ; J. J. Bock ; R. Bowens-Rubin ; J. A. Brevik ; I. Buder ; E. Bullock ; V. Buza ; J. Connors ; B. P. Crill ; L. Duband ; C. Dvorkin ; J. P. Filippini ; S. Fliescher ; J. Grayson ; M. Halpern ; S. Harrison ; G. C. Hilton ; H. Hui ; K. D. Irwin ; K. S. Karkare ; E. Karpel ; J. P. Kaufman ; B. G. Keating ; S. Kefeli ; S. A. Kernasovskiy ; J. M. Kovac ; C. L. Kuo ; E. M. Leitch ; M. Lueker ; K. G. Megerian ; C. B. Netterfield ; H. T. Nguyen ; R. O'Brient ; R. W. Ogburn IV ; A. Orlando ; C. Pryke ; S. Richter ; R. Schwarz ; C. D. Sheehy ; Z. K. Staniszewski ; B. Steinbach ; R. V. Sudiwala ; G. P. Teply ; K. L. Thompson ; J. E. Tolan ; C. Tucker ; A. D. Turner ; A. G. Vieregg ; A. C. Weber ; D. V. Wiebe ; J. Willmert ; C. L. Wong ; W. L. K. Wu ; K. W. Yoon ;
Date:	30 Oct 2015
Abstract:	We present results from an analysis of all data taken by the BICEP2 & Keck Array CMB polarization experiments up to and including that taken during the 2014 observing season. This includes the first Keck Array observations at 95 GHz. The maps reach a depth of 50 nK deg in Stokes $Q$ and $U$ in the 150 GHz band and 127 nK deg in the 95 GHz band. We take auto- and cross-spectra between these maps and publicly available maps from WMAP and Planck at frequencies from 23 GHz to 353 GHz. An excess over lensed-LCDM is detected at modest significance in the 95x150 $BB$ spectrum, and is consistent with the dust contribution expected from our previous work. No significant evidence for synchrotron emission is found in spectra such as 23x95, or for dust/sync correlation in spectra such as 23x353. We take the likelihood of all the spectra for a multi-component model including lensed-LCDM, dust, synchrotron and a possible contribution from inflationary gravitational waves (as parametrized by the tensor-to-scalar ratio $r$), using priors on the frequency spectral behaviors of dust and synchrotron emission from previous analyses of WMAP and Planck data in other regions of the sky. This analysis yields an upper limit $r_{0.05}<0.09$ at 95% confidence, which is robust to variations explored in analysis and priors. Combining these $B$-mode results with the (more model-dependent) constraints from Planck analysis of CMB temperature and other evidence yields a combined limit $r_{0.05}<0.07$. These are the strongest constraints to date on inflationary gravitational waves.
Source:	arXiv, 1510.9217
Services:	Forum \| Review \| PDF \| Favorites

No review found.

Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

ScienXe.org
» my Online CV
» Free

News, job offers and information for researchers and scientists:

home

contact

sitemap