MEASUREMENT OF COSMIC MICROWAVE BACKGROUND POLARIZATION POWER SPECTRA FROM TWO YEARS OF BICEP DATA-猫眼课题宝

DOI：

10.1088/0004-637x/711/2/1123

发表时间：

2009-06

期刊：

The Astrophysical Journal

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中科院分区：

其他

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作者：

H. Chiang;H. Chiang;P. Ade;D. Barkats;D. Barkats;J. Battle;E. Bierman;J. Bock;J. Bock;C. Dowell;L. Duband;E. Hivon;W. Holzapfel;V. Hristov;W. Jones;W. Jones;B. Keating;J. Kovac;Chaohua Kuo;A. Lange;A. Lange;E. Leitch;P. Mason;T. Matsumura;H. Nguyen;N. Ponthieu;C. Pryke;S. Richter;G. Rocha;G. Rocha;C. Sheehy;Y. Takahashi;J. Tolan;K. W. Yoon

Background Imaging of Cosmic Extragalactic Polarization (Bicep) is a bolometric polarimeter designed to measure the inflationary B-mode polarization of the cosmic microwave background (CMB) at degree angular scales. During three seasons of observing at the South Pole (2006 through 2008), Bicep mapped ∼2% of the sky chosen to be uniquely clean of polarized foreground emission. Here, we present initial results derived from a subset of the data acquired during the first two years. We present maps of temperature, Stokes Q and U, E and B modes, and associated angular power spectra. We demonstrate that the polarization data are self-consistent by performing a series of jackknife tests. We study potential systematic errors in detail and show that they are sub-dominant to the statistical errors. We measure the E-mode angular power spectrum with high precision at 21 ⩽ ℓ ⩽ 335, detecting for the first time the peak expected at ℓ ∼ 140. The measured E-mode spectrum is consistent with expectations from a ΛCDM model, and the B-mode spectrum is consistent with zero. The tensor-to-scalar ratio derived from the B-mode spectrum is r = 0.02+0.31−0.26, or r < 0.72 at 95% confidence, the first meaningful constraint on the inflationary gravitational wave background to come directly from CMB B-mode polarization.

MEASUREMENT OF COSMIC MICROWAVE BACKGROUND POLARIZATION POWER SPECTRA FROM TWO YEARS OF BICEP DATA

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