The Background Emission Anisotropy Scanning Telescope (BEAST) is a 2.2 m off-axis telescope with an eight-element mixed Q-band (38-45 GHz) and Ka-band (26-36 GHz) focal plane, designed for balloon-borne and ground-based studies of the cosmic microwave background (CMB). Here we present the CMB angular power spectrum calculated from 682 hr of data observed with the BEAST instrument. We use a binned pseudo-C-l estimator (the MASTER method). We find results that are consistent with other determinations of the CMB anisotropy for angular wavenumbers l between 100 and 600. We also perform cosmological parameter estimation. The BEAST data alone produce a good constraint on Omega(k) = 1 - Omega(tot) = 0.074 +/- 0.070, consistent with a flat universe. A joint parameter estimation analysis with a number of previous CMB experiments produces results consistent with previous determinations.
The cosmic microwave background anisotropy power spectrum from the BEAST experiment / I.J. O'Dwyer, M. Bersanelli, J. Childers, N. Figueiredo, D. Halevi, G. Huey, P.M. Lubin, D. Maino, N. Mandolesi, J. Marvil, P.R. Meinhold, J. Mejia, P. Natoli, H. O'Neill, A. Pina, M.D. Seiffert, N.C. Stebor, C. Tello, T. Villela, B.D. Wandelt, B. Williams, C.A. Wuensche. - In: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. - ISSN 0067-0049. - 158:1(2005), pp. 93-100. [10.1086/429089]
The cosmic microwave background anisotropy power spectrum from the BEAST experiment
M. BersanelliSecondo
;D. Maino;
2005
Abstract
The Background Emission Anisotropy Scanning Telescope (BEAST) is a 2.2 m off-axis telescope with an eight-element mixed Q-band (38-45 GHz) and Ka-band (26-36 GHz) focal plane, designed for balloon-borne and ground-based studies of the cosmic microwave background (CMB). Here we present the CMB angular power spectrum calculated from 682 hr of data observed with the BEAST instrument. We use a binned pseudo-C-l estimator (the MASTER method). We find results that are consistent with other determinations of the CMB anisotropy for angular wavenumbers l between 100 and 600. We also perform cosmological parameter estimation. The BEAST data alone produce a good constraint on Omega(k) = 1 - Omega(tot) = 0.074 +/- 0.070, consistent with a flat universe. A joint parameter estimation analysis with a number of previous CMB experiments produces results consistent with previous determinations.
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