Angular power spectrum of the FastICA CMB component from BEAST data

Details Angular power spectrum of the FastICA CMB component from BEAST data Angular power spectrum of the FastICA CMB component from BEAST data

2005-07-12

arxiv.org/abs/astro-ph/0507267v2

Mon.Not.Roy.Astron.Soc.369:441-448,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10320.x

We present the angular power spectrum of the CMB component extracted with FastICA from the Background Emission Anisotropy Scanning Telescope (BEAST) data. BEAST is a 2.2 meter off-axis telescope with a focal plane comprising 8 elements at Q (38-45 GHz) and Ka (26-36 GHz) bands. It operates from the UC White Mountain Research Station at an altitude of 3800 meters. The BEAST CMB angular power spectrum has been already calculated by O'Dwyer et.al. using only the Q band data. With two input channels FastICA returns two possible independent components. We found that one of these two has an unphysical spectral behaviour while the other is a reasonable CMB component. After a detailed calibration procedure based on Monte-Carlo (MC) simulations we extracted the angular power spectrum for the identified CMB component and found a very good agreement with the already published BEAST CMB angular power spectrum and with the WMAP data.

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