Open AccessAngular power spectrum of the fastica cosmic microwave background component from Background Emission Anisotropy Scanning Telescope data
Author(s) -
Donzelli S.,
Maino D.,
Bersanelli M.,
Childers J.,
Figueiredo N.,
Lubin P. M.,
Meinhold P. R.,
O'Dwyer I. J.,
Seiffert M. D.,
Villela T.,
Wandelt B. D.,
Wuensche C. A.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10320.x
Subject(s) - cosmic microwave background , physics , cmb cold spot , astrophysics , cosmic background radiation , spectral density , telescope , anisotropy , astronomy , optics , statistics , mathematics
We present the angular power spectrum of the cosmic microwave background (CMB) component extracted with fastica from the Background Emission Anisotropy Scanning Telescope (BEAST) data. BEAST is a 2.2‐m off‐axis telescope with a focal plane comprising eight elements at Q (38–45 GHz) and Ka (26–36 GHz) bands. It operates from the UC (University of California) White Mountain Research Station at an altitude of 3800 m. The BEAST CMB angular power spectrum has already been 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 Wilkinson Microwave Anisotropy Probe ( WMAP ) data.