B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data

Details B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.373l..93c&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 373, Issue 1, pp. L93-L97.

Astronomy and Astrophysics

Astronomy

5

Polarization, Radiation Mechanisms: Non-Thermal, Cosmic Microwave Background, Diffuse Radiation, Radio Continuum: Ism

Scientific paper

We study the contamination of the B-mode of the cosmic microwave background polarization (CMBP) by Galactic synchrotron in the lowest emission regions of the sky. The 22.8-GHz polarization map of the 3-yr Wilkinson Microwave Anisotropy Probe (WMAP) data release is used to identify and analyse such regions. Two areas are selected with signal-to-noise ratio S/N < 2 and S/N < 3, covering ~16 and ~26 per cent fraction of the sky, respectively. The polarization power spectra of these two areas are dominated by the sky signal on large angular scales (multipoles l < 15), while the noise prevails on degree scales. Angular extrapolations show that the synchrotron emission competes with the CMBP B-mode signal for tensor-to-scalar perturbation power ratio T/S = 10-3-10-2 at 70 GHz in the 16 per cent lowest emission sky (S/N < 2 area). These values worsen by a factor ~5 in the S/N < 3 region. The novelty is that our estimates regard the whole lowest emission regions and outline a contamination better than that of the whole high Galactic latitude sky found by the WMAP team (T/S > 0.3). Such regions allow T/S ~ 10-3 to be measured directly which approximately corresponds to the limit imposed by using a sky coverage of 15 per cent. This opens interesting perspectives on the investigation of the inflationary model space in lowest emission regions.

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