Open AccessThe synchrotron foreground and the cosmic microwave background temperature–polarization cross‐correlation power spectrum from the first‐year WMAP data
Author(s) -
Bernardi G.,
Carretti E.,
Fabbri R.,
Sbarra C.,
Cortiglioni S.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2005.00092.x
Subject(s) - cmb cold spot , cosmic microwave background , synchrotron , physics , astrophysics , cosmic background radiation , polarization (electrochemistry) , synchrotron radiation , multipole expansion , spectral density , astronomy , optics , anisotropy , chemistry , statistics , mathematics , quantum mechanics
We analyse the temperature–polarization cross‐correlation in the Galactic synchrotron template that we have recently developed, and between the template and cosmic microwave background (CMB) temperature maps derived from WMAP data. Since the polarized synchrotron template itself uses WMAP data, we can estimate residual synchrotron contamination in the CMB C TE ℓ angular spectrum. While C TE 2 appears to be contaminated by synchrotron, no evidence for contamination is found in the multipole range which is most relevant for the fit of the cosmological optical depth.