Point Source Power in 3-year Wilkinson Microwave Anisotropy Probe Data

Details Point Source Power in 3-year Wilkinson Microwave Anisotropy Probe Data Point Source Power in 3-year Wilkinson Microwave Anisotropy Probe Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20924006h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #240.06; Bulletin of the American Astronomical Society,

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Using a set of multifrequency cross-spectra computed from the three year WMAP sky maps, we fit for the unresolved point source contribution. For a white noise power spectrum, we find a Q-band amplitude of A = 0.011 ± 0.001 muK^2 sr (antenna temperature), significantly smaller than the value of 0.017 ± 0.002 muK^2 sr used to correct the spectra in the WMAP release. Modifying the point source correction in this way largely resolves the discrepancy Eriksen et al. found between the WMAP Vand W-band power spectra. Correcting the co-added WMAP spectrum for both the low-l power excess due to a sub-optimal likelihood approximation---also reported by Eriksen et al.---and the high-l power deficit due to over-subtracted point sources---presented here---we find that the net effect in terms of cosmological parameters is a 0.7 sigma shift in n_s to larger values: For the combination of WMAP, BOOMERANG and ACBAR data, we find n_s = 0.969 ± 0.016, lowering the significance of n_s not equal to 1 from 2.7 sigma to 2.0 sigma. We acknowledge financial support from NASA and from the Research Council of Norway.

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