# Point-Source Power in 3 Year Wilkinson Microwave Anisotropy Probe Data

Source: [Point-Source Power in 3 Year Wilkinson Microwave Anisotropy Probe Data](<https://www.sota2.com/research/paper/68fa2a111e209131ce839c41>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T03:14:19.264Z

Authors: K. M. Huffenberger, H. K. Eriksen, F. K. Hansen

Published: 2006-06-21T21:05:13.000Z

## Abstract

Using a set of multifrequency cross spectra computed from the 3 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 that Eriksen et al. found between the WMAP V- and W-band power spectra. Correcting the co-added WMAP spectrum for both the low-l power excess due to a suboptimal likelihood approximation--also reported by Eriksen et al.--and the high-l power deficit due to oversubtracted point sources--presented in this Letter--we find that the net effect in terms of cosmological parameters is an \\~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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/astro-ph/0606538>)

[PDF](<https://arxiv.org/pdf/astro-ph/0606538.pdf>)