Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724401s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #244.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Following Sawangwit & Shanks (2010), we stack WMAP 7-year data around extragalactic point sources to probe deviations in the source profiles from the Jupiter-modeled WMAP beams. Like them, we find that the stacked source profiles are broader than the WMAP model beam. Subtracting a foreground model changes the stacked profiles significantly, particularly at Q-band, but even after subtraction, the profiles appear significantly wider than the WMAP models in the Q-, V-, and W-bands, and have much heavier tails.
While ground-based CMB measurements and cross-correlations with WMAP data mean that serious problems with the WMAP beam models are unlikely, the too-broad source profiles still require explanation. We explore several possibilities with parametric fits to the stacked profiles, probing the source frequency spectrum and positional uncertainty. These explanations appear to be unlikely candidates. Finally, we explore the selection bias at the faint end of the WMAP catalog, where sources lying along the same line of sight as a positive CMB fluctuation may be boosted above the WMAP catalog threshold.
Huffenberger Kevin Michael
Schultz Kasey
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