Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-27
Phys.Rev.D63:103002,2001
Astronomy and Astrophysics
Astrophysics
Replaced to match accepted PRD version. 12 pages, 11 figs. Map and covariance matrix at http://www.hep.upenn.edu/~xuyz/qmask.h
Scientific paper
10.1103/PhysRevD.63.103002
We present a method for comparing and combining maps with different resolutions and beam shapes, and apply it to the Saskatoon, QMAP and COBE/DMR data sets. Although the Saskatoon and QMAP maps detect signal at the 21 sigma and 40 sigma levels, respectively, their difference is consistent with pure noise, placing strong limits on possible systematic errors. In particular, we obtain quantitative upper limits on relative calibration and pointing errors. Splitting the combined data by frequency shows similar consistency between the Ka- and Q-bands, placing limits on foreground contamination. The visual agreement between the maps is equally striking. Our combined QMAP+Saskatoon map, nicknamed QMASK, is publicly available at www.hep.upenn.edu/~xuyz/qmask.html together with its 6495x6495 noise covariance matrix. This thoroughly tested data set covers a large enough area (648 square degrees -- currently the largest degree-scale map available) to allow a statistical comparison with COBE/DMR, showing good agreement.
de Oliveira-Costa Angélica
Devlin Mark J.
Herbig Thomas
Miller Amber D.
Netterfield Calvin. B.
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