Fig. 1

In the left panel, the WMAP W-band towards the M 31 galaxy. The 8.5° × 8.5° sky field centered at (121.17°,−21.57°) with the marked 4° circular region. The oblique strip indicates the M 31 disk, and the analysis in the halo region of M 31 galaxy is extended far beyond the region indicated in the figure. The detailed geometry (up to 8°) used in the analysis is shown in the right panel.
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