WMAP DR3 Foreground Reduced Sky Maps Per Differencing Assembly

The data made available through this page has been updated. The most recent version of this data may be accessed through https://lambda.gsfc.nasa.gov/product/wmap/current/"

Coordinate System:
Projection Type:
HEALPix, nested, res 9 (Nside=512) and res 10 (Nside=1024)
0.23°- 0.93° (frequency dependent)
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The foreground reduced skymaps were produced by removing a foreground model from the'unreduced' maps using the Foreground Template Model discussed in Hinshaw, et.al., 2006and Page, et.al, 2006; see those papers for details. Briefly, synchrotron, free-free, and dust emission templates weremodeled and then subtracted from the single year 'unreduced' maps. The goal was to produce a setof maps with the foreground removed while retaining WMAP's noise characteristics.

Because the K and Ka maps were used to produce the foreground models, only Q, V, and W band foreground reduced maps were created and delivered to LAMBDA.

As with the 'unreduced' maps, full three year maps were produced by performing a weighted,pixel-by-pixel, mean of the three single year maps; the N_Obs measurement was used to weight this mean.The N_Obs measurements were added together to produce the final, three year, N_Obs measurement.

The same foreground template model was used to produce foreground reduced high resolution (res 10) V and W maps.

The table of noise levels, σ0, for the full-resolution, foreground-reduced maps were updated on 2 June 2009
to correct an error. The previously posted values were inadvertantly copied from the 3-year release.
ISigmas 1.436 1.470 2.254 2.141 3.314 2.953 5.899 6.565 6.926 6.761
PSigmas 1.453 1.488 2.278 2.163 3.341 2.975 5.929 6.602 6.964 6.800

Additional Information

Back To WMAP DR3: Full Resolution Seven Year Sky Maps

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Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
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