ABOUT LAMBDA

Tegmark et al. (TOH) Reduced-Foreground CMB Map

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:
Galactic
Projection Type:
13´
Resolution:
HEALPix, nested, res 9 (Nside=512)
Download Links:

From the abstract of Tegmark, de Oliveira-Costa, & Hamilton: "We perform an independent foreground analysis of the WMAP maps to produce a cleaned CMB map useful for cross-correlation with, e.g., galaxy and X-ray maps. We use a variant of the Tegmark & Efstathiou (1996) technique that is completely blind, making no assumptions about the CMB power spectrum, the foregrounds, WMAP detector noise or external templates. Compared with the foreground-cleaned internal linear combination map produced by the WMAP team, our map has the advantage of containing less non-CMB power (from foregrounds and detector noise) outside the Galactic plane. The difference is most important on the angular scale of the first acoustic peak and below, since our cleaned map is at the highest (13') rather than lowest (49') WMAP resolution. We also produce a Wiener filtered CMB map, representing our best guess as to what the CMB sky actually looks like. We argue that our CMB map is clean enough that the lowest multipoles can be measured without any galaxy cut."

More details can be found in:

A high resolution foreground cleaned CMB map from WMAP", M. Tegmark, A. de Oliveira-Costa, & A. Hamilton, PRD 68, 123523 (2003).

A method for subtracting foregrounds from multifrequency CMB sky maps" M. Tegmark and G. Efstathiou, Mon. Not. R. Astron. Soc. 281, 1297 (1996).

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
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
Web Curator: Mr. Michael R. Greason