healpixwindow
healpixwindow computes the l space window function due to the finite size of the HEALPix pixels. The typical size of a pixel (square root of its uniform surface area) isarcmin. If a unpixelised sky has a power spectrum C(l ), the same sky pixelised with a resolution parameter Nside will have the power spectrum C(l )pix = C(l )W(l )2 where W(l ) is given by healpixwindow (Nside). The polarized pixel window function is also provided (when Dim > 1). This routine reads some FITS files located in the subdirectory data/ of the HEALPix distribution, unless the keyword Directory is set otherwise.
wpix = healpixwindow(256) |
wpix contains the window function in {0,...,1024} of the HEALPix pixel with resolution parameter 256 (pixel size of 13.7 arcmin)
Eric Hivon 2003-02-07