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This routine generates the beam window function in multipole space of a gaussian beam parametrized by its FWHM. The polarization beam is also provided assuming a perfectly co-polarized beam (eg, Challinor et al 2000, astro-ph/0008228)

Location in HEALPix directory tree: src/f90/mod/alm_tools.f90


call gaussbeam( fwhm_arcmin, lmax, beam )


name & dimensionality kind in/out description
fwhm_arcmin DP IN FWHM of the gaussian beam in arcminutes.
lmax I4B IN maximum l value of the window function.
beam(0:lmax,1:p) DP OUT beam window function generated. The second index runs form 1:1 for temperature only, and 1:3 for polarisation. In the latter case, 1=T, 2=E, 3=B.


call gaussbeam(5.0_dp, 1024, beam)

Generates the window function of a gaussian beam of FWHM = 5 arcmin, for $l
\leq 1024$.


This section lists the routines related to gaussbeam

Routine returning a beam window function.
Routine returning a pixel window function.

Eric Hivon 2010-06-18
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