
gaussbeam
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
copolarized beam (eg, Challinor et al 2000, astroph/0008228) Location in HEALPix directory tree:
src/f90/mod/alm_tools.f90
FORMAT call gaussbeam(
fwhm_arcmin, lmax, beam
)
ARGUMENTS
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. 
EXAMPLE:
call gaussbeam(5.0_dp, 1024, beam)
Generates the window function of a gaussian beam of FWHM = 5 arcmin, for .
RELATED ROUTINESThis section lists the routines related to gaussbeam

generate_beam
 Routine returning a beam
window function.

pixel_window
 Routine returning a pixel
window function.
Eric Hivon
20100618

