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 co-polarized beam (eg, Challinor et al 2000, astro-ph/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 $\ell$ 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 $\ell \leq 1024$.

RELATED ROUTINES

This section lists the routines related to gaussbeam

generate_beam

Routine returning a beam window function.

pixel_window

Routine returning a pixel window function.