bl2beam
This IDL facility computes a circular beam profile
from its transfer (or window) function b(l).
Location in HEALPix directory tree: src/idl/misc/bl2beam.pro
FORMAT
QUALIFIERS
-
bl
- input b(l) window function of beam (defined for all integer multipoles l starting at 0)
-
theta
- angles
(in arcmin, degrees or radians)
at which the output beam
is to be computed.
KEYWORDS
-
/ARCMIN
- if set,
is in arcmin
-
/DEGREES
- if set,
is in degrees
-
/HELP
- if set, prints out the help header and exits
-
/RADIANS
- if set,
is in radians
DESCRIPTION
Since an arbitrary beam is related to its SH Transform via
 |
(3) |
 |
(4) |
 |
(5) |
RELATED ROUTINES
This section lists the routines related to bl2beam
-
idl
- version 6.4 or more is necessary to run bl2beam.
-
beam2bl
- facility to perform the inverse
transform to bl2beam.
-
bl2fits
- facility to write a b(l) window function into a FITS file.
-
fits2cl
- facility to read a b(l) window
function from a FITS file
EXAMPLE:
the example above generates a beam window function (defined for
all l in
) for a 15arcmin-FWHM gaussian beam, computes the
beam profile for angles in [0,30] arcmin and then plots it.
Version 3.31, 2016-08-26