SALAT_CONVOLVE_BEAM

SALAT_CONVOLVE_BEAM

Convolve a specified synthetic beam (from an ALMA observations) to a user-provided map (e.g. from a simulation or observations with other instruments)

CALLING SEQUENCE:

IDL> convolved_cube = salat_convolve_beam(data, beam)

INPUTS / OPTIONAL KEYWORDS

Option	Description	Status
DATA	A Cube or a frame (in FITS format; as a string) to be convolved with the ALMA beam	required
PIXEL_SIZE	The pixel size (i.e., sampling resolution) of the DATA (in arcsec).	required
BEAM	Beam parameters [major_axis, minor_axis, beam_angle] all in degrees. It can be a 3-element array (i.e., mean of the beam parameters), or a [3,nt] array for a time series (i.e., time-varying parameters). If the latter, then nt (numebr of frames) should be equal to that in the DATA cube.	required
ALMA_CUBE	The SALSA level4 data cube in FITS format. If provided, the beam parameters are extracted from this cube (i.e., the BEAM keyword is ignored).	optional

OUTPUTS

Parameter	Description
CONVOLVED	Convolved Data cube or frame (same size as input DATA)

EXAMPLE

IDL> data = './bifrost_b3_frame400.fits'
IDL> pixel_size = 0.066 ; arcsec
IDL> alma_cube = './solaralma.b3.fba.20161222_141931-150707.2016.1.00423.S.level4.k.fits'
IDL> convolved = salat_convolve_beam(data, pixel_size=pixel_size, alma_cube=alma_cube)
IDL> sjim, data, /fits, w=4, iris='FUV', title='original input image'
IDL> sjim, convolved, w=6, iris='FUV', title='convolved image'

Source code

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