beamDiskOverlap {astroFns} | R Documentation |
Gaussian beam and disk overlap with shift
Description
Calculate the overlap integral of a 2-D Gaussian beam and a uniform disk, including a shift between the centers of the beam and disk.
Usage
beamDiskOverlap(s = 0, r = 1, theta.fwhm = 1)
Arguments
s |
Shift between centers |
r |
Disk radius |
theta.fwhm |
Gaussian beam FWHM |
Details
Converts the 2-D integral to 1-D for speed. Use consistent units.
Value
Value of the overlap integral, normalized to unity for a beam much smaller than the disk.
Author(s)
Andrew Harris
References
"Telescope illumination and beam measurements for submillimeter astrononomy," A.I. Harris, Internat. J. IR and mm Waves, 9, 231 (1988)
Examples
s <- seq(0, 10, 0.1)
plot(s, beamDiskOverlap(s, 4, 1), t='l', col=4)
[Package astroFns version 4.2-1 Index]