gaussian_psf¶

artpop.image.gaussian_psf(fwhm, pixel_scale=0.2, shape=41, mode='center', factor=10)[source]¶

Gaussian point-spread function.

Parameters

fwhmfloat or Quantity

Full width at half maximum of the psf. If a float is given, the units will be assumed to be arcsec. The units can be angular or in pixels.

pixel_scalefloat or Quantity, optional

The pixel scale of the psf image. If a float is given, the units are assumed to be arcsec per pixel (why would you want anything different?).

shapeint or list-like, optional

Shape of the psf image. Must be odd. If an int is given, the x and y dimensions will be set to this value: (shape, shape).

modestr, optional

One of the following discretization modes:

‘center’ (default)
Discretize model by taking the value at the center of the bin.
‘linear_interp’
Discretize model by linearly interpolating between the values at the corners of the bin.
‘oversample’
Discretize model by taking the average on an oversampled grid.
‘integrate’
Discretize model by integrating the model over the bin. Very slow.

factornumber, optional

Factor of oversampling. Default factor = 10. If the factor is too large, evaluation can be very slow.

Returns