power_spectral_density

powspec.power_spectral_density(img, res=1, bins=100, range=None, apod_size=None)

Return the bin averaged power spectral density of an image

Parameters:

imgarray_like or Quantity

the input (2D) image

resfloat or Quantity, optional

the resolution elements of the image

binsint or sequence of scalars or str, optional

If bins is an int, it defines the number of equal-width bins in the given range (10, by default). If bins is a sequence, it defines the bin edges, including the rightmost edge, allowing for non-uniform bin widths. (see histogram)

range(float, float) or str, optional

The lower and upper range of the bins. If not provided, range is simply (a.min(), a.max()). (see histogram). If range is a string, it defines the method used to calculate the bins, as defined by k_bin_edges.

Returns:

powspec_karray or Quantity

The value of the power spectrum, optionnaly with a units

bin_edgesarray of dtype float or Quantity

Return the bin edges (length(hist)+1).

Notes

If img as a unit of Jy/beam and res is in arcsec, the resulting unit is Jy**2 / beam**2 arcsec**2, by dividing the result per the square of the beam area (in say arcsec**2 / beam), one obtain Jy**2 / arcsec**2