butter_band

gunagala.optical_filter.butter_band(w, w1, w2, N, scale=0.95)

Simple Butterworth bandpass filter function in wavelength space.

Parameters:

w : astropy.units.Quantity

Wavelength

w1 : astropy.units.Quantity

Wavelength of short wavelength edge of bandpass

w2 : astropy.units.Quantity

Wavelength of long wavelength edge of bandpass

N : int

Order of the Butterworth function

scale : float, optional

Scaling to apply to the transmission of the Butterworth function, default 0.95

Returns:

transmission : astropy.units.Quantity

Filter transmission at wavelength w.