Background Subtraction

cwitools.analysis.bg_subtract(inputfits, method='polyfit', poly_k=1, median_window=31, zmask=(0, 0), zunit='A')

Subtracts extended continuum emission / scattered light from a cube

Parameters:

• cubePath (str) – Path to the data cube to be subtracted.
• method (str) – Which method to use to model background ‘polyfit’: Fits polynomial to the spectrum in each spaxel (default.) ‘median’: Subtract the spatial median of each wavelength layer. ‘medfilt’: Model spectrum in each spaxel by median filtering it. ‘noiseFit’: Model noise in each z-layer and subtract mean.
• poly_k (int) – The degree of polynomial to use for background modeling.
• median_window (int) – The filter window size to use if median filtering.
• zmask (int tuple) – Wavelength region to mask, given as tuple of indices.
• zunit (str) – If using zmask, indices are given in these units. ‘A’: Angstrom (default) ‘px’: pixels
• saveModel (bool) – Set to TRUE to save background model cube.
• fileExt (str) – File extension to use for output (Default: .bs.fits)