log_rebin

ndmapper.lib.gmos.spec.ifu.log_rebin(*args, **kwargs)

Resample the wavelength axis of each x-y-lambda data cube onto constant increments in log(wavelength), ie. constant redshift per pixel. The output WCS is defined according to the FITS paper III convention (equation 5).

This function depends on the pyfu PyRAF/Python package, which must be installed separately.

Parameters:

inputs : DataFileList or DataFile

Data cubes with linear WCSs in wavelength (each one mapped to a FITS extension named ‘SCI’ for compatibility with PyFU), as produced by resample_to_cube or mosaic.

out_names : str-like or list of str-like, optional

Names of output files containing the re-binned datacubes. If None (default), the names of the DataFile instances returned will be constructed from those of the corresponding input files, prefixed with ‘l’.

conserve_flux : bool

Conserve flux per pixel? The default of False conserves flux density, which is appropriate for data that have been calibrated in physical flux units (per Angstrom, nm or micron), as opposed to counts or electrons per pixel.

Processing is currently performed using the PyFU function “pyflogbin”.

Returns:

DataFileList

The output data cubes, resampled to logarithmic increments in wavelength.