barak.convolve.convolve_constant_dv¶

barak.convolve.convolve_constant_dv(wa, fl, wa_dv=None, npix=4.0, vfwhm=None)[source]¶

Convolve a wavelength array with a gaussian of constant velocity width.

If vfwhm is specified an intermediate wavelength array with constant velocity pixel width is calculated. Otherwise, both wa_dv and npix must be given – this is faster because no intermediate array needs to be calculated.

Parameters :

fl, wa : arrays of floats, length N The array to be convolved and its wavelengths. vfwhm : float, optional Full width at half maximum in velocity space (km/s) of the gaussian kernel with which to convolve fl. npix : float, default 4 Number of pixels corresponding to vfwhm in wa_dv if given, otherwise wa is interpolated to an array with velocity pixel width = vfwhm / npix. wa_dv : array of floats, default None Wavelength array with a constant velocity width (this can be generated with make_constant_dv_wa_scale()).

Returns :

fl_out : array of length N fl convolved with the gaussian kernel with the specified FWHM.