kinextract
Non-parametric binned-LOSVD spectral fitter for galaxy kinematics.
kinextract fits galaxy spectra using a non-parametric line-of-sight
velocity distribution (LOSVD) represented directly on a velocity grid – no
Gauss-Hermite parametrisation assumed. When continuum co-fitting is enabled
(FitConfig.fit_continuum = True), a penalized-B-spline continuum is
folded directly into the same single optimization as the LOSVD and template
weights (see kinextract.joint), rather than fit as a separate
sub-fit. Alternatively, a spectrum can be pre-normalized once (e.g. via the
standalone asymmetric-least-squares utility,
kinextract.continuum.asymmetric_least_squares_continuum()) and fit
with fit_continuum = False. Regularization strength is
selected automatically. The package uses spectroscopic data for use in
stellar dynamical modeling.