Fit (sitelle.fit)

Introduction

Warning

For now, this module only works with a modified version of ORCS, not published yet !!

The fit module contains useful methods for fitting spectra. It has two specialized methods, fit_SN2 and fit_SN3 specifically dedicated to SN2 and SN3 filters, with a lot of default value to avoid some troubles.

Reference/API

sitelle.fit Module

Functions

sky_model_to_remove(mean_spectrum, axis, …)	This function shifts the velocity of a skymodel to match at best the skylines in a spectrum.
parse_line_params(rest_lines, fit[, error, …])	Parse the fitted parameters to display them as a nice DataFrame
chi2_func(axis, spectrum, fit_params[, delta])	Computes a chi square value only around fitted lines.
remove_OH_line(spectrum, theta, cube, **kwargs)	Function used to remove the strange Halpha line around -400km/s (probably OH line).
fit_gas_lines(z_dim, inputparams, params, …)	This function fit lines in a given spectrum.
guess_line_velocity(max_pos, v_min, v_max[, …])	Estimation of the velocity shift from a line position.
guess_source_velocity(spectrum, cube[, …])	Estimation of the velocity shift of a spectrum.
refine_velocity_guess(spectrum, axis, …[, …])	Refines a velocity guess with better accuracy, avoiding to have discrete guess corresponding to pixel numbers.
fit_spectrum(spec, theta, v_guess, cube[, lines])	Helper function to simplify fitting, with some default parameters being already set.
fit_source(xpos, ypos, cube[, v_guess, …])	Fit a spectrum from a position in the cube.
check_fit(source, SN2_ORCS, SN3_ORCS, …)	Convenience function to display a fit and visually check if it is meaningful.
fit_SN2(source, cube[, v_guess, v_min, …])	Function specialized to fit sources found in the SN2 cube.
fit_SN3(source, cube[, v_guess, lines, …])	Function specialized to fit sources found in the SN3 cube.