Welcome to pyplatefit documentation!

pyplatefit is a python routine for emission and absorption lines fit of MUSE spectra. It is inspired by the IDL routine Platefit originally developed by Christy Tremonti, Jarle Brinchmann for the SDSS project (Tremonti et al. 2004;. Brinchmann et al. 2004). The continuum fit is a direct python translation of the IDL routines. The emission and absorption line fitting has been completely rewritten from scratch in python using the lmfit python fitting module. Compared to the original IDL version, the python routine offer the following improvements:

• Asymmetric gaussian single and double fit for the lyman-alpha line

• Separate fit for resonant lines

• Allow various minimization algorithms

• Improved Equivalent width estimate

• Flexibility of a python code

• Improved error estimate using MCMC emcee python module

The continuum fitting code has been developed by Madusha Gunawardhana and the original line fitting code was developed by Yannick Roehlly. Jarle Brinchmann provide critical help in the validation process and explanation of the original IDL code. The final code is developed and maintained by Roland Bacon. If you use this software, please cite Bacon et al, 2023, A&A, 670, A4.

Contents:

• Installation
• Pyplatefit tutorial
  • Introduction
  • Importing modules
  • Basic usage
  • Improving error estimate using MCMC
  • Selecting and updating emission/absorption lines
  • Adjusting fit parameters
  • LSF
  • Advanced usage
  • Output results in detail
• Changelog
  • v0.7 (09/06/2021)
  • v0.6 (30/01/2021)
  • v0.5 (17/01/2021)
  • v0.4 (24/03/2020)
  • v0.3 (19/10/2019)
  • v0.2 (19/04/2019)
  • v0.1 (12/04/2019)

API

pyplatefit Package

Functions

fit_abs(wave, data, std, redshift, *[, ...])
fit_lines(wave, data, std, redshift, *[, ...])	Fit lines from a set of arrays (wave, data, std) using lmfit.
fit_spec(spec, z[, fit_all, ziter, fitcont, ...])	perform platefit cont and line fitting on a spectra
get_lines([iden, orig, z, vac, restframe, ...])	Return a table of lines
plot_fit(ax, result[, line_only, abs_line, ...])	plot fitting results obtained with fit_spec
print_res(result, family)	print results obtained with fit_spec
show_lines(ax, lines[, dl, y, fontsize])

Classes

Contfit()	This class is a python version of Platefit continuum fit
EquivalentWidth()	This class implement Equivalength Width computation
Linefit([vel, vdisp, velabs, vdispabs, ...])	This class implement Emission Line fit
Platefit([contpars, linepars, eqwpars, ...])	This class is a poorman version of Platefit.