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An astronomical spectral map analysis package

Project description

General Description

Spec_map_analysis is a spectral map analysis package. The package contains modules that allow for the fitting of emission lines in spectral maps, resampling and convolution of images, and derivation of emission line ratios and subsequently electron densities.

  • The emission line fitting module can fit a single emission line with a Gaussian profile and optionally a polynomial continuum component. The spectral fitting is performed independently for each spatial pixel using a non-linear least squares method.

  • The resampling and convolution module resamples one image to another image's pixel resolution, and then convolves either image to the specified spatial resolution. The convolution allows for the propagation of uncertainties, assuming they are correlated, using the method presented in Klein (2021).

  • The line ratio and electron density module allow for the derivation of specified line ratios and subsequently, electron density maps using atomic data from PyNeb. Aperture photometry can also be performed on the line intensity maps, and then used to calculate line ratios and electron densities for aperture regions.


Spec_map_analysis has the following requirements:

Spec_map_analysis also has optionally dependencies on:

  • photutils 1.1 or later: To derive aperture photometry.
  • matplotlib 3.3 or later: To plot images.
  • emcee 3.0 or later: To fit spectral maps using an MCMC algorithm.


Spec_map_analysis can be downloaded, installed and upgraded using pip.

To install only the required packages, run:

pip install spec_map_analysis

To install all package dependencies, run:

pip install spec_map_analysis[all_dep]

To install directly from the GitHub repository, run:

pip install git+


The manual can be found here.

Reporting Issues

If you happen to find a bug in spec_map_analysis, please report it by creating a new issue on the spec_map_analysis GitHub issue tracker. Please include an example of the issue that allows for its reproduction, so the problem can be fixed.

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