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sharpener is a tool to identify the position of all continuum sources in a continuum image and extract a spectrum from each line of sight of these sources.

Project description


This is a set of tools that have been developed in preparation of the HI absorption surveys of the SKA precursors and pathfinders.

sharpener identifies the position of all continuum sources in a continuum image and extracts a spectrum against all their lines of sight. The spectra are then plotted. Multiple options can be provided by the user, such has hanning smoothing and polynomial fitting and subtraction of the spectra, and plotting the spectra in different units (km/s, Hz, Jy beam$^{-1}$, $\tau$). Further information are given in the next sections.

sharpener can be run automatically using a .yml parameter file as run_sharpener -c <parameter_file.yml>, or through a IPython notebook.

To generate config with run_sharpener -gd <parameter_file.yml> and for help run_sharpener -h.

The following tutorials can guide you through the different capabilities of sharpener.



  • SHARPener makes use of the most common python packages (e.g. numpy, scipy, astropy, astroquery, prettytable) and addition to mpdaf and pypdf2.
  • The parameter file is in yaml format, hence pyaml, and json packages should be installed.
  • Tutorials make use of tabulate and glob for fancy outputs.
  • SHARPener source finder calls the function imsad of Miriad. Miriad must be installed for the source finder to work properly. No python wrapper is needed, since it is already included in SHARPener.

Insallation instructions

  • This package is available on pypi, allowing:
pip install sharpener
  • Alternatively, clone this repository. From terminal type:
git clone
  • Then change directory into SHARPener and install:
cd SHARPener && pip install .

© Filippo M. Maccagni 2018-2019

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