Gathering galaxy properties using HyperLEDA

Created: 2011-11-30 16:49:48      Last updated: 2013-03-08 08:07:14

The user provides an ASCII text file with a list of galaxy names, and the workflow queries the HyperLEDA database and parses the response with the help of regular expressions included in simple Python scripts. The result of the workflow is a series of ASCII text files with the values of the equatorial coordinates in J2000 epoch, the velocities in km/s, the dust extinction coefficient Ag, the axis ratio of the isophote 25 mag/arcsec2 logr25 and the apparent total B magnitude BT. The performance could be improved since only one query per galaxy is needed for the extraction of five physical properties. Nevertheless, we have decided to split the query into five different queries and provide a more modular workflow, which is best suited for aims of re-usability and re-purposability. It may happen that for other physical properties, values may come from different databases.

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