University of Hertfordshire

A Search for Symmetries in the Star Formation Patterns of Spiral Disks: Barred Galaxies

Research output: Chapter in Book/Report/Conference proceedingConference contribution


  • M. Rozas
  • J.E. Beckman
  • J. Knapen
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Original languageEnglish
Title of host publicationIn: Barred galaxies, ASP Conference Series 91
PublisherAstronomical Society of the Pacific
ISBN (Print)1-886733-12-0
Publication statusPublished - 1996


The Ha brightness distribution of a face-on galaxy is a classical representation of the massive star formation rate per unit surface area. Here, we present a test for the degree of symmetry in this distribution, aimed at deciding whether this parameter shows a significant difference between barred and non-barred galaxies. The test consists in deriving the cross-correlation function of the Ha brightness as a function of curvilinear distance along pairs of opposed arms. In order to use the test, we first apply a geometrical unfolding technique. Here we explain this technique, and present the initial results of applying the test to NGC 157 and NGC 6764.


Original paper can be found at: Astronomical Society of the Pacific

ID: 181922