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

Published online by Cambridge University Press:  12 April 2016

M. Rozas ,
J. E. Beckman  and
J. H. Knapen
M. Rozas
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Canarias, Spain
J. E. Beckman
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Canarias, Spain
J. H. Knapen
Affiliation:
Université de Montréal, Dép. de Physique, C.P. 6128, Succ. Centre Ville, Montréal, Québec, H3C 3J7 Canada

Abstract

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The Hα 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 Hα 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.

Type
Posters for Part I and Part II
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 117 - 119
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Knapen, J.H. 1992, PhD thesis, Univ. de La Laguna Google Scholar
Knapen, J.H., Beekman, J.E., Cepa, J., van der Hulst, J.M., & Rand, R.J. 1992, ApJ, 385, L37 Google Scholar
Knapen, J.H., Beekman, J.E., Cepa, J., & Nakai, N. 1995, A&A, submittedGoogle Scholar
Rozas, M., Beekman, J.E., & Knapen, J.H. 1995, A&A, in pressGoogle Scholar