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Mathematical Morphology: Star/Galaxy Differentiation & Galaxy Morphology Classification

Published online by Cambridge University Press:  05 March 2013

Jason A. Moore ,
Kevin A. Pimbblet  and
Michael J. Drinkwater
Jason A. Moore*
Affiliation:
Department of Physics, University of Queensland, Brisbane QLD 4072, Australia
Kevin A. Pimbblet
Affiliation:
Department of Physics, University of Queensland, Brisbane QLD 4072, Australia
Michael J. Drinkwater
Affiliation:
Department of Physics, University of Queensland, Brisbane QLD 4072, Australia
*
BCorresponding author. E-mail: jmoore@physics.uq.edu.au
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Abstract

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We present an application of Mathematical Morphology (MM) for the classification of astronomical objects, both for star/galaxy differentiation and galaxy morphology classification. We demonstrate that, for CCD images, 99.3 ± 3.8% of galaxies can be separated from stars using MM, with 19.4 ± 7.9% of the stars being misclassified. We demonstrate that, for photographic plate images, the number of galaxies correctly separated from the stars can be increased using our MM diffraction spike tool, which allows 51.0 ± 6.0% of the high-brightness galaxies that are inseparable in current techniques to be correctly classified, with only 1.4 ± 0.5% of the high-brightness stars contaminating the population. We demonstrate that elliptical (E) and late-type spiral (Sc-Sd) galaxies can be classified using MM with an accuracy of 91.4 ± 7.8%. It is a method involving fewer ‘free parameters’ than current techniques, especially automated machine learning algorithms. The limitation of MM galaxy morphology classification based on seeing and distance is also presented. We examine various star/galaxy differentiation and galaxy morphology classification techniques commonly used today, and show that our MM techniques compare very favourably.

Keywords

techniques: image processingmethods: data analysismethods: miscellaneous
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 23 , Issue 4 , 2006 , pp. 135 - 146
Copyright
Copyright © Astronomical Society of Australia 2006

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