Morphological classification of galaxies and its relation to physical properties

D. B. Wijesinghe*, A. M. Hopkins, B. C. Kelly, N. Welikala, A. J. Connolly

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We extend a recently developed galaxy morphology classification method, Quantitative Multiwavelength Morphology (QMM), to connect galaxy morphologies to their underlying physical properties. The traditional classification of galaxies approaches the problem separately through either morphological classification or, in more recent times, analysis of physical properties. A combined approach has significant potential in producing a consistent and accurate classification scheme as well as shedding light on the origin and evolution of galaxy morphology. Here, we present an analysis of a volume-limited sample of 31 703 galaxies from the fourth data release of the Sloan Digital Sky Survey. We use an image analysis method called Pixel-z to extract the underlying physical properties of the galaxies, which is then quantified using the concentration, asymmetry and clumpiness parameters. The galaxies also have their multiwavelength morphologies quantified using QMM, and these results are then related to the distributed physical properties through a regression analysis. We show that this method can be used to relate the spatial distribution of physical properties with the morphological properties of galaxies.

Original languageEnglish
Pages (from-to)2077-2086
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume404
Issue number4
DOIs
Publication statusPublished - Jun 2010
Externally publishedYes

Keywords

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: general

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