Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-01-29
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication by MNRAS. 11 pages, 16 figures
Scientific paper
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, through 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 31703 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 (CAS) 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.
Connolly Andrew J.
Hopkins Andrew M.
Kelly Brandon C.
Welikala Niraj
Wijesinghe Dinuka B.
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