Morphological classification of galaxies using photometric parameters: The concentration index versus the coarseness parameter

Chisato Yamauchi, Shin Ichi Ichikawa, Mamoru Doi, Naoki Yasuda, Masafumi Yagi, Masataka Fukugita, Sadanori Okamura, Osamu Nakamura, Maki Sekiguchi, Tomotsugu Goto

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We devise improved photometric parameters for the morphological classification of galaxies using a bright sample from the First Data Release of the Sloan Digital Sky Survey. In addition to using an elliptical aperture concentration index for classification, we introduce a new texture parameter, coarseness, which quantifies deviations from smooth galaxy isophotes. The elliptical aperture concentration index produces morphological classifications that are in appreciably better agreement with visual classifications than those based on circular apertures. With the addition of the coarseness parameter, the success rate of classifying galaxies into early and late types increases to ≃88% with respect to the reference visual classification. A reasonably high success rate (≃68%) is also attained in classifying galaxies into three types, early-type galaxies (E+S0) and early-type (Sa+Sb) and late-type (Sc+Sdm+Im) spiral galaxies.

Original languageEnglish
Pages (from-to)1545-1557
Number of pages13
JournalAstronomical Journal
Volume130
Issue number4
DOIs
Publication statusPublished - 2005 Oct 1

Keywords

  • Galaxies: fundamental parameters
  • Galaxies: general
  • Galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Yamauchi, C., Ichikawa, S. I., Doi, M., Yasuda, N., Yagi, M., Fukugita, M., Okamura, S., Nakamura, O., Sekiguchi, M., & Goto, T. (2005). Morphological classification of galaxies using photometric parameters: The concentration index versus the coarseness parameter. Astronomical Journal, 130(4), 1545-1557. https://doi.org/10.1086/444416