TY - JOUR
T1 - Morphological classification of galaxies using photometric parameters
T2 - The concentration index versus the coarseness parameter
AU - Yamauchi, Chisato
AU - Ichikawa, Shin Ichi
AU - Doi, Mamoru
AU - Yasuda, Naoki
AU - Yagi, Masafumi
AU - Fukugita, Masataka
AU - Okamura, Sadanori
AU - Nakamura, Osamu
AU - Sekiguchi, Maki
AU - Goto, Tomotsugu
PY - 2005/10
Y1 - 2005/10
N2 - 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.
AB - 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.
KW - Galaxies: fundamental parameters
KW - Galaxies: general
KW - Galaxies: structure
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U2 - 10.1086/444416
DO - 10.1086/444416
M3 - Article
AN - SCOPUS:27744452964
SN - 0004-6256
VL - 130
SP - 1545
EP - 1557
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
ER -