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

被引：52

作者：

Yamauchi, C ^{[1
]}

Ichikawa, SI

Doi, M

Yasuda, N

Yagi, M

Fukugita, M

Okamura, S

Nakamura, O

Sekiguchi, M

Goto, T

机构：

[1] Nagoya Univ, Dept Phys & Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[2] Natl Astron Observ, Astron Data Anal Ctr, Tokyo 1818588, Japan

[3] Natl Astron Observ, Div Opt & Infrared Astron, Tokyo 1818588, Japan

[4] Univ Tokyo, Sch Sci, Inst Astron, Tokyo 1810015, Japan

[5] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[6] Univ Tokyo, Sch Sci, Dept Astron, Tokyo 1130033, Japan

[7] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[8] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan

来源：

ASTRONOMICAL JOURNAL | 2005年 / 130卷 / 04期

关键词：

galaxies : fundamental parameters; galaxies : general; galaxies : structure;

D O I：

10.1086/444416

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar or equal to 88% with respect to the reference visual classification. A reasonably high success rate (similar or equal to 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.

引用

页码：1545 / 1557

页数：13

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