Structural Properties of Early-Type Galaxies from the SDSS DR2

• Published in: Chinese journal of astronomy and astrophysics 2008-10, Vol.8 (5), p.503-521
• Main Authors: Liu, Feng-Shan, Deng, Zu-Gan, Wu, Hong, Xia, Xiao-Yang
• Format: Article
• Language: English
• Subjects: cD星系; 光学测试星系; 星系结构; 椭圆星系
• ISSN: 1009-9271
• DOI: 10.1088/1009-9271/8/5/02

Two-dimensional bulge/disk light decomposition with GIM2D in both the r- and g-bands has been applied to a sample of 129 early-type galaxies brighter than 13.5 magnitude in the r-band, selected from the Sloan Digital Sky Survey Data Release 2. Intensity-weighted Fourier coefficient （α4/α） was also derived for each sample galaxy. Our analysis shows that there are correlations between bulge-to-total light ratio （B/T） with bulge Sersic index nB and between bulge and disk scale sizes. Isophotal shape parameter （α4/α） is not correlated with BIT and riB. Both bulge and disk components satisfy a color-magnitude relation. The space Fundamental Plane analysis shows that galaxies with larger B/T tend to lie tighter and closer to the line of k1 ＋ k2 = 8 （the so-called ＂zone of avoidance＂） than the galaxies with smaller B/T. It indicates that existence of the disk component may lead to scatter of the distribution on the Fundamental Plane. Our analysis also shows that k1 ＋ k2 correlates with （g-r） color and B/T, but does not correlate with （α4/α） for early-type galaxies. The fitted parameters and other retrieved parameters used in this paper for all sample galaxies are available online.