2-DIMENSIONAL DECOMPOSITION OF BULGE AND DISK

被引:88
作者
BYUN, YI [1 ]
FREEMAN, KC [1 ]
机构
[1] AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WESTON,ACT 2611,AUSTRALIA
关键词
GALAXIES; PHOTOMETRY; STRUCTURE; METHODS; NUMERICAL;
D O I
10.1086/175986
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe a method of bulge-to-disk decomposition which utilizes a full two-dimensional image of a galaxy. It provides much better estimates of the structural parameters for each component than the widely used conventional procedure which involves a chi(2) decomposition on elliptically averaged profiles. The performances of the conventional one-dimensional method and the present two-dimensional technique are compared by using a set of realistic model galaxy images. We show that the conventional one-dimensional decomposition procedure is subject to strong systematic errors associated with the derivation of the elliptically averaged radial surface brightness profiles; these errors come from the different intrinsic shapes of disk and bulge, combined with the effects of viewing inclination. The present two-dimensional approach successfully recovers the intrinsic parameters for a wide range of B/D ratios at all inclinations.
引用
收藏
页码:563 / 574
页数:12
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