Orbital structure and mass distribution in elliptical galaxies

被引:213
作者
Kronawitter, A
Saglia, RP
Gerhard, O
Bender, R
机构
[1] Univ Basel, Astron Inst, CH-4102 Binningen, Switzerland
[2] Inst Astron & Astrophys, D-81679 Munich, Germany
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 2000年 / 144卷 / 01期
关键词
galaxies : elliptical and lenticular; CD; galaxies : fundamental parameters; kinematics and dynamics; photometry; structure;
D O I
10.1051/aas:2000199
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report. on a homogeneous dynamical analysis of a sample of 21 round (17 E0/E1, 4 E2) elliptical galaxies. We present new kinematic data for eight of these galaxies and new photometry for one object. The remaining kinematic and photometric data and the required distance information are taken from the literature. The analysis uses non-parametric spherical models and takes into account line profile information as well as velocity dispersions. We present model fits to the kinematic data and the derived radial profiles of orbital anisotropy and B-band mass-to-light ratio, including confidence intervals. The circular velocity curves resulting from our model fits are all consistent with being flat outside R approximate to 0.3 R-e. Generally, the M/L ratio profiles show an outward increase, although models based on luminous matter are ruled out at 95% confidence only for three galaxies (NGC 2434, NGC 7507, NGC 7626). For NGC 1399, NGC 4472, NGC 4486, and NGC 4636, where X-ray observations are available, the mass profiles of the best fit models match the ones derived from the X-ray analysis. The best models for most galaxies are isotropic to slightly radially anisotropic, with typical beta less than or similar to 0.3, in a few cases beta less than or similar to 0.5 at R-e/2. We discuss the generally small effects of flattening along the line-of-sight (the expected < c/a > = 0.79 for this sample of luminous ellipticals) and of small embedded disks. Our results suggest that elliptical galaxies have surprisingly uniform dynamical properties.
引用
收藏
页码:53 / 84
页数:32
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