PREDICTING LINE-OF-SIGHT VELOCITY DISTRIBUTIONS OF ELLIPTIC GALAXIES

被引:34
作者
MAGORRIAN, J
BINNEY, J
机构
[1] Theoretical Physics, Keble Road, Oxford
关键词
CELESTIAL MECHANICS; STELLAR DYNAMICS; GALAXIES; ELLIPTIC AND LENTICULAR; CD; KINEMATICS AND DYNAMICS;
D O I
10.1093/mnras/271.4.949
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We extend the galaxy modelling technique of Binney, Davies and Illingworth to the calculation of the predicted line-of-sight velocity distribution (LOSVD) at each point on the sky. Following Gerhard and van der Marel and Franx we characterize the LOSVD by the coefficients h(j) in its optimized Gauss-Hermite expansion. We prove some results concerning this expansion and test our technique on pseudo-data. We find that LOSVDs, under the assumption of velocity dispersion isotropy, can be accurately predicted out to two effective radii provided that the galaxy has inclination angle i greater than or similar to 70 degrees.
引用
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页码:949 / 957
页数:9
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