Parametric recovery of line-of-sight velocity distributions from absorption-line spectra of galaxies via penalized likelihood

被引:1817
作者
Cappellari, M
Emsellem, E
机构
[1] Leiden Observ, NL-2300 RA Leiden, Netherlands
[2] Ctr Rech Astron Lyon, F-69230 St Genis Laval, France
关键词
D O I
10.1086/381875
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the accuracy of the parametric recovery of the line-of-sight velocity distribution (LOSVD) of the stars in a galaxy while working in pixel space. Problems appear when the data have a low signal-to-noise ratio or the observed LOSVD is not well sampled by the data. We propose a simple solution based on maximum penalized likelihood, and we apply it to the common situation in which the LOSVD is described by a Gauss-Hermite series. We compare different techniques by extracting the stellar kinematics from observations of the barred lenticular galaxy NGC 3384 obtained with the SAURON integral-field spectrograph.
引用
收藏
页码:138 / 147
页数:10
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