Young stellar nuclei in the lenticular galaxies. I. NGC 1023 and NGC 7332

被引：27
|
作者：
Sil'chenko, OK [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia
[2] Isaac Newton Inst Chile, Moscow Branch, Moscow, Russia
来源：
ASTRONOMICAL JOURNAL | 1999年 / 117卷 / 06期
关键词：
galaxies : nuclei; galaxies; individual; (NGC; 1023; NGC; 7332); galaxies : evolution; galaxies : structure;
D O I：
10.1086/300876
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
As a result of bidimensional spectroscopy of the central parts of two nearby lenticular galaxies, NGC 1023 and NGC 7332, undertaken with the Multi-Pupil Field Spectrograph of the 6 m telescope of the Special Astrophysical Observatory, their chemically decoupled stellar nuclei are found to be substantially younger than the surrounding bulges: the mean age of the nuclear stellar populations is 7 Gyr in NGC 1023 and 2.5 +/- 0.5 Gyr in NGC 7332. The morphological analysis undertaken by Seifert & Scorza for NGC 7332 and by us for NGC 1023 has revealed a existence of separate circumnuclear stellar disks with the radius of 80 pc in NGC 1023 and of 400 pc in NGC 7332; probably, the intermediate-age stellar populations are related to these structures.
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页码：2725 / 2735
页数：11
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