Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies |
| |
Authors: | Yinghe Zhao |
| |
Institution: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China 2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, 210008, China
|
| |
Abstract: | In this paper we present the stellar population synthesis results for a sample of 75 bulges in isolated spiral Sb-Sc galaxies,
using the spectroscopic data from the Sloan Digital Sky Survey and the STARLIGHT code. We find that both pseudo-bulges and
classical bulges in our sample are predominantly composed of old stellar populations, with mean mass-weighted stellar age
around 10 Gyr. While the stellar population of pseudo-bulges is, in general, younger than that of classical bulges, the difference
is not significant, which indicates that it is hard to distinguish pseudo-bulges from classical bulges, at least for these
isolated galaxies, only based on their stellar populations. Pseudo-bulges have star formation activities with relatively longer
timescale than classical bulges, indicating that secular evolution is more important in this kind of systems. Our results
also show that pseudo-bulges have a lower stellar velocity dispersion than their classical counterparts, which suggests that
classical bulges are more dispersion-supported than pseudo-bulges. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|