Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 星系中的恒星形成研究团组

	Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies
	Zhao, Yinghe1,2
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2012-02-01
卷号	337 期号:2 页码:719-728
关键词	Galaxies Spiral-galaxies Evolution-galaxies Stellar content-galaxies Bulges
ISSN号	0004-640X
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL SKY SURVEY ; DYNAMICALLY HOT GALAXIES ; STAR-FORMING GALAXIES ; SEMIEMPIRICAL ANALYSIS ; STRUCTURAL-PROPERTIES ; METALLICITY RELATION ; ELLIPTICAL GALAXIES ; AMIGA PROJECT ; DATA RELEASE ; EVOLUTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000299849400024
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8074]
专题	紫金山天文台_星系中的恒星形成研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yinghe. Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies[J]. ASTROPHYSICS AND SPACE SCIENCE,2012,337(2):719-728.
APA	Zhao, Yinghe.(2012).Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies.ASTROPHYSICS AND SPACE SCIENCE,337(2),719-728.
MLA	Zhao, Yinghe."Stellar populations of classical and pseudo-bulges for a sample of isolated spiral galaxies".ASTROPHYSICS AND SPACE SCIENCE 337.2(2012):719-728.