Tidal dwarf galaxies at intermediate redshifts

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

	Tidal dwarf galaxies at intermediate redshifts
	Wen, Zhang-Zheng 1,2; Zheng, Xian-Zhong1 ; Zhao, Ying-He1 ; Gao, Yu1
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2012-02-01
卷号	337 期号:2 页码:729-737
关键词	Galaxies: dwarf galaxies Galaxies: evolution
ISSN号	0004-640X
英文摘要	We present the first attempt at measuring the production rate of tidal dwarf galaxies (TDGs) and estimating their contribution to the overall dwarf population. Using HST/ACS deep imaging data from GOODS and GEMS surveys in conjunction with photometric redshifts from COMBO-17 survey, we performed a morphological analysis for a sample of merging/interacting galaxies in the Extended Chandra Deep Field South and identified tidal dwarf candidates in the rest-frame optical bands. We estimated a production rate about 1.4 x 10(-5) per Gyr per comoving volume for long-lived TDGs with stellar mass 3x10(8-9) M-circle dot at 0.5 < z < 1.1. Together with galaxy merger rates and TDG survival rate from the literature, our results suggest that only a marginal fraction (less than 10%) of dwarf galaxies in the local universe could be tidally-originated. TDGs in our sample are on average bluer than their host galaxies in the optical. Stellar population modelling of optical to near-infrared spectral energy distributions (SEDs) for two TDGs favors a burst component with age 400/200 Myr and stellar mass 40%/26% of the total, indicating that a young stellar population newly formed in TDGs. This is consistent with the episodic star formation histories found for nearby TDGs.
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]	ULTRA DEEP FIELD ; STAR-FORMATION HISTORIES ; COMPACT-GROUPS ; FORMING GALAXIES ; INTERACTING GALAXIES ; DYNAMICAL EVOLUTION ; LUMINOSITY FUNCTION ; INFRARED PROPERTIES ; IRREGULAR GALAXIES ; MASSIVE GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000299849400025
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8075]
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, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wen, Zhang-Zheng,Zheng, Xian-Zhong,Zhao, Ying-He,et al. Tidal dwarf galaxies at intermediate redshifts[J]. ASTROPHYSICS AND SPACE SCIENCE,2012,337(2):729-737.
APA	Wen, Zhang-Zheng,Zheng, Xian-Zhong,Zhao, Ying-He,&Gao, Yu.(2012).Tidal dwarf galaxies at intermediate redshifts.ASTROPHYSICS AND SPACE SCIENCE,337(2),729-737.
MLA	Wen, Zhang-Zheng,et al."Tidal dwarf galaxies at intermediate redshifts".ASTROPHYSICS AND SPACE SCIENCE 337.2(2012):729-737.