IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF 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

	IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF GALAXIES
	Elmegreen, Bruce G.1; Zhang, Hong-Xin 2,3,4; Hunter, Deidre A.2
刊名	ASTROPHYSICAL JOURNAL
	2012-03-10
卷号	747 期号:2 页码:105(9pp)
关键词	galaxies: bulges galaxies: evolution galaxies: individual (Mrk 178, DDO 155, Haro 29, NGC 2366, NGC 4861) galaxies: irregular galaxies: starburst
ISSN号	0004-637X
英文摘要	Giant star formation clumps in dwarf irregular galaxies can have masses exceeding a few percent of the galaxy mass enclosed inside their orbital radii. They can produce sufficient torques on dark matter halo particles, halo stars, and the surrounding disk to lose their angular momentum and spiral into the central region in 1 Gyr. Pairs of giant clumps with similarly large relative masses can interact and exchange angular momentum to the same degree. The result of this angular momentum loss is a growing central concentration of old stars, gas, and star formation that can produce a long-lived starburst in the inner region, identified with the blue compact dwarf (BCD) phase. This central concentration is proposed to be analogous to the bulge in a young spiral galaxy. Observations of star complexes in five local BCDs confirm the relatively large clump masses that are expected for this process. The observed clumps also seem to contain old field stars, even after background light subtraction, in which case the clumps may be long-lived. The two examples with clumps closest to the center have the largest relative clump masses and the greatest contributions from old stars. An additional indication that the dense central regions of BCDs are like bulges is the high ratio of the inner disk scale height to the scale length, which is comparable to 1 for four of the galaxies.
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]	HUBBLE-SPACE-TELESCOPE ; STAR-FORMING GALAXIES ; DARK-MATTER HALOS ; H-II REGIONS ; SURFACE BRIGHTNESS PROFILES ; DIGITAL SKY SURVEY ; VII ZW 403 ; NEUTRAL HYDROGEN ; SBS 0335-052 ; IRREGULAR GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000302856400021
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8071]
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.IBM Corp, Div Res, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA 2.Lowell Observ, Flagstaff, AZ 86001 USA 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Elmegreen, Bruce G.,Zhang, Hong-Xin,Hunter, Deidre A.. IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF GALAXIES[J]. ASTROPHYSICAL JOURNAL,2012,747(2):105(9pp).
APA	Elmegreen, Bruce G.,Zhang, Hong-Xin,&Hunter, Deidre A..(2012).IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF GALAXIES.ASTROPHYSICAL JOURNAL,747(2),105(9pp).
MLA	Elmegreen, Bruce G.,et al."IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF GALAXIES".ASTROPHYSICAL JOURNAL 747.2(2012):105(9pp).