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IN-SPIRALING CLUMPS IN BLUE COMPACT DWARF GALAXIES
Elmegreen, Bruce G.1; Zhang, Hong-Xin2,3,4; Hunter, Deidre A.2
2012-03-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume747Issue:2Pages:105(9pp)
AbstractGiant 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.
KeywordGalaxies: Bulges Galaxies: Evolution Galaxies: Individual (Mrk 178, Ddo 155, Haro 29, Ngc 2366, Ngc 4861) Galaxies: Irregular Galaxies: Starburst
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/747/2/105
WOS KeywordHUBBLE-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
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000302856400021
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8071
Collection星系中的恒星形成研究团组
Affiliation1.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
Recommended Citation
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).
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