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The molecular ridge close to 30 Doradus in the Large Magellanic Cloud

文献类型：期刊论文

作者Ott, Juergen1,2; Wong, Tony3; Pineda, Jorge L.4; Hughes, Annie5,6; Muller, Erik; Li, Zhi-Yun7; Wang, Min8; Staveley-Smith, Lister9; Fukui, Yasuo10; Weiss, Axel11
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
出版日期2008
卷号25期号:3页码:129-137
关键词ISM : evolution ISM : molecules galaxies : ISM galaxies : individual (Large magellanic cloud) radio lines : ISM galaxies : magellanic clouds
ISSN号1323-3580
英文摘要With the ATNF Mopra telescope we are performing a survey in the (CO)-C-12(1-0) line to map the molecular gas in the Large Magellanic Cloud. For some regions we also obtained interferometric maps of the high density gas tracers HCO+ and HCN with the Australia Telescope Compact Array. Here we discuss the properties of the elongated molecular complex that stretches about 2 kpc southward from 30 Doradus. Our data suggest that the complex, which we refer to as the 'molecular ridge', is not a coherent feature but consists of many smaller clumps that share the same formation history. Likely triggers of molecular-cloud formation are shocks and shearing forces that are present in the surrounding south-eastern HI overdensity region, a region influenced by strong ram pressure and tidal forces. The molecular ridge is at the western edge of the the overdensity region where a bifurcated velocity structure transitions into a single disk velocity component. We find that the (CO)-C-12(1-0) and HIemission peaks in the molecular ridge are typically near each other but never coincide. A likely explanation is the conversion of warmer, low-opacity HI to colder, high-opacity HI from which H-2 subsequently forms. On smaller scales we find that very dense molecular gas, as traced by interferometric HCO+ and HCN maps, is associated with star formation along shocked filaments and with rims of expanding shell-like structures, both created by feedback from massive stars.
WOS标题词Science & Technology ; Physical Sciences
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]SUPERGIANT SHELL LMC-4 ; SEST KEY PROGRAM ; CO SURVEY ; IRREGULAR GALAXIES ; CLUSTER FORMATION ; STAR-FORMATION ; H I ; GAS ; STREAM ; SIMULATIONS
收录类别SCI
语种英语
WOS记录号WOS:000259543500004
公开日期2011-12-29
源URL[http://159.226.72.40/handle/332002/1847]  
专题紫金山天文台_分子云与恒星形成研究团组
作者单位1.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
2.CALTECH, Pasadena, CA 91125 USA
3.Univ Illinois, Dept Astron, Urbana, IL 61801 USA
4.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany
5.Swinburne Univ Technol, Ctr Supercomp & Astrophys, Hawthorn, Vic 3122, Australia
6.CSIRO Australia Telescope Natl Facil, Marsfield, NSW 2122, Australia
7.Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
8.CAS, Purple Mt Observ, Nanjing 210008, Peoples R China
9.Univ Western Australia, Sch Phys M013, Crawley, WA 6009, Australia
10.Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan
推荐引用方式
GB/T 7714		 Ott, Juergen,Wong, Tony,Pineda, Jorge L.,et al. The molecular ridge close to 30 Doradus in the Large Magellanic Cloud[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA,2008,25(3):129-137.
APA Ott, Juergen.,Wong, Tony.,Pineda, Jorge L..,Hughes, Annie.,Muller, Erik.,...&Klein, Ulrich.(2008).The molecular ridge close to 30 Doradus in the Large Magellanic Cloud.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA,25(3),129-137.
MLA Ott, Juergen,et al."The molecular ridge close to 30 Doradus in the Large Magellanic Cloud".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA 25.3(2008):129-137.

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