PMO OpenIR  > 星系中的恒星形成研究团组
ABUNDANCES AND ISOTOPE RATIOS IN THE MAGELLANIC CLOUDS: THE STAR-FORMING ENVIRONMENT OF N 113
Wang, M.1,2; Chin, Y. -N.3; Henkel, C.2; Whiteoak, J. B.4; Cunningham, M.5
2009
Source PublicationASTROPHYSICAL JOURNAL
Volume690Issue:1Pages:580-597
AbstractWith the goal of deriving the physical and chemical conditions of star-forming regions in the Large Magellanic Cloud (LMC), a spectral line survey of the prominent star-forming region N 113 is presented. The observations cover parts of the frequency range from 85 GHz to 357 GHz and include 63 molecular transitions from a total of 16 species, among them are the spectra of rare isotopologues. Maps of selected molecular lines as well as the 1.2 mm continuum distribution are also presented. Molecular abundances in the core of the complex are consistent with a photon-dominated region in a nitrogen deficient environment. While carbon monoxide (CO) shows optical depths of the order of tau similar to 10, (13)CO is optically thin. The most prominent lines of carbon monosulfide (CS), HCN, and HCO(+) show signs of weak saturation (tau similar to 0.5). Densities range from 5 x 10(3) cm(-3) for CO to almost 10(6) for CS, HCN, and a few other species, indicating that only the densest regions provide sufficient shielding, even for some of the most common species. An ortho- to para-formaldehyde (H(2)CO) ratio of similar to 3 hints at H(2)CO formation in a warm (greater than or similar to 40 K) environment. Isotope ratios are (12)C/(13)C similar to 49 +/- 5, (16)O/(18)O similar to 2000 +/- 250, (18)O/(17)O similar to 1.7 +/- 0.2, and (32)S/(34)S similar to 15. Agreement with data from other star-forming clouds shows that the gas is well mixed in the LMC. The isotope ratios not only differ from those seen in the Galaxy, they also do not form a continuation of the trends observed with decreasing metallicity from the inner to the outer Galaxy. This implies that the outer Galaxy, even though showing an intermediate metallicity, is not providing a transition zone between the inner Galaxy and the metal-poor environment of the Magellanic Clouds. A part of this discrepancy is likely caused by differences in the age of the stellar populations in the outer Galaxy and the LMC. While, however, this scenario readily explains measured carbon and oxygen isotope ratios, nitrogen and sulfur still lack a self-consistent interpretation.
KeywordGalaxies: Abundances Galaxies: Individual (Lmc) Magellanic Clouds Radio Continuum: Galaxies Radio Lines: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/690/1/580
WOS KeywordDENSE INTERSTELLAR CLOUDS ; GRAIN SURFACE-CHEMISTRY ; SEST KEY PROGRAM ; MOLECULAR CLOUDS ; NEARBY GALAXIES ; COLLISIONAL EXCITATION ; H2O MASERS ; (CO)-O-18/(CO)-O-17 RATIO ; CHEMICAL EVOLUTION ; FORMALDEHYDE ORTHO
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000262726600048
Citation statistics
Cited Times:43[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15934
Collection星系中的恒星形成研究团组
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Tamkang Univ, Dept Phys, Tamsui 25137, Taipei County, Taiwan
4.CSIRO, Radiophys Labs, Australia Telescope Natl Facil, Epping, NSW 2121, Australia
5.Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
Recommended Citation
GB/T 7714
Wang, M.,Chin, Y. -N.,Henkel, C.,et al. ABUNDANCES AND ISOTOPE RATIOS IN THE MAGELLANIC CLOUDS: THE STAR-FORMING ENVIRONMENT OF N 113[J]. ASTROPHYSICAL JOURNAL,2009,690(1):580-597.
APA Wang, M.,Chin, Y. -N.,Henkel, C.,Whiteoak, J. B.,&Cunningham, M..(2009).ABUNDANCES AND ISOTOPE RATIOS IN THE MAGELLANIC CLOUDS: THE STAR-FORMING ENVIRONMENT OF N 113.ASTROPHYSICAL JOURNAL,690(1),580-597.
MLA Wang, M.,et al."ABUNDANCES AND ISOTOPE RATIOS IN THE MAGELLANIC CLOUDS: THE STAR-FORMING ENVIRONMENT OF N 113".ASTROPHYSICAL JOURNAL 690.1(2009):580-597.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang, M.]'s Articles
[Chin, Y. -N.]'s Articles
[Henkel, C.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, M.]'s Articles
[Chin, Y. -N.]'s Articles
[Henkel, C.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, M.]'s Articles
[Chin, Y. -N.]'s Articles
[Henkel, C.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.