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CLOUD STRUCTURE OF GALACTIC OB CLUSTER-FORMING REGIONS FROM COMBINING GROUND- AND SPACE-BASED BOLOMETRIC OBSERVATIONS
Lin, Yuxin1; Liu, Hauyu Baobab2; Li, Di1,3; Zhang, Zhi-Yu2,4; Ginsburg, Adam2; Pineda, Jaime E.5; Qian, Lei1; Galvan-Madrid, Roberto6; McLeod, Anna Faye2; Rosolowsky, Erik7; Dale, James E.8,9; Immer, Katharina2; Koch, Eric7; Longmore, Steve10; Walker, Daniel10; Testi, Leonardo2
2016-09-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume828Issue:1
AbstractWe have developed an iterative procedure to systematically combine the millimeter and submillimeter images of OB cluster-forming molecular clouds, which were taken by ground-based (CSO, JCMT, APEX, and IRAM-30 m) and space telescopes (Herschel and Planck). For the seven luminous (L > 10(6) L-circle dot) Galactic OB cluster-forming molecular clouds selected for our analyses, namely W49A, W43-Main, W43-South, W33, G10.6-0.4, G10.2-0.3, and G10.3-0.1, we have performed single-component, modified blackbody fits to each pixel of the combined (sub) millimeter images, and the Herschel PACS and SPIRE images at shorter wavelengths. The similar to 10 '' resolution dust column density and temperature maps of these sources revealed dramatically different morphologies, indicating very different modes of OB cluster-formation, or parent molecular cloud structures in different evolutionary stages. The molecular clouds W49A, W33, and G10.6-0.4 show centrally concentrated massive molecular clumps that are connected with approximately radially orientated molecular gas filaments. The W43-Main and W43-South molecular cloud complexes, which are located at the intersection of the Galactic near 3 kpc (or Scutum) arm and the Galactic bar, show a widely scattered distribution of dense molecular clumps/cores over the observed similar to 10 pc spatial scale. The relatively evolved sources G10.2-0.3 and G10.3-0.1 appear to be affected by stellar feedback, and show a complicated cloud morphology embedded with abundant dense molecular clumps/cores. We find that with the high angular resolution we achieved, our visual classification of cloud morphology can be linked to the systematically derived statistical quantities (i.e., the enclosed mass profile, the column density probability distribution function (N-PDF), the two-point correlation function of column density, and the probability distribution function of clump/core separations). In particular, the massive molecular gas clumps located at the center of G10.6-0.4 and W49A, which contribute to a considerable fraction of their overall cloud masses, may be special OB cluster-forming environments as a direct consequence of global cloud collapse. These centralized massive molecular gas clumps also uniquely occupy much higher column densities than what is determined by the overall fit of power-law N-PDF. We have made efforts to archive the derived statistical quantities of individual target sources, to permit comparisons with theoretical frameworks, numerical simulations, and other observations in the future.
KeywordIsm: Structure Methods: Statistical Stars: Formation Submillimeter: Ism Techniques: Image Processing
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/0004-637X/828/1/32
WOS KeywordMASSIVE STAR-FORMATION ; GIANT MOLECULAR CLOUD ; H II REGIONS ; PROBABILITY-DISTRIBUTION FUNCTIONS ; YOUNG STELLAR OBJECTS ; IN-FLIGHT PERFORMANCE ; INTERSTELLAR-MEDIUM ; TRIGONOMETRIC PARALLAXES ; CONTINUUM OBSERVATIONS ; FORMATION EFFICIENCY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000386894900032
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23598
Collection中国科学院紫金山天文台
Corresponding AuthorLin, Yuxin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100864, Peoples R China
2.ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany
3.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China
4.Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
5.Max Planck Inst Extraterr Phys, Giessenbach Str 1, D-85748 Garching, Germany
6.UNAM, Inst Radioastron & Astrofis, Apdo Postal 3-72, Morelia 58089, Michoacan, Mexico
7.Univ Alberta, Dept Phys, 4-181 CCIS, Edmonton, AB T6G 2E1, Canada
8.Univ Sternwarte, Scheinerstr 1, D-81679 Munich, Germany
9.Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany
10.Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
Recommended Citation
GB/T 7714
Lin, Yuxin,Liu, Hauyu Baobab,Li, Di,et al. CLOUD STRUCTURE OF GALACTIC OB CLUSTER-FORMING REGIONS FROM COMBINING GROUND- AND SPACE-BASED BOLOMETRIC OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2016,828(1).
APA Lin, Yuxin.,Liu, Hauyu Baobab.,Li, Di.,Zhang, Zhi-Yu.,Ginsburg, Adam.,...&Testi, Leonardo.(2016).CLOUD STRUCTURE OF GALACTIC OB CLUSTER-FORMING REGIONS FROM COMBINING GROUND- AND SPACE-BASED BOLOMETRIC OBSERVATIONS.ASTROPHYSICAL JOURNAL,828(1).
MLA Lin, Yuxin,et al."CLOUD STRUCTURE OF GALACTIC OB CLUSTER-FORMING REGIONS FROM COMBINING GROUND- AND SPACE-BASED BOLOMETRIC OBSERVATIONS".ASTROPHYSICAL JOURNAL 828.1(2016).
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