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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Submillimeter observations of giant molecular clouds in the large magellanic cloud: Temperature and densityas determined from J =3-2 and J=1-0 transitions of CO
Astrophysical Journal, Supplement Series, Volume 175, No. 2, Year 2008
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Description
We have carried out submillimeter 12CO(J = 3-2) observations of six giant molecular clouds (GMCs) in the Large Magellanic Cloud (LMC) with the ASTE 10 m submillimeter telescope at a spatial resolution of 5 pc and very high sensitivity. We have identified 32 molecular clumps in the GMCs and revealed significant details of the warm and dense molecular gas with ra(H2) ∼ 103-105 cm-3 and Tkin ∼ 60 K. These data are combined with 12CO(J = 1-0) and 13CO(J = 1-0) results and compared with LVG calculations, The results indicate that clumps that we detected are distributed continuously from cool (∼10-30 K) to warm (≲30-200 K), and warm clumps are distributed from less dense (∼103 cm-3) to dense (∼1035-10 5 cm-3). We found that the ratio of 12CO(J = 3-2) to 12CO(J = 1-0) emission is sensitive to and is well correlated with the local Ha flux. We infer that differences of clump properties represent an evolutionary sequence of GMCs in terms of density increase leading to star formation. Type I and II GMCs (starless GMCs and GMCs with H II regions only, respectively) are at the young phase of star formation where density does not yet become high enough to show active star formation, and Type III GMCs (GMCs with H II regions and young star clusters) represent the later phase where the average density is increased and the GMCs are forming massive stars. The high kinetic temperature correlated with Ha flux suggests that FUV heating is dominant in the molecular gas of the LMC. © 2008. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Minamidani, Tetsuhiro
Japan, Nagoya
Nagoya University
Japan, Sapporo
Hokkaido University
Mizuno, Norikazu
Japan, Nagoya
Nagoya University
Mizuno, Yoji
Japan, Nagoya
Nagoya University
Kawamura, Akiko
Japan, Nagoya
Nagoya University
Onishi, Toshikazu
Japan, Nagoya
Nagoya University
Hasegawa, Tetsuo
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Tatematsu, Ken'ichi N.Ichi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Ikeda, Masafumi
Japan, Tokyo
Research Center for the Early Universe
Moriguchi, Yoshiaki
Japan, Nagoya
Nagoya University
Yamaguchi, Nobuyuki
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Ott, Jürgen
United States, Charlottesville
National Radio Astronomy Observatory
Wong, Tony
Australia, Sydney
Australia Telescope National Facility
United States, Urbana
University of Illinois Urbana-champaign
Muller, Erik
Australia, Sydney
Australia Telescope National Facility
Pineda, Jorge L.
Germany, Bonn
Universität Bonn
Hughes, Annie
Australia, Sydney
Australia Telescope National Facility
Australia, Hawthorn
Swinburne University of Technology
Staveley-Smith, L.
Australia, Perth
The University of Western Australia
Klein, Ulrich
Germany, Bonn
Universität Bonn
Mizuno, Akira
Japan, Nagoya
Nagoya University
Nikolić, Silvana
Sweden, Onsala
Onsala Space Observatory
Chile, Santiago
Universidad de Chile
Booth, Roy S.
Sweden, Onsala
Onsala Space Observatory
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Heikkilä, Arto
Sweden, Onsala
Onsala Space Observatory
Nyman, Lars Åke
Chile, Santiago
European Southern Observatory Santiago
Lerner, Mikael S.
Chile, Santiago
European Southern Observatory Santiago
Garay, Guido
Chile, Santiago
Universidad de Chile
Kim, Sungeun
South Korea, Seoul
Sejong University
Fujishita, Motosuji
Japan, Nagoya
Nagoya University
Kawase, Tokuichi
Japan, Nagoya
Nagoya University
Rubio, Mónica
Chile, Santiago
Universidad de Chile
Fukui, Yasuo
Japan, Nagoya
Nagoya University
Statistics
Citations: 49
Authors: 29
Affiliations: 15
Identifiers
Doi:
10.1086/524038
ISSN:
00670049
Research Areas
Environmental