MOLECULAR AND ATOMIC GAS IN THE LARGE MAGELLANIC CLOUD. II. THREE-DIMENSIONAL CORRELATION BETWEEN CO AND HI

Y. Fukui, A. Kawamura, T. Wong, M. Murai, H. Iritani, N. Mizuno, Y. Mizuno, T. Onishi, A. Hughes, J. Ott, E. Muller, Lister Staveley-Smith, S. Kim

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    Abstract

    We compare the CO (J = 1-0) and H I emission in the Large Magellanic Cloud in three dimensions, i.e., including a velocity axis in addition to the two spatial axes, with the aim of elucidating the physical connection between giant molecular clouds (GMCs) and their surrounding H I gas. The CO J = 1-0 data set is from the second NANTEN CO survey and the H I data set is from the merged Australia Telescope Compact Array (ATCA) and Parkes Telescope surveys. The major findings of our analysis are as follows: (1) GMCs are associated with an envelope of H I emission, (2) in GMCs [average CO intensity] [average H I intensity]1.1±0.1, and (3) the H I intensity tends to increase with the star formation activity within GMCs, from Type I to Type III. An analysis of the H I envelopes associated with GMCs shows that their average line width is 14 km s–1 and the mean density in the envelope is 10 cm–3. We argue that the H I envelopes are gravitationally bound by GMCs. These findings are consistent with a continual increase in the mass of GMCs via H I accretion at an accretion rate of 0.05 M yr–1 over a timescale of 10 Myr. The growth of GMCs is terminated via dissipative ionization and/or stellar-wind disruption in the final stage of GMC evolution.
    Original languageEnglish
    Pages (from-to)144-155
    JournalThe Astrophysical Journal
    Volume705
    Issue number1
    DOIs
    Publication statusPublished - 2009

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    Fukui, Y., Kawamura, A., Wong, T., Murai, M., Iritani, H., Mizuno, N., Mizuno, Y., Onishi, T., Hughes, A., Ott, J., Muller, E., Staveley-Smith, L., & Kim, S. (2009). MOLECULAR AND ATOMIC GAS IN THE LARGE MAGELLANIC CLOUD. II. THREE-DIMENSIONAL CORRELATION BETWEEN CO AND HI. The Astrophysical Journal, 705(1), 144-155. https://doi.org/10.1088/0004-637X/705/1/144