The Second Survey of the Molecular Clouds in the Large Magellanic Cloud by NANTEN I: Catalog of Molecular Clouds - AstrophysicsReportar como inadecuado




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Abstract: The second survey of the molecular clouds in 12CO J = 1-0 was carried outin the Large Magellanic Cloud by NANTEN. The sensitivity of this survey istwice as high as that of the previous NANTEN survey, leading to a detection ofmolecular clouds with M CO > 2 x 10^4 M sun. We identified 272 molecularclouds, 230 of which are detected at three or more observed positions. Wederived the physical properties, such as size, line width, virial mass, of the164 GMCs which have an extent more than the beam size of NANTEN in both themajor and minor axes. The CO luminosity and virial mass of the clouds show agood correlation of M VIR propto L CO^{1.1 +- 0.1} with a Spearman rankcorrelation of 0.8 suggesting that the clouds are in nearly virial equilibrium.Assuming the clouds are in virial equilibrium, we derived an X CO-factor to be~ 7 x 10^20 cm^-2 K km s^-1^-1. The mass spectrum of the clouds is fittedwell by a power law of N cloud>M CO proportional to M CO^{-0.75 +- 0.06}above the completeness limit of 5 x 10^4 M sun. The slope of the mass spectrumbecomes steeper if we fit only the massive clouds; e.g., N cloud >M CO isproportional to M CO^{-1.2 +- 0.2} for M CO > 3 x 10^5 M sun.



Autor: Yasuo Fukui 1, Akiko Kawamura 1, Tetsuhiro Minamidani 1 and 2, Yoji Mizuno 1, Yoko Kanai 1, Norikazu Mizuno 1, Toshikazu Onishi 1

Fuente: https://arxiv.org/







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