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A Catalog of HI Clouds in the Large Magellanic Cloud | S. Kim
; E. Rosolowsky
; Y. Lee
; Y. Kim
; Y.C. Jung
; M.A. Dopita
; B.G. Elmegreen
; K.C. Freeman
; R.J. Sault
; M.J. Kesteven
; D. McConnell
; Y.-H. Chu
; | Date: |
11 Jun 2007 | Abstract: | A 21 cm neutral hydrogen interferometric survey of the Large Magellanic Cloud
(LMC) combined with the Parkes multi-beam HI single-dish survey clearly shows
that the HI gas is distributed in the form of clumps or clouds. The HI clouds
and clumps have been identified using a thresholding method with three three
separate brightness temperature thresholds ($T_b$). Each catalog of HI cloud
candidates shows a power law relationship between the sizes and the velocity
dispersions of the clouds roughly following the Larson Law scaling $sigma_v
propto R^{0.5}$, with steeper indices associated with dynamically hot regions.
The clouds in each catalog have roughly constant virial parameters as a
function mass suggesting that that the clouds are all in roughly the same
dynamical state, but the values of the virial parameter are significantly
larger than unity showing that turbulent motions dominate gravity in these
clouds. The mass distribution of the clouds is a power law with differential
indices between -1.6 and -2.0 for the three catalogs. In contrast, the
distribution of mean surface densities is a log-normal distribution. | Source: | arXiv, arxiv.0706.1292 | Services: | Forum | Review | PDF | Favorites |
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