The distribution of star-forming regions in M33

Details The distribution of star-forming regions in M33 The distribution of star-forming regions in M33

2011-09-14

arxiv.org/abs/1109.3104v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages including 2 figures and 1 table. Proceedings of the IX Scientific Meeting of the Spanish Society of Astronomy, held on

Scientific paper

We use fractal analysis to systematically study the clustering strength of the distribution of stars, HII regions, molecular gas, and individual giant molecular clouds in M33 over a wide range of spatial scales. We find a clear transition from a scale-free behavior at small spatial scales to a nearly uniform distribution at large scales. The transition region lies in the range 500-1000 pc and it separates the regime of small-scale turbulent motion from that of large-scale galactic dynamics. The three-dimensional fractal dimension of bright young stars and molecular gas at small spatial scales is similar to or less than 1.9 indicating that the interstellar medium in M33 is on average much more fragmented and irregular than the in the Milky Way.

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