Topology Of HI In SMC: Genus Statistics

Details Topology Of HI In SMC: Genus Statistics Topology Of HI In SMC: Genus Statistics

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113804g&link_type=abstract

American Astronomical Society, AAS Meeting #211, #138.04; Bulletin of the American Astronomical Society, Vol. 39, p.984

Statistics

Scientific paper

The genus statistic is a powerful tool used to study the topology of the universe, from high redshift galaxies to the CMB. In this work, genus statistics have been applied to an HI column density map of the Small Magellanic Cloud in order to study its topology. At the smallest scales studied (26 pc - 75 pc) the genus shift is negative, implying a clump topology. At medium scales(75 pc - 125 pc) the topology shifts to a neutral/slightly positive value, indicating a tendency towards a swiss-cheese/hole topology. At large scales (>125; pc) the genus shift varies from region to region but overall tends to return to a slight negative value, consistent with a minor clump topology at the largest scales explored. Other regions with varying areas still show this slight clump topology at low smoothing radii and trend towards a zero shift at higher smoothing radii. Only two of the 62 regions show a significant positive shift, indicating that a hole topology at small scales within the SMC is rare.
This work was supported by the REU and ASSURE programs through NSF award AST-0453442.

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