Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733103b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #331.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Giant Molecular Clouds (GMCs) are believed to be the exclusive sites of star formation. An important step in understanding star formation in GMCs is to study multiple galactic environments. GMCs have been studied extensively in the Milky Way, and clear relationships have been observed between fundamental GMC properties such as size, luminosity, and velocity dispersion. Deriving the same properties from a different galaxy allows us to measure any possible variation in star-formation due to galactic environment differences. Here, we derive these properties for GMCs within the nearby galaxy NGC 2403, allowing us to measure any possible variation in star formation due to differences in galactic environment. NGC 2403 is one of the closest galaxies not located within the Local Group, allowing a detailed view of a distinct environment and the ability to resolve individual GMCs. We study 12COJ=1-0 emission in five star-forming regions to derive the aforementioned GMC properties, and we compare the results to those of GMCs in the Milky Way and other galaxies. In the same regions, we look for correlations of GMC properties with dust abundance and radiation field. Despite a range of dust abundances, we find that the physical properties of GMCs in NGC 2403 do not vary significantly from the fundamental relationships determined for GMCs in the Milky Way. This project was funded by the National Radio Astronomy Observatory and the National Science Foundation.
Bemis Ashley
Friesen Rachel
Leroy Adam
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