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Star-Forming Complexes in Galaxies
Bruce G. Elmegreen
Star complexes are the largest globular regions of star formation in galaxies. If there is a spiral density wave, nuclear ring, tidal arm, or other well-defined stellar structure,…
The IMF in Starbursts
Bruce G. Elmegreen
The history of the IMF in starburst regions is reviewed. The IMFs are no longer believed to be top-heavy, although some superstar clusters, whether in starburst regions or not, cou…
Cluster Density and the IMF
Bruce G. Elmegreen
Observed variations in the IMF are reviewed with an emphasis on environmental density. The remote field IMF studied in the LMC by several authors is clearly steeper than most clust…
Variability in the stellar initial mass function at low and high mass: 3-component IMF models
Bruce G. Elmegreen
Three component models of the IMF are made to consider possible origins for the observed relative variations in the numbers of brown dwarfs, solar-to-intermediate mass stars, and h…
Star Formation Properties of a Large Sample of Irregular Galaxies
Deidre A. Hunter, Bruce G. Elmegreen
We present the results of Halpha imaging of 94 irregular galaxies, including types Im, BCD, and Sm. The sample spans a large range in galactic parameters including integrated absol…
Turbulence and galactic structure
Bruce G. Elmegreen
Interstellar turbulence is driven over a wide range of scales by processes including spiral arm instabilities and supernovae, and it affects the rate and morphology of star formati…