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Two Stellar Mass Functions Combined into One by the Random Sampling Model of the IMF
Bruce Elmegreen
The turnover in the stellar initial mass function (IMF) at low mass suggests the presence of two independent mass functions that combine in different ways above and below a charact…
Star Formation in a Crossing Time
Bruce G. Elmegreen
Observations suggest that star formation occurs in only one or two crossing times for a range of scales spanning a factor of 1000. These observations include (1) measurements of em…
The Specific Frequency of Globular Clusters in Galaxies
Bruce G. Elmegreen
Variations in the number of globular clusters per unit galaxy luminosity, which is the specific frequency, and the mass of globular clusters per unit total available mass, are revi…
Formation and loss of hierarchical structure in two-dimensional MHD simulations of wave-driven turbulence in interstellar clouds
Bruce G. Elmegreen
Two dimensional compressible magneto-hydrodynamical (MHD) simulations run for 20 crossing times on a 800x640 grid with two stable thermal states show persistent hierarchical densit…
A Prediction of Brown Dwarfs in Ultracold Molecular Gas
Bruce G. Elmegreen
A recent model for the stellar initial mass function (IMF), in which the stellar masses are randomly sampled down to the thermal Jeans mass from hierarchically structured pre-stell…
The IMF and its Evolution
Bruce G. Elmegreen
Observations of the stellar initial mass function are reviewed. The flattening at low mass is evidence for a characteristic mass in star formation, which could be the minimum stell…
Phases and Structures of Interstellar Gas
B. Elmegreen
The thermal and chemical phases of the cool component of interstellar gas are discussed. Variations with galactocentric radius and from galaxy to galaxy are mostly the result of ch…
Curvature and Acoustic Instabilities in Rotating Fluid Disks
L. E. Montenegro, C. Yuan, B. G. Elmegreen
The stability of a rotating fluid disk to the formation of spiral arms is studied in the tightwinding approximation in the linear regime. The dispersion relation for spirals that w…
Observations and Theory of Star Cluster Formation
B. G. Elmegreen, Y. N. Efremov, R. E. Pudritz +1
Young stars form on a wide range of scales, producing aggregates and clusters with various degrees of gravitational self-binding. The loose aggregates have a hierarchical structure…
Galactic bulge formation as a maximum intensity starburst
B. G. Elmegreen
Properties of normal galactic star formation, including the density dependence, threshold density, turbulent scaling relations, and clustering properties, are applied to the format…