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Gas Phase Processes Affecting Galactic Evolution
Bruce G. Elmegreen
Gas processes affecting star formation are reviewed with an emphasis on gravitational and magnetic instabilities as a source of turbulence. Gravitational instabilities are pervasiv…
Constraints on Star Formation from the Close Packing of Protostars in Clusters
Bruce G. Elmegreen, Mohsen Shadmehri
The mm-wave continuum sources (MCS) in Ophiuchus have mutual collision rates less than their collapse rates by a factor of 10 to 100, suggesting most will form stars without furthe…
Star Formation from Galaxies to Globules
Bruce G. Elmegreen
The empirical laws of star formation suggest that galactic-scale gravity is involved, but they do not identify the actual triggering mechanisms for clusters in the final stages. Ma…
Arm Structure in Anemic Spiral Galaxies
Debra Meloy Elmegreen, Bruce G. Elmegreen, Jay A. Frogel +4
Anemic galaxies have less prominent star formation than normal galaxies of the same Hubble type. Previous studies showed they are deficient in total atomic hydrogen but not in mole…
Environmental Dependencies for Star Formation Triggered by Expanding Shell Collapse
Bruce G. Elmegreen, Jan Palous, Sona Ehlerova
Criteria for gravitational collapse of expanding shells in rotating, shearing galaxy disks were determined using three-dimensional numerical simulations in the thin shell approxima…
The triggered star formation in rotating disks
J. Palous, S. Ehlerova, B. G. Elmegreen
The gravitational instability of expanding shells triggering the formation of clouds and stars is analyzed. Disks with different scale-heights, ambient and shell velocity dispersio…