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Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time
Bruce G. Elmegreen, Debra Meloy Elmegreen, Johan H. Knapen +3
K_s-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R_25-normalized radius at this peak. This implies that…
Variations in Stellar Clustering with Environment: Dispersed Star Formation and the Origin of Faint Fuzzies
Bruce G. Elmegreen
The observed increase in star formation efficiency with average cloud density, from several percent in whole giant molecular clouds to ~30 or more in cluster-forming cores, can be…
Rapid formation of exponential disks and bulges at high redshift from the dynamical evolution of clump cluster and chain galaxies
F. Bournaud, B. G. Elmegreen, D. M. Elmegreen
Many galaxies at high redshift have peculiar morphologies dominated by 10^8-10^9 Mo kpc-sized clumps. Using numerical simulations, we show that these "clump clusters" can result fr…
On the Rapid Collapse and Evolution of Molecular Clouds
Bruce G. Elmegreen
Stars generally form faster than the ambipolar diffusion time, suggesting that several processes short circuit the delay and promote a rapid collapse. These processes are considere…
A Catalog of HI Clouds in the Large Magellanic Cloud
S. Kim, E. Rosolowsky, Y. Lee +9
A 21 cm neutral hydrogen interferometric survey of the Large Magellanic Cloud (LMC) combined with the Parkes multi-beam HI single-dish survey clearly shows that the HI gas is distr…
Smooth and Starburst Tidal Tails in the GEMS and GOODS Fields
Debra Meloy Elmegreen, Bruce G. Elmegreen, Thomas Ferguson +1
GEMS and GOODS fields were examined to z~1.4 for galaxy interactions and mergers. The basic morphologies are familiar: antennae with long tidal tails, tidal dwarfs, and merged core…