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74 papers · 1 filter
Star Formation in Disks: Spiral Arms, Turbulence, and Triggering Mechanisms
Bruce G. Elmegreen
Star formation is enhanced in spiral arms because of a combination of orbit crowding, cloud collisions, and gravitational instabilities. The characteristic mass for the instability…
Bulge and Clump Evolution in Hubble Ultra Deep Field Clump Clusters, Chains and Spiral Galaxies
Bruce G. Elmegreen, Debra Meloy Elmegreen, Maria Ximena Fernandez +1
Clump clusters and chain galaxies in the Hubble Ultra Deep Field are examined for bulges in the NICMOS images. Approximately 50% of the clump clusters and 30% of the chains have re…
Evolution of the Bar Fraction in COSMOS: Quantifying the Assembly of the Hubble Sequence
Kartik Sheth, Debra Meloy Elmegreen, Bruce G. Elmegreen +13
We have analyzed the redshift-dependent fraction of galactic bars over 0.2<z<0.84 in 2,157 luminous face-on spiral galaxies from the COSMOS 2-square degree field. Our sample is an…
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…
Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
Debra Meloy Elmegreen, Bruce G. Elmegreen, Swara Ravindranath +1
The photometric redshift distributions, spectral types, Sersic indices, and sizes of all resolved galaxies in the Hubble Space Telescope Ultra Deep Field (UDF) are studied in order…
Bars, Spiral Structure, and Secular Evolution in Disk Galaxies
Bruce G. Elmegreen
Simulations and observations of galactic bars suggest they do not commonly evolve into bulges, although it is possible that the earliest bars formed bulges long ago, when galaxies…