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10 papers · 2 filters
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…
On the Origin of Exponential Disks at High Redshift
Bruce G. Elmegreen, Debra Meloy Elmegreen, David R. Vollbach +2
The major axis and ellipse-fit intensity profiles of spiral galaxies larger than 0.3'' in the Hubble Space Telescope Ultra Deep Field (UDF) are generally exponential, whereas the m…
The Effect of Star Formation History on the Inferred Initial Stellar Mass Function
Bruce G. Elmegreen, John Scalo
Peaks and lulls in the star formation rate (SFR) over the history of the Galaxy produce plateaux and declines in the present day mass function (PDMF) where the main-sequence lifeti…
Radial Profiles of Star Formation in the Far Outer Regions of Galaxy Disks
Bruce G. Elmegreen, Deidre A. Hunter
Star formation in galaxies is triggered by a combination of processes, including gravitational instabilities, spiral wave shocks, stellar compression, and turbulence compression. S…
Broad-Band Imaging of a Large Sample of Irregular Galaxies
Deidre A. Hunter, Bruce G. Elmegreen
We present the results of UBV imaging of a large sample of irregular galaxies: 94 Im systems, 24 Blue Compact Dwarfs (BCDs), and 18 Sm galaxies. We also include JHK imaging of 41 o…
The grazing encounter between IC 2163 and NGC 2207: Pushing the limits of observational modeling
Curtis Struck, Michele Kaufman, Elias Brinks +3
We present numerical hydrodynamical models of the collision between the galaxies IC 2163 and NGC 2207. These models extend the results of earlier work where the galaxy discs were m…