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The Smallest AGN Host Galaxies
J. E. Greene, A. J. Barth, L. C. Ho
We describe our efforts to study dwarf galaxies with active nuclei, whose black holes, with masses < 10^6 M_sun, provide the best current observational constraints on the mass dist…
Is the Broad-Line Region Clumped or Smooth? Constraints from the H alpha Profile in NGC 4395, the Least Luminous Seyfert 1 Galaxy
Ari Laor, Aaron J. Barth, Luis C. Ho +1
The origin and configuration of the gas which emits broad lines in Type I active galactic nuclei is not established yet. The lack of small-scale structure in the broad emission-lin…
Mass distribution of spiral galaxies from characteristics of spiral structure: Constraints on galaxy formation models
Marc S. Seigar, Aaron J. Barth, James Bullock +1
Recently, it has been shown that a correlation exists between the rate of shear and the spiral arm pitch angle in disk galaxies. The rate of shear depends upon the shape of the rot…
Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b
J. S. Bloom, J. X. Prochaska, D. Pooley +25
The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB…