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Dynamical Versus Stellar Masses in Compact Early-Type Galaxies: Further Evidence for Systematic Variation in the Stellar Initial Mass Function
Charlie Conroy, Aaron A. Dutton, Genevieve J. Graves +2
Several independent lines of evidence suggest that the stellar initial mass function (IMF) in early-type galaxies becomes increasingly `bottom-heavy' with increasing galaxy mass an…
Galaxy pairs in the Sloan Digital Sky Survey - VI. The orbital extent of enhanced star formation in interacting galaxies
David R. Patton, Paul Torrey, Sara L. Ellison +2
We use pair and environmental classifications of ~ 211,000 star-forming galaxies from the Sloan Digital Sky Survey, along with a suite of merger simulations, to investigate the enh…
Galaxy pairs in the Sloan digital sky survey - VII: The merger -- luminous infra-red galaxy connection
Sara L. Ellison, J. Trevor Mendel, Jillian M. Scudder +2
We use a sample of 9397 low z galaxies with a close companion to investigate the connection between mergers and luminous infra-red (IR) galaxies (LIRGs). The pairs are selected fro…
A fundamental problem in our understanding of low mass galaxy evolution
Simone M. Weinmann, Anna Pasquali, Benjamin D. Oppenheimer +4
Recent studies have found a dramatic difference between the observed number density evolution of low mass galaxies and that predicted by semi-analytic models. While models accurate…
Universal IMF vs dark halo response in early-type galaxies: breaking the degeneracy with the fundamental plane
Aaron A. Dutton, Andrea V. Maccio', J. Trevor Mendel +1
We use the relations between aperture stellar velocity dispersion (σ_ap), stellar mass (M_sps), and galaxy size (R_e) for a sample of \sim 150,000 early-type galaxies from SDSS/DR7…
Evidence for a non-universal stellar initial mass function in low-redshift high-density early-type galaxies
Aaron A. Dutton, J. Trevor Mendel, Luc Simard
We determine an absolute calibration of stellar mass-to-light ratios for the densest \simeq 3% of early-type galaxies in the local universe (redshift z\simeq 0.08) from SDSS DR7. T…