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Full-Text Articles in Physical Sciences and Mathematics
Modeling The Effects Of Star Formation Histories On Halpha And Ultra-Violet Fluxes In Nearby Dwarf Galaxies, Daniel R. Weisz, Benjamin D. Johnson, L. Clifton Johnson, Evan D. Skillman, Janice C. Lee, Robert C. Kennicutt Jr., Daniela Calzetti, Liese Van Zee, Matthew S. Bothwell, Julianne J. Dalcanton, Daniel A. Dale, Benjamin F. Williams
Modeling The Effects Of Star Formation Histories On Halpha And Ultra-Violet Fluxes In Nearby Dwarf Galaxies, Daniel R. Weisz, Benjamin D. Johnson, L. Clifton Johnson, Evan D. Skillman, Janice C. Lee, Robert C. Kennicutt Jr., Daniela Calzetti, Liese Van Zee, Matthew S. Bothwell, Julianne J. Dalcanton, Daniel A. Dale, Benjamin F. Williams
Daniela Calzetti
We consider the effects of non-constant star formation histories (SFHs) on Halpha and GALEX far ultra-violet (FUV) star formation rate (SFR) indicators. Under the assumption of a fully populated Chabrier IMF, we compare the distribution of Halpha-to-FUV flux ratios from ~ 1500 simple, periodic model SFHs with observations of 185 galaxies from the Spitzer Local Volume Legacy survey. We find a set of SFH models that are well matched to the data, such that more massive galaxies are best characterized by nearly constant SFHs, while low mass systems experience bursts amplitudes of ~ 30 (i.e., an increase in the SFR …