A Comparison of H-alpha and UV Star Formation Rates in the Local Volume: Systematic Discrepancies in Dwarf Galaxies

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Using a complete, statistical sample of star-forming galaxies within the Local Volume, we evaluate the consistency between star formation rates (SFRs) inferred from H-alpha nebular emission and the far ultraviolet non-ionizing continuum. Our analysis probes activities ranging from those that characteristic of the Milky Way to ultra-low SFRs of 0.0001 M&sun;/yr. We establish that there is a systematic decline of the integrated H-alpha-to-UV flux ratio as less active dwarf galaxies are probed. Thus, if standard linear SFR conversion recipes are applied, the UV yields a greater SFR than H-alpha in this regime. It has been argued that such a systematic may be evidence for a non-universal stellar initial mass function. We discuss this and other possible causes of the observed discrepancy.

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