Testing Star-Formation Rate Indicators and Dust Corrections

Astronomy and Astrophysics – Astronomy

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Scientific paper

We analyze N-body/smoothed-particle hydrodynamics simulations of isolated and merging galaxies, performed using the N-body/smoothed-particle hydrodynamics code Gadget-2 (Springel 2005), with the 3-D adaptive grid, polychromatic Monte Carlo radiative transfer code Sunrise (Jonsson 2006; Jonsson, Cox, and Groves 2009). We apply UV, optical, and IR SFR indicators to the spectral energy distributions of the simulated galaxies in order to characterize the degree of correspondence between the SFR inferred from the indicators and the SFR known in the simulations. The models underlying SFR indicators must necessarily make assumptions about physical properties of the galaxies, e.g., the star formation history (SFH), whereas all such properties are known in the simulations. This benefit of the simulations enables us to test and compare SFR indicators in a way that is complimentary to observational studies. Since the UV and optical indicators suffer from dust attenuation we also investigate methods to correct for dust.

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