paper

The Impact of Inclination-dependent Attenuation on Ultraviolet Star Formation Rate Tracers

arXiv:2204.09580 · doi:10.3847/1538-4357/ac67e8

Abstract

We examine and quantify how hybrid (e.g., UV+IR) star formation rate (SFR) estimators and the - relation depend on inclination for disk-dominated galaxies using spectral energy distribution modeling that utilizes the inclination-dependent attenuation curves described in Doore et al. We perform this analysis on a sample of 133 disk-dominated galaxies from the CANDELS fields and 18 disk galaxies from the Spitzer Infrared Nearby Galaxies Survey and Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel samples. We find that both the hybrid SFR estimators and the - relation present clear dependencies on inclination. To quantify this dependence in the hybrid SFR estimators, we derive an inclination and a far-UV and near-IR color-dependent parametric relation for converting observed UV and IR luminosities into SFRs. For the - relation, we introduce an inclination-dependent component that accounts for the majority of the inclination dependence with the scatter of the relation increasing with inclination. We then compare both of these inclination-dependent relations to similar inclination-independent relations found in the literature. From this comparison, we find that the UV+IR correction factor and for our hybrid and - relations, respectively, result in a reduction in the residual scatter of our sample by approximately a factor of 2. Therefore, we demonstrate that inclination must be considered in hybrid SFR estimators and the - relation to produce more accurate SFR estimates in disk-dominated galaxies.

arXiv comment24 pages, 15 figures. 23 page body and 1 page appendix. Updated with published version

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