The Impact of Inclination-dependent Attenuation on Ultraviolet Star
  Formation Rate Tracers
  We examine and quantify how hybrid (e.g., UV+IR) star formation rate (SFR)
estimators and the $A_{\rm FUV}$-$\beta$ relation (i.e., the Meurer et al. 1999
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. (2021). We perform this analysis
on a sample of 133 disk-dominated galaxies from the CANDELS fields and 18 disk
galaxies from the SINGS and KINGFISH samples. We find that both the hybrid SFR
estimators and the $A_{\rm FUV}$-$\beta$ relation present clear dependencies on
inclination. To quantify this dependence in hybrid SFR estimators, we derive an
inclination and FUV-NIR color dependent parametric relation for converting
observed UV and IR luminosities into SFRs. For the $A_{\rm FUV}$-$\beta$
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 $A_{\rm FUV}$ for our our hybrid and $A_{\rm
FUV}$-$\beta$ relations, respectively, result in a reduction in the residual
scatter of our sample by approximately a factor of two. Therefore, we
demonstrate that inclination must be considered in hybrid SFR estimators and
the $A_{\rm FUV}$-$\beta$ relation to produce more accurate SFR estimates in
disk-dominated galaxies.
