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We present an analysis of the star-formation rates (SFRs) and dust attenuation properties of star-forming galaxies at 2. 7 z3), it is essential to use a conversion factor between Hα and SFR that accounts for the subsolar metallicity prevalent among distant galaxies. We also use measured Balmer decrements to investigate the relationship between dust attenuation and stellar mass out to z6. The lack of significant redshift evolution in attenuation at fixed stellar mass, previously confirmed using Balmer decrements out to z2. 3, appears to hold out to z 6. 5. Given the rapidly evolving gas, dust, and metal content of star-forming galaxies at fixed mass, this lack of significant evolution in attenuation provides an ongoing challenge to explain.
Shapley et al. (Mon,) studied this question.