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We present the first results from a near-IR spectroscopic survey of theCOSMOS field, using the Fiber Multi-Object Spectrograph on the Subarutelescope, designed to characterize the star-forming galaxy population at$1.4<z<1.7$. The high-resolution mode is implemented to detect H$\alpha$ inemission between $1.6{\rm -}1.8 \mathrm{\mu m}$ with $f_{\rmH\alpha}\gtrsim4\times10^{-17}$ erg cm$^{-2}$ s$^{-1}$. Here, we specificallyfocus on 271 sBzK-selected galaxies that yield a H$\alpha$ detection thusproviding a redshift and emission line luminosity to establish the relationbetween star formation rate and stellar mass. With further $J$-bandspectroscopy for 89 of these, the level of dust extinction is assessed bymeasuring the Balmer decrement using co-added spectra. We find that theextinction ($0.6\lesssim A_\mathrm{H\alpha} \lesssim 2.5$) rises with stellarmass and is elevated at high masses compared to low-redshift galaxies. Usingthis subset of the spectroscopic sample, we further find that the differentialextinction between stellar and nebular emission\hbox{$E_\mathrm{star}(B-V)/E_\mathrm{neb}(B-V)$} is 0.7--0.8, dissimilar tothat typically seen at low redshift. After correcting for extinction, we derivean H$\alpha$-based main sequence with a slope ($0.81\pm0.04$) and normalizationsimilar to previous studies at these redshifts.

The FMOS-COSMOS survey of star-forming galaxies at z ~ 1.6. I. H\alpha -based star formation rates and dust extinction