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We present a spectroscopic survey of galaxies in the COSMOS field using theFiber Multi-Object Spectrograph (FMOS), a near-infrared instrument on theSubaru Telescope. Our survey is specifically designed to detect the Halphaemission line that falls within the H-band (1.6-1.8 um) spectroscopic windowfrom star-forming galaxies with 1.4 < z < 1.7 and M_stellar>~10^10 Msolar. Withthe high multiplex capability of FMOS, it is now feasible to construct samplesof over one thousand galaxies having spectroscopic redshifts at epochs thatwere previously challenging. The high-resolution mode (R~2600) effectivelyseparates Halpha and [NII]6585 thus enabling studies of the gas-phasemetallicity and photoionization state of the interstellar medium. The primaryaim of our program is to establish how star formation depends on stellar massand environment, both recognized as drivers of galaxy evolution at lowerredshifts. In addition to the main galaxy sample, our target selection placespriority on those detected in the far-infrared by Herschel/PACS to assess thelevel of obscured star formation and investigate, in detail, outliers from thestar formation rate - stellar mass relation. Galaxies with Halpha detectionsare followed up with FMOS observations at shorter wavelengths using the J-long(1.11-1.35 um) grating to detect Hbeta and [OIII]5008 that provides anassessment of extinction required to measure star formation rates not hamperedby dust, and an indication of embedded Active Galactic Nuclei. With 460redshifts measured from 1153 spectra, we assess the performance of theinstrument with respect to achieving our goals, discuss inherent biases in thesample, and detail the emission-line properties. Our higher-level dataproducts, including catalogs and spectra, are available to the community.

The FMOS-COSMOS survey of star-forming galaxies at z~1.6 III. Survey design, performance, and sample characteristics