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Published November 10, 2013 | Submitted + Published + Erratum
Journal Article Open

The FMOS-COSMOS Survey of Star-forming Galaxies at z ~ 1.6. I. Hα-based Star Formation Rates and Dust Extinction


We present the first results from a near-IR spectroscopic survey of the COSMOS field, using the Fiber Multi-Object Spectrograph on the Subaru telescope, designed to characterize the star-forming galaxy population at 1.4 < z < 1.7. The high-resolution mode is implemented to detect Hα in emission between 1.6-1.8 μm with f Hα gsim 4 × 10–17 erg cm–2 s–1. Here, we specifically focus on 271 sBzK-selected galaxies that yield a Hα detection thus providing a redshift and emission line luminosity to establish the relation between star formation rate and stellar mass. With further J-band spectroscopy for 89 of these, the level of dust extinction is assessed by measuring the Balmer decrement using co-added spectra. We find that the extinction (0.6 lsim A Hα lsim 2.5) rises with stellar mass and is elevated at high masses compared to low-redshift galaxies. Using this subset of the spectroscopic sample, we further find that the differential extinction between stellar and nebular emission E star(B – V)/E neb(B – V) is 0.7-0.8, dissimilar to that typically seen at low redshift. After correcting for extinction, we derive an Hα-based main sequence with a slope (0.81 ± 0.04) and normalization similar to previous studies at these redshifts.

Additional Information

© 2013 American Astronomical Society. Received 2013 July 19; accepted 2013 September 16; published 2013 October 11. We would like to thank M. Fukugita, T. Nozawa and V. Wild for useful discussions and K. Aoki, F. Iwamuro, and N. Tamura for their invaluable assistance and expertise regarding Subaru/FMOS. This work has been partially supported by the Grant-in-Aid for the Scientific Research Fund under grant Nos. 22340056: N.S., 23224005: N.A., and Program for Leading Graduate Schools "PhD Professional: Gateway to Success in Frontier Asia" commissioned by the Ministry of Education, Culture, Sports, Science and Technology of Japan, and INAF through the grant "PRIN-2010."

Attached Files

Published - 2041-8205_777_1_L8.pdf

Submitted - 1309.4774v1.pdf

Erratum - 2041-8205_785_2_L37.pdf


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