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Persistent URL http://purl.org/net/epubs/work/10788328
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Record Id 10788328
Title FMOS near-IR spectroscopy of herschel-selected galaxies: Star formation rates, metallicity and dust attenuation at z   1
Abstract We investigate the properties (e.g. star formation rate, dust attenuation, stellar mass and metallicity) of a sample of infrared (IR) luminous galaxies at z   1 via near-IR spectroscopy with Subaru-FMOS. Our sample consists of Herschel SPIRE and Spitzer MIPS selected sources in the COSMOS field with photometric redshifts in the range of 0.7 < z < 1.8, which have been targeted in two pointings (0.5 deg ) with FMOS. We find a modest success rate for emission-line detections, with candidate H? emission lines detected for 57 of 168 SPIRE sources (34 per cent). By stacking the near-IR spectra we directly measure the mean Balmer decrement for the H? and H? lines, finding a value of ?E(B - V)? = 0.51 ± 0.27 for ?LIR? = 1012 L sources at ?z? = 1.36. By comparing star formation rates estimated from the IR and from the dust-uncorrected Ha line we find a strong relationship between dust attenuation and star formation rate. This relation is broadly consistent with that previously seen in star-forming galaxies at z   0.1. Finally, we investigate the metallicity via the N2 ratio, finding that z   1 IR-selected sources are indistinguishable from the local mass-metallicity relation. We also find a strong correlation between dust attenuation and metallicity, with the most metal-rich IR sources experiencing the largest levels of dust attenuation. © 2012 The Authors, Monthly Notices of the Royal Astronomical Society.
Organisation STFC , RALSP , RALSP - ISD
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Language English (EN)
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Journal Article Mon Notic Roy Astron Soc 426 (2012): 1782-1792. doi:10.1111/j.1365-2966.2012.21777.x 2012