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Deep near-infrared spectroscopy of submillimetre-selected galaxies
We present the results of deep near-infrared spectroscopy of sevensubmillimetre-selected galaxies from the Submillimetre Common UserBolometer Array (SCUBA) 8-mJy Survey and Canada-UK Deep SubmillimetreSurvey (CUDSS). These galaxies were selected because they are too faintto be accessible to optical spectrographs on large telescopes. We obtaina spectroscopic redshift for one object, and likely redshifts for twomore, based on a combination of marginal emission-line detections andthe shape of the continuum. All three redshifts broadly agree withestimates from their radio/submm spectral energy distributions. From theemission-line strengths of these objects, we infer star formation ratesof 10-25 Msolar yr-1, while the lack of detectionsin the other objects imply even lower rates. By comparing our resultswith those of other authors, we conclude it is likely that the vastmajority (more than 90 per cent) of the star formation in these objectsis completely extinguished at rest-frame optical wavelengths, and theemission lines originate in a relatively unobscured region. Finally, welook at future prospects for making spectroscopic redshiftdeterminations of submm galaxies.
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