The Rest-frame Optical Spectra of SCUBA Galaxies

Abstract

We present near-infrared spectroscopy and narrow-band imaging at the wavelength of redshifted H-alpha for a sample of 30 high-redshift, far-infrared luminous galaxies. This sample is selected from surveys in the sub-millimeter, millimeter and radio wavebands and has complete redshift coverage with a median redshift of z~2.4. Removing obvious AGN, we find that the predicted H-alpha star formation rates in this diverse population are suppressed (by ~10x) compared to those derived from their far-infrared luminosities. We estimate that AGN are present in at least 40% of the galaxies in our sample. To further investigate this, we construct a composite rest-frame spectrum for both the entire sample and for those galaxies which individually show no signs of nuclear activity. We find [NII]/H-alpha ratios for both composite spectra which suggest that the energy output of the galaxies is star-formation- rather than AGN-dominated. The median H-alpha line width for our sample (removing obvious AGN) is 400+/-70km/s (FWHM), and the typical spatial extent of the H-alpha emission in our narrow-band observations is < 4-8kpc, which indicates a dynamical mass of 1-2 x 10^11 Mo. This estimate is larger than recent estimates of the dynamical masses of UV-selected galaxies at similar redshifts derived in an identical manner. We also compared our H-alpha and far-infrared luminosities with deep Chandra observations of a subset of our survey fields and use these data to further assess their AGN content. We conclude that these high-redshift, far-infrared luminous galaxies represent a population of massive, metal-rich, merging systems with high instantaneous star formation rates, strong dust obscuration and actively-fueled AGN which are likely to be the progenitors of massive local elliptical galaxies. (abridged)

arXiv commentApJ in press. 18 pages, 10 figures

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