• techniques: spectroscopic;
  • catalogues;
  • surveys;
  • quasars: emission lines;
  • galaxies: Seyfert;
  • infrared: galaxies


We present the optical spectra of a sample of 34 Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE)-Chandra Deep Field South (CDFS) sources observed with the European Southern Observatory (ESO) Faint Object Spectrograph and Camera (EFOSC2) on the ESO 3.6-m telescope. We have used the spectra and spectroscopic redshifts to validate our photometric redshift codes and spectral energy distribution (SED) template fitting methods. 12 of our sources are infrared luminous galaxies. Of these, five belong to the class of ultraluminous infrared galaxies (ULIRGs) and one to the class of hyperluminous infrared galaxies (HLIRGs), with evidence of both an active galactic nucleus and a starburst component contributing to their extreme infrared luminosity for three, a starburst contributing for one and AGN contributing for two of them.